diff --git a/doc/docgen.zig b/doc/docgen.zig
index bec12d98b..d481baf4b 100644
--- a/doc/docgen.zig
+++ b/doc/docgen.zig
@@ -49,7 +49,7 @@ fn gen(in: &io.InStream, out: &io.OutStream) {
             if (err == error.EndOfStream) {
                 return;
             }
-            std.debug.panic("{}", err)
+            std.debug.panic("{}", err);
         };
         switch (state) {
             State.Start => switch (byte) {
diff --git a/doc/langref.html.in b/doc/langref.html.in
index faba4f8b1..162c8b3e0 100644
--- a/doc/langref.html.in
+++ b/doc/langref.html.in
@@ -3021,14 +3021,13 @@ const assert = @import("std").debug.assert;</code></pre>
       <pre><code class="zig">const assert = @import("std").debug.assert;
 
 // Functions are declared like this
-// The last expression in the function can be used as the return value.
 fn add(a: i8, b: i8) -&gt; i8 {
     if (a == 0) {
         // You can still return manually if needed.
         return b;
     }
 
-    a + b
+    return a + b;
 }
 
 // The export specifier makes a function externally visible in the generated
@@ -5847,7 +5846,7 @@ ParamDeclList = "(" list(ParamDecl, ",") ")"
 
 ParamDecl = option("noalias" | "comptime") option(Symbol ":") (TypeExpr | "...")
 
-Block = option(Symbol ":") "{" many(Statement) option(Expression) "}"
+Block = option(Symbol ":") "{" many(Statement) "}"
 
 Statement = LocalVarDecl ";" | Defer(Block) | Defer(Expression) ";" | BlockExpression(Block) | Expression ";" | ";"
 
diff --git a/example/shared_library/mathtest.zig b/example/shared_library/mathtest.zig
index a11642554..bb0175bff 100644
--- a/example/shared_library/mathtest.zig
+++ b/example/shared_library/mathtest.zig
@@ -1,3 +1,3 @@
 export fn add(a: i32, b: i32) -> i32 {
-    a + b
+    return a + b;
 }
diff --git a/src-self-hosted/parser.zig b/src-self-hosted/parser.zig
index b34603f13..c997536ce 100644
--- a/src-self-hosted/parser.zig
+++ b/src-self-hosted/parser.zig
@@ -111,11 +111,11 @@ pub const Parser = struct {
     }
 
     pub fn parse(self: &Parser) -> %&ast.NodeRoot {
-        const result = self.parseInner() %% |err| {
+        const result = self.parseInner() %% |err| x: {
             if (self.cleanup_root_node) |root_node| {
                 self.freeAst(root_node);
             }
-            err
+            break :x err;
         };
         self.cleanup_root_node = null;
         return result;
@@ -125,12 +125,12 @@ pub const Parser = struct {
         var stack = self.initUtilityArrayList(State);
         defer self.deinitUtilityArrayList(stack);
 
-        const root_node = {
+        const root_node = x: {
             const root_node = %return self.createRoot();
             %defer self.allocator.destroy(root_node);
             // This stack append has to succeed for freeAst to work
             %return stack.append(State.TopLevel);
-            root_node
+            break :x root_node;
         };
         assert(self.cleanup_root_node == null);
         self.cleanup_root_node = root_node;
@@ -462,7 +462,7 @@ pub const Parser = struct {
                     } else if (token.id == Token.Id.Keyword_noalias) {
                         param_decl.noalias_token = token;
                         token = self.getNextToken();
-                    };
+                    }
                     if (token.id == Token.Id.Identifier) {
                         const next_token = self.getNextToken();
                         if (next_token.id == Token.Id.Colon) {
@@ -793,14 +793,14 @@ pub const Parser = struct {
     }
 
     fn getNextToken(self: &Parser) -> Token {
-        return if (self.put_back_count != 0) {
+        if (self.put_back_count != 0) {
             const put_back_index = self.put_back_count - 1;
             const put_back_token = self.put_back_tokens[put_back_index];
             self.put_back_count = put_back_index;
-            put_back_token
+            return put_back_token;
         } else {
-            self.tokenizer.next()
-        };
+            return self.tokenizer.next();
+        }
     }
 
     const RenderAstFrame = struct {
@@ -873,7 +873,7 @@ pub const Parser = struct {
                                     Token.Id.Keyword_pub => %return stream.print("pub "),
                                     Token.Id.Keyword_export => %return stream.print("export "),
                                     else => unreachable,
-                                };
+                                }
                             }
                             if (fn_proto.extern_token) |extern_token| {
                                 %return stream.print("{} ", self.tokenizer.getTokenSlice(extern_token));
@@ -1102,7 +1102,7 @@ fn testParse(source: []const u8, allocator: &mem.Allocator) -> %[]u8 {
 // TODO test for memory leaks
 // TODO test for valid frees
 fn testCanonical(source: []const u8) {
-    const needed_alloc_count = {
+    const needed_alloc_count = x: {
         // Try it once with unlimited memory, make sure it works
         var fixed_allocator = mem.FixedBufferAllocator.init(fixed_buffer_mem[0..]);
         var failing_allocator = std.debug.FailingAllocator.init(&fixed_allocator.allocator, @maxValue(usize));
@@ -1116,7 +1116,7 @@ fn testCanonical(source: []const u8) {
             @panic("test failed");
         }
         failing_allocator.allocator.free(result_source);
-        failing_allocator.index
+        break :x failing_allocator.index;
     };
 
     // TODO make this pass
diff --git a/src/all_types.hpp b/src/all_types.hpp
index 87541bb91..a582f561c 100644
--- a/src/all_types.hpp
+++ b/src/all_types.hpp
@@ -26,7 +26,6 @@ struct ScopeFnDef;
 struct TypeTableEntry;
 struct VariableTableEntry;
 struct ErrorTableEntry;
-struct LabelTableEntry;
 struct BuiltinFnEntry;
 struct TypeStructField;
 struct CodeGen;
@@ -54,7 +53,6 @@ struct IrExecutable {
     size_t *backward_branch_count;
     size_t backward_branch_quota;
     bool invalid;
-    ZigList<LabelTableEntry *> all_labels;
     ZigList<IrGotoItem> goto_list;
     bool is_inline;
     FnTableEntry *fn_entry;
@@ -452,7 +450,6 @@ struct AstNodeParamDecl {
 struct AstNodeBlock {
     Buf *name;
     ZigList<AstNode *> statements;
-    bool last_statement_is_result_expression;
 };
 
 enum ReturnKind {
@@ -1644,12 +1641,6 @@ struct ErrorTableEntry {
     ConstExprValue *cached_error_name_val;
 };
 
-struct LabelTableEntry {
-    AstNode *decl_node;
-    IrBasicBlock *bb;
-    bool used;
-};
-
 enum ScopeId {
     ScopeIdDecls,
     ScopeIdBlock,
@@ -1693,7 +1684,12 @@ struct ScopeDecls {
 struct ScopeBlock {
     Scope base;
 
-    HashMap<Buf *, LabelTableEntry *, buf_hash, buf_eql_buf> label_table;
+    Buf *name;
+    IrBasicBlock *end_block;
+    IrInstruction *is_comptime;
+    ZigList<IrInstruction *> *incoming_values;
+    ZigList<IrBasicBlock *> *incoming_blocks;
+
     bool safety_off;
     AstNode *safety_set_node;
     bool fast_math_off;
diff --git a/src/analyze.cpp b/src/analyze.cpp
index 23301cc4d..9ec4db824 100644
--- a/src/analyze.cpp
+++ b/src/analyze.cpp
@@ -110,7 +110,7 @@ ScopeBlock *create_block_scope(AstNode *node, Scope *parent) {
     assert(node->type == NodeTypeBlock);
     ScopeBlock *scope = allocate<ScopeBlock>(1);
     init_scope(&scope->base, ScopeIdBlock, node, parent);
-    scope->label_table.init(1);
+    scope->name = node->data.block.name;
     return scope;
 }
 
diff --git a/src/ast_render.cpp b/src/ast_render.cpp
index e64a19d42..f0912285f 100644
--- a/src/ast_render.cpp
+++ b/src/ast_render.cpp
@@ -478,10 +478,7 @@ static void render_node_extra(AstRender *ar, AstNode *node, bool grouped) {
                 AstNode *statement = node->data.block.statements.at(i);
                 print_indent(ar);
                 render_node_grouped(ar, statement);
-                if (!(i == node->data.block.statements.length - 1 &&
-                      node->data.block.last_statement_is_result_expression)) {
-                    fprintf(ar->f, ";");
-                }
+                fprintf(ar->f, ";");
                 fprintf(ar->f, "\n");
             }
             ar->indent -= ar->indent_size;
diff --git a/src/ir.cpp b/src/ir.cpp
index d3dd58aaf..a0f5a9be4 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -3514,7 +3514,11 @@ static VariableTableEntry *ir_create_var(IrBuilder *irb, AstNode *node, Scope *s
 static IrInstruction *ir_gen_block(IrBuilder *irb, Scope *parent_scope, AstNode *block_node) {
     assert(block_node->type == NodeTypeBlock);
 
+    ZigList<IrInstruction *> incoming_values = {0};
+    ZigList<IrBasicBlock *> incoming_blocks = {0};
+
     ScopeBlock *scope_block = create_block_scope(block_node, parent_scope);
+
     Scope *outer_block_scope = &scope_block->base;
     Scope *child_scope = outer_block_scope;
 
@@ -3528,9 +3532,15 @@ static IrInstruction *ir_gen_block(IrBuilder *irb, Scope *parent_scope, AstNode
         return ir_mark_gen(ir_build_const_void(irb, child_scope, block_node));
     }
 
+    if (block_node->data.block.name != nullptr) {
+        scope_block->incoming_blocks = &incoming_blocks;
+        scope_block->incoming_values = &incoming_values;
+        scope_block->end_block = ir_build_basic_block(irb, parent_scope, "BlockEnd");
+        scope_block->is_comptime = ir_build_const_bool(irb, parent_scope, block_node, ir_should_inline(irb->exec, parent_scope));
+    }
+
     bool is_continuation_unreachable = false;
     IrInstruction *noreturn_return_value = nullptr;
-    IrInstruction *return_value = nullptr;
     for (size_t i = 0; i < block_node->data.block.statements.length; i += 1) {
         AstNode *statement_node = block_node->data.block.statements.at(i);
 
@@ -3548,39 +3558,31 @@ static IrInstruction *ir_gen_block(IrBuilder *irb, Scope *parent_scope, AstNode
             // variable declarations start a new scope
             IrInstructionDeclVar *decl_var_instruction = (IrInstructionDeclVar *)statement_value;
             child_scope = decl_var_instruction->var->child_scope;
-        } else {
-            // label, defer, variable declaration will never be the result expression
-            if (block_node->data.block.last_statement_is_result_expression &&
-                i == block_node->data.block.statements.length - 1) {
-                // this is the result value statement
-                return_value = statement_value;
-            } else {
-                // there are more statements ahead of this one. this statement's value must be void
-                if (statement_value != irb->codegen->invalid_instruction) {
-                    ir_mark_gen(ir_build_check_statement_is_void(irb, child_scope, statement_node, statement_value));
-                }
-            }
+        } else if (statement_value != irb->codegen->invalid_instruction) {
+            // this statement's value must be void
+            ir_mark_gen(ir_build_check_statement_is_void(irb, child_scope, statement_node, statement_value));
         }
     }
 
     if (is_continuation_unreachable) {
         assert(noreturn_return_value != nullptr);
-        return noreturn_return_value;
-    }
-    // control flow falls out of block
-
-    if (block_node->data.block.last_statement_is_result_expression) {
-        // return value was determined by the last statement
-        assert(return_value != nullptr);
+        if (block_node->data.block.name == nullptr || incoming_blocks.length == 0) {
+            return noreturn_return_value;
+        }
     } else {
-        // return value is implicitly void
-        assert(return_value == nullptr);
-        return_value = ir_mark_gen(ir_build_const_void(irb, child_scope, block_node));
+        incoming_blocks.append(irb->current_basic_block);
+        incoming_values.append(ir_mark_gen(ir_build_const_void(irb, parent_scope, block_node)));
     }
 
-    ir_gen_defers_for_block(irb, child_scope, outer_block_scope, false);
-
-    return return_value;
+    if (block_node->data.block.name != nullptr) {
+        ir_gen_defers_for_block(irb, child_scope, outer_block_scope, false);
+        ir_mark_gen(ir_build_br(irb, parent_scope, block_node, scope_block->end_block, scope_block->is_comptime));
+        ir_set_cursor_at_end(irb, scope_block->end_block);
+        return ir_build_phi(irb, parent_scope, block_node, incoming_blocks.length, incoming_blocks.items, incoming_values.items);
+    } else {
+        ir_gen_defers_for_block(irb, child_scope, outer_block_scope, false);
+        return ir_mark_gen(ir_mark_gen(ir_build_const_void(irb, child_scope, block_node)));
+    }
 }
 
 static IrInstruction *ir_gen_bin_op_id(IrBuilder *irb, Scope *scope, AstNode *node, IrBinOp op_id) {
@@ -5952,6 +5954,31 @@ static IrInstruction *ir_gen_comptime(IrBuilder *irb, Scope *parent_scope, AstNo
     return ir_gen_node_extra(irb, node->data.comptime_expr.expr, child_scope, lval);
 }
 
+static IrInstruction *ir_gen_return_from_block(IrBuilder *irb, Scope *break_scope, AstNode *node, ScopeBlock *block_scope) {
+    IrInstruction *is_comptime;
+    if (ir_should_inline(irb->exec, break_scope)) {
+        is_comptime = ir_build_const_bool(irb, break_scope, node, true);
+    } else {
+        is_comptime = block_scope->is_comptime;
+    }
+
+    IrInstruction *result_value;
+    if (node->data.break_expr.expr) {
+        result_value = ir_gen_node(irb, node->data.break_expr.expr, break_scope);
+        if (result_value == irb->codegen->invalid_instruction)
+            return irb->codegen->invalid_instruction;
+    } else {
+        result_value = ir_build_const_void(irb, break_scope, node);
+    }
+
+    IrBasicBlock *dest_block = block_scope->end_block;
+    ir_gen_defers_for_block(irb, break_scope, dest_block->scope, false);
+
+    block_scope->incoming_blocks->append(irb->current_basic_block);
+    block_scope->incoming_values->append(result_value);
+    return ir_build_br(irb, break_scope, node, dest_block, is_comptime);
+}
+
 static IrInstruction *ir_gen_break(IrBuilder *irb, Scope *break_scope, AstNode *node) {
     assert(node->type == NodeTypeBreak);
 
@@ -5959,14 +5986,14 @@ static IrInstruction *ir_gen_break(IrBuilder *irb, Scope *break_scope, AstNode *
     // * function definition scope or global scope => error, break outside loop
     // * defer expression scope => error, cannot break out of defer expression
     // * loop scope => OK
+    // * (if it's a labeled break) labeled block => OK
 
     Scope *search_scope = break_scope;
     ScopeLoop *loop_scope;
-    bool saw_any_loop_scope = false;
     for (;;) {
         if (search_scope == nullptr || search_scope->id == ScopeIdFnDef) {
-            if (saw_any_loop_scope) {
-                add_node_error(irb->codegen, node, buf_sprintf("labeled loop not found: '%s'", buf_ptr(node->data.break_expr.name)));
+            if (node->data.break_expr.name != nullptr) {
+                add_node_error(irb->codegen, node, buf_sprintf("label not found: '%s'", buf_ptr(node->data.break_expr.name)));
                 return irb->codegen->invalid_instruction;
             } else {
                 add_node_error(irb->codegen, node, buf_sprintf("break expression outside loop"));
@@ -5977,13 +6004,20 @@ static IrInstruction *ir_gen_break(IrBuilder *irb, Scope *break_scope, AstNode *
             return irb->codegen->invalid_instruction;
         } else if (search_scope->id == ScopeIdLoop) {
             ScopeLoop *this_loop_scope = (ScopeLoop *)search_scope;
-            saw_any_loop_scope = true;
             if (node->data.break_expr.name == nullptr ||
                 (this_loop_scope->name != nullptr && buf_eql_buf(node->data.break_expr.name, this_loop_scope->name)))
             {
                 loop_scope = this_loop_scope;
                 break;
             }
+        } else if (search_scope->id == ScopeIdBlock) {
+            ScopeBlock *this_block_scope = (ScopeBlock *)search_scope;
+            if (node->data.break_expr.name != nullptr &&
+                (this_block_scope->name != nullptr && buf_eql_buf(node->data.break_expr.name, this_block_scope->name)))
+            {
+                assert(this_block_scope->end_block != nullptr);
+                return ir_gen_return_from_block(irb, break_scope, node, this_block_scope);
+            }
         }
         search_scope = search_scope->parent;
     }
@@ -6022,10 +6056,9 @@ static IrInstruction *ir_gen_continue(IrBuilder *irb, Scope *continue_scope, Ast
 
     Scope *search_scope = continue_scope;
     ScopeLoop *loop_scope;
-    bool saw_any_loop_scope = false;
     for (;;) {
         if (search_scope == nullptr || search_scope->id == ScopeIdFnDef) {
-            if (saw_any_loop_scope) {
+            if (node->data.continue_expr.name != nullptr) {
                 add_node_error(irb->codegen, node, buf_sprintf("labeled loop not found: '%s'", buf_ptr(node->data.continue_expr.name)));
                 return irb->codegen->invalid_instruction;
             } else {
@@ -6037,7 +6070,6 @@ static IrInstruction *ir_gen_continue(IrBuilder *irb, Scope *continue_scope, Ast
             return irb->codegen->invalid_instruction;
         } else if (search_scope->id == ScopeIdLoop) {
             ScopeLoop *this_loop_scope = (ScopeLoop *)search_scope;
-            saw_any_loop_scope = true;
             if (node->data.continue_expr.name == nullptr ||
                 (this_loop_scope->name != nullptr && buf_eql_buf(node->data.continue_expr.name, this_loop_scope->name)))
             {
diff --git a/src/parser.cpp b/src/parser.cpp
index b5fdd681e..d069a23c5 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -748,7 +748,14 @@ static AstNode *ast_parse_primary_expr(ParseContext *pc, size_t *token_index, bo
         node->data.fn_call_expr.is_builtin = true;
 
         return node;
-    } else if (token->id == TokenIdSymbol) {
+    }
+
+    AstNode *block_expr_node = ast_parse_block_expr(pc, token_index, false);
+    if (block_expr_node) {
+        return block_expr_node;
+    }
+
+    if (token->id == TokenIdSymbol) {
         *token_index += 1;
         AstNode *node = ast_create_node(pc, NodeTypeSymbol, token);
         node->data.symbol_expr.symbol = token_buf(token);
@@ -760,11 +767,6 @@ static AstNode *ast_parse_primary_expr(ParseContext *pc, size_t *token_index, bo
         return grouped_expr_node;
     }
 
-    AstNode *block_expr_node = ast_parse_block_expr(pc, token_index, false);
-    if (block_expr_node) {
-        return block_expr_node;
-    }
-
     AstNode *array_type_node = ast_parse_array_type_expr(pc, token_index, false);
     if (array_type_node) {
         return array_type_node;
@@ -2145,9 +2147,6 @@ static AstNode *ast_parse_expression(ParseContext *pc, size_t *token_index, bool
     return nullptr;
 }
 
-/*
-Label: token(Symbol) token(Colon)
-*/
 static bool statement_terminates_without_semicolon(AstNode *node) {
     switch (node->type) {
         case NodeTypeIfBoolExpr:
@@ -2179,7 +2178,7 @@ static bool statement_terminates_without_semicolon(AstNode *node) {
 }
 
 /*
-Block = option(Symbol ":") "{" many(Statement) option(Expression) "}"
+Block = option(Symbol ":") "{" many(Statement) "}"
 Statement = Label | VariableDeclaration ";" | Defer(Block) | Defer(Expression) ";" | BlockExpression(Block) | Expression ";" | ";" | ExportDecl
 */
 static AstNode *ast_parse_block(ParseContext *pc, size_t *token_index, bool mandatory) {
@@ -2220,6 +2219,12 @@ static AstNode *ast_parse_block(ParseContext *pc, size_t *token_index, bool mand
     }
 
     for (;;) {
+        last_token = &pc->tokens->at(*token_index);
+        if (last_token->id == TokenIdRBrace) {
+            *token_index += 1;
+            return node;
+        }
+
         AstNode *statement_node = ast_parse_local_var_decl(pc, token_index);
         if (!statement_node)
             statement_node = ast_parse_defer_expr(pc, token_index);
@@ -2228,32 +2233,14 @@ static AstNode *ast_parse_block(ParseContext *pc, size_t *token_index, bool mand
         if (!statement_node)
             statement_node = ast_parse_expression(pc, token_index, false);
 
-        bool semicolon_expected = true;
-        if (statement_node) {
-            node->data.block.statements.append(statement_node);
-            if (statement_terminates_without_semicolon(statement_node)) {
-                semicolon_expected = false;
-            } else {
-                if (statement_node->type == NodeTypeDefer) {
-                    // defer without a block body requires a semicolon
-                    Token *token = &pc->tokens->at(*token_index);
-                    ast_expect_token(pc, token, TokenIdSemicolon);
-                }
-            }
+        if (!statement_node) {
+            ast_invalid_token_error(pc, last_token);
         }
 
-        node->data.block.last_statement_is_result_expression = statement_node && statement_node->type != NodeTypeDefer;
+        node->data.block.statements.append(statement_node);
 
-        last_token = &pc->tokens->at(*token_index);
-        if (last_token->id == TokenIdRBrace) {
-            *token_index += 1;
-            return node;
-        } else if (!semicolon_expected) {
-            continue;
-        } else if (last_token->id == TokenIdSemicolon) {
-            *token_index += 1;
-        } else {
-            ast_invalid_token_error(pc, last_token);
+        if (!statement_terminates_without_semicolon(statement_node)) {
+            ast_eat_token(pc, token_index, TokenIdSemicolon);
         }
     }
     zig_unreachable();
diff --git a/src/translate_c.cpp b/src/translate_c.cpp
index bb319ccb5..2d0772aea 100644
--- a/src/translate_c.cpp
+++ b/src/translate_c.cpp
@@ -171,6 +171,20 @@ static AstNode * trans_create_node(Context *c, NodeType id) {
     return node;
 }
 
+static AstNode *trans_create_node_break(Context *c, Buf *label_name, AstNode *value_node) {
+    AstNode *node = trans_create_node(c, NodeTypeBreak);
+    node->data.break_expr.name = label_name;
+    node->data.break_expr.expr = value_node;
+    return node;
+}
+
+static AstNode *trans_create_node_return(Context *c, AstNode *value_node) {
+    AstNode *node = trans_create_node(c, NodeTypeReturnExpr);
+    node->data.return_expr.kind = ReturnKindUnconditional;
+    node->data.return_expr.expr = value_node;
+    return node;
+}
+
 static AstNode *trans_create_node_if(Context *c, AstNode *cond_node, AstNode *then_node, AstNode *else_node) {
     AstNode *node = trans_create_node(c, NodeTypeIfBoolExpr);
     node->data.if_bool_expr.condition = cond_node;
@@ -372,8 +386,7 @@ static AstNode *trans_create_node_inline_fn(Context *c, Buf *fn_name, AstNode *r
 
     AstNode *block = trans_create_node(c, NodeTypeBlock);
     block->data.block.statements.resize(1);
-    block->data.block.statements.items[0] = fn_call_node;
-    block->data.block.last_statement_is_result_expression = true;
+    block->data.block.statements.items[0] = trans_create_node_return(c, fn_call_node);
 
     fn_def->data.fn_def.body = block;
     return fn_def;
@@ -1140,13 +1153,15 @@ static AstNode *trans_create_assign(Context *c, ResultUsed result_used, TransSco
     } else {
         // worst case
         // c: lhs = rhs
-        // zig: {
+        // zig: x: {
         // zig:     const _tmp = rhs;
         // zig:     lhs = _tmp;
-        // zig:     _tmp
+        // zig:     break :x _tmp
         // zig: }
 
         TransScopeBlock *child_scope = trans_scope_block_create(c, scope);
+        Buf *label_name = buf_create_from_str("x");
+        child_scope->node->data.block.name = label_name;
 
         // const _tmp = rhs;
         AstNode *rhs_node = trans_expr(c, ResultUsedYes, &child_scope->base, rhs, TransRValue);
@@ -1163,9 +1178,9 @@ static AstNode *trans_create_assign(Context *c, ResultUsed result_used, TransSco
             trans_create_node_bin_op(c, lhs_node, BinOpTypeAssign,
                 trans_create_node_symbol(c, tmp_var_name)));
 
-        // _tmp
-        child_scope->node->data.block.statements.append(trans_create_node_symbol(c, tmp_var_name));
-        child_scope->node->data.block.last_statement_is_result_expression = true;
+        // break :x _tmp
+        AstNode *tmp_symbol_node = trans_create_node_symbol(c, tmp_var_name);
+        child_scope->node->data.block.statements.append(trans_create_node_break(c, label_name, tmp_symbol_node));
 
         return child_scope->node;
     }
@@ -1270,6 +1285,9 @@ static AstNode *trans_binary_operator(Context *c, ResultUsed result_used, TransS
         case BO_Comma:
             {
                 TransScopeBlock *scope_block = trans_scope_block_create(c, scope);
+                Buf *label_name = buf_create_from_str("x");
+                scope_block->node->data.block.name = label_name;
+
                 AstNode *lhs = trans_expr(c, ResultUsedNo, &scope_block->base, stmt->getLHS(), TransRValue);
                 if (lhs == nullptr)
                     return nullptr;
@@ -1278,9 +1296,7 @@ static AstNode *trans_binary_operator(Context *c, ResultUsed result_used, TransS
                 AstNode *rhs = trans_expr(c, result_used, &scope_block->base, stmt->getRHS(), TransRValue);
                 if (rhs == nullptr)
                     return nullptr;
-                scope_block->node->data.block.statements.append(maybe_suppress_result(c, result_used, rhs));
-
-                scope_block->node->data.block.last_statement_is_result_expression = true;
+                scope_block->node->data.block.statements.append(trans_create_node_break(c, label_name, maybe_suppress_result(c, result_used, rhs)));
                 return scope_block->node;
             }
         case BO_MulAssign:
@@ -1320,14 +1336,16 @@ static AstNode *trans_create_compound_assign_shift(Context *c, ResultUsed result
     } else {
         // need more complexity. worst case, this looks like this:
         // c:   lhs >>= rhs
-        // zig: {
+        // zig: x: {
         // zig:     const _ref = &lhs;
         // zig:     *_ref = result_type(operation_type(*_ref) >> u5(rhs));
-        // zig:     *_ref
+        // zig:     break :x *_ref
         // zig: }
         // where u5 is the appropriate type
 
         TransScopeBlock *child_scope = trans_scope_block_create(c, scope);
+        Buf *label_name = buf_create_from_str("x");
+        child_scope->node->data.block.name = label_name;
 
         // const _ref = &lhs;
         AstNode *lhs = trans_expr(c, ResultUsedYes, &child_scope->base, stmt->getLHS(), TransLValue);
@@ -1369,11 +1387,11 @@ static AstNode *trans_create_compound_assign_shift(Context *c, ResultUsed result
         child_scope->node->data.block.statements.append(assign_statement);
 
         if (result_used == ResultUsedYes) {
-            // *_ref
+            // break :x *_ref
             child_scope->node->data.block.statements.append(
-                trans_create_node_prefix_op(c, PrefixOpDereference,
-                    trans_create_node_symbol(c, tmp_var_name)));
-            child_scope->node->data.block.last_statement_is_result_expression = true;
+                trans_create_node_break(c, label_name, 
+                    trans_create_node_prefix_op(c, PrefixOpDereference,
+                        trans_create_node_symbol(c, tmp_var_name))));
         }
 
         return child_scope->node;
@@ -1394,13 +1412,15 @@ static AstNode *trans_create_compound_assign(Context *c, ResultUsed result_used,
     } else {
         // need more complexity. worst case, this looks like this:
         // c:   lhs += rhs
-        // zig: {
+        // zig: x: {
         // zig:     const _ref = &lhs;
         // zig:     *_ref = *_ref + rhs;
-        // zig:     *_ref
+        // zig:     break :x *_ref
         // zig: }
 
         TransScopeBlock *child_scope = trans_scope_block_create(c, scope);
+        Buf *label_name = buf_create_from_str("x");
+        child_scope->node->data.block.name = label_name;
 
         // const _ref = &lhs;
         AstNode *lhs = trans_expr(c, ResultUsedYes, &child_scope->base, stmt->getLHS(), TransLValue);
@@ -1427,11 +1447,11 @@ static AstNode *trans_create_compound_assign(Context *c, ResultUsed result_used,
                 rhs));
         child_scope->node->data.block.statements.append(assign_statement);
 
-        // *_ref
+        // break :x *_ref
         child_scope->node->data.block.statements.append(
-            trans_create_node_prefix_op(c, PrefixOpDereference,
-                trans_create_node_symbol(c, tmp_var_name)));
-        child_scope->node->data.block.last_statement_is_result_expression = true;
+            trans_create_node_break(c, label_name,
+                trans_create_node_prefix_op(c, PrefixOpDereference,
+                    trans_create_node_symbol(c, tmp_var_name))));
 
         return child_scope->node;
     }
@@ -1726,13 +1746,15 @@ static AstNode *trans_create_post_crement(Context *c, ResultUsed result_used, Tr
     }
     // worst case
     // c: expr++
-    // zig: {
+    // zig: x: {
     // zig:     const _ref = &expr;
     // zig:     const _tmp = *_ref;
     // zig:     *_ref += 1;
-    // zig:     _tmp
+    // zig:     break :x _tmp
     // zig: }
     TransScopeBlock *child_scope = trans_scope_block_create(c, scope);
+    Buf *label_name = buf_create_from_str("x");
+    child_scope->node->data.block.name = label_name;
 
     // const _ref = &expr;
     AstNode *expr = trans_expr(c, ResultUsedYes, &child_scope->base, op_expr, TransLValue);
@@ -1758,9 +1780,8 @@ static AstNode *trans_create_post_crement(Context *c, ResultUsed result_used, Tr
         trans_create_node_unsigned(c, 1));
     child_scope->node->data.block.statements.append(assign_statement);
 
-    // _tmp
-    child_scope->node->data.block.statements.append(trans_create_node_symbol(c, tmp_var_name));
-    child_scope->node->data.block.last_statement_is_result_expression = true;
+    // break :x _tmp
+    child_scope->node->data.block.statements.append(trans_create_node_break(c, label_name, trans_create_node_symbol(c, tmp_var_name)));
 
     return child_scope->node;
 }
@@ -1781,12 +1802,14 @@ static AstNode *trans_create_pre_crement(Context *c, ResultUsed result_used, Tra
     }
     // worst case
     // c: ++expr
-    // zig: {
+    // zig: x: {
     // zig:     const _ref = &expr;
     // zig:     *_ref += 1;
-    // zig:     *_ref
+    // zig:     break :x *_ref
     // zig: }
     TransScopeBlock *child_scope = trans_scope_block_create(c, scope);
+    Buf *label_name = buf_create_from_str("x");
+    child_scope->node->data.block.name = label_name;
 
     // const _ref = &expr;
     AstNode *expr = trans_expr(c, ResultUsedYes, &child_scope->base, op_expr, TransLValue);
@@ -1805,11 +1828,10 @@ static AstNode *trans_create_pre_crement(Context *c, ResultUsed result_used, Tra
         trans_create_node_unsigned(c, 1));
     child_scope->node->data.block.statements.append(assign_statement);
 
-    // *_ref
+    // break :x *_ref
     AstNode *deref_expr = trans_create_node_prefix_op(c, PrefixOpDereference,
             trans_create_node_symbol(c, ref_var_name));
-    child_scope->node->data.block.statements.append(deref_expr);
-    child_scope->node->data.block.last_statement_is_result_expression = true;
+    child_scope->node->data.block.statements.append(trans_create_node_break(c, label_name, deref_expr));
 
     return child_scope->node;
 }
diff --git a/std/array_list.zig b/std/array_list.zig
index 5d043075c..04db4dd28 100644
--- a/std/array_list.zig
+++ b/std/array_list.zig
@@ -8,7 +8,7 @@ pub fn ArrayList(comptime T: type) -> type {
 }
 
 pub fn AlignedArrayList(comptime T: type, comptime A: u29) -> type{
-    struct {
+    return struct {
         const Self = this;
 
         /// Use toSlice instead of slicing this directly, because if you don't
@@ -20,11 +20,11 @@ pub fn AlignedArrayList(comptime T: type, comptime A: u29) -> type{
 
         /// Deinitialize with `deinit` or use `toOwnedSlice`.
         pub fn init(allocator: &Allocator) -> Self {
-            Self {
+            return Self {
                 .items = []align(A) T{},
                 .len = 0,
                 .allocator = allocator,
-            }
+            };
         }
 
         pub fn deinit(l: &Self) {
@@ -107,7 +107,7 @@ pub fn AlignedArrayList(comptime T: type, comptime A: u29) -> type{
                 return null;
             return self.pop();
         }
-    }
+    };
 }
 
 test "basic ArrayList test" {
diff --git a/std/buffer.zig b/std/buffer.zig
index 73a38fff5..267d9b635 100644
--- a/std/buffer.zig
+++ b/std/buffer.zig
@@ -30,9 +30,9 @@ pub const Buffer = struct {
     /// * ::replaceContentsBuffer
     /// * ::resize
     pub fn initNull(allocator: &Allocator) -> Buffer {
-        Buffer {
+        return Buffer {
             .list = ArrayList(u8).init(allocator),
-        }
+        };
     }
 
     /// Must deinitialize with deinit.
@@ -120,7 +120,7 @@ pub const Buffer = struct {
     }
 
     pub fn eql(self: &const Buffer, m: []const u8) -> bool {
-        mem.eql(u8, self.toSliceConst(), m)
+        return mem.eql(u8, self.toSliceConst(), m);
     }
 
     pub fn startsWith(self: &const Buffer, m: []const u8) -> bool {
diff --git a/std/build.zig b/std/build.zig
index c1c42a4bc..0a23a77f8 100644
--- a/std/build.zig
+++ b/std/build.zig
@@ -221,11 +221,11 @@ pub const Builder = struct {
     }
 
     pub fn version(self: &const Builder, major: u32, minor: u32, patch: u32) -> Version {
-        Version {
+        return Version {
             .major = major,
             .minor = minor,
             .patch = patch,
-        }
+        };
     }
 
     pub fn addCIncludePath(self: &Builder, path: []const u8) {
@@ -432,16 +432,16 @@ pub const Builder = struct {
         const release_safe = self.option(bool, "release-safe", "optimizations on and safety on") ?? false;
         const release_fast = self.option(bool, "release-fast", "optimizations on and safety off") ?? false;
 
-        const mode = if (release_safe and !release_fast) {
+        const mode = if (release_safe and !release_fast)
             builtin.Mode.ReleaseSafe
-        } else if (release_fast and !release_safe) {
+        else if (release_fast and !release_safe)
             builtin.Mode.ReleaseFast
-        } else if (!release_fast and !release_safe) {
+        else if (!release_fast and !release_safe)
             builtin.Mode.Debug
-        } else {
+        else x: {
             warn("Both -Drelease-safe and -Drelease-fast specified");
             self.markInvalidUserInput();
-            builtin.Mode.Debug
+            break :x builtin.Mode.Debug;
         };
         self.release_mode = mode;
         return mode;
@@ -506,7 +506,7 @@ pub const Builder = struct {
     }
 
     fn typeToEnum(comptime T: type) -> TypeId {
-        switch (@typeId(T)) {
+        return switch (@typeId(T)) {
             builtin.TypeId.Int => TypeId.Int,
             builtin.TypeId.Float => TypeId.Float,
             builtin.TypeId.Bool => TypeId.Bool,
@@ -515,7 +515,7 @@ pub const Builder = struct {
                 []const []const u8 => TypeId.List,
                 else => @compileError("Unsupported type: " ++ @typeName(T)),
             },
-        }
+        };
     }
 
     fn markInvalidUserInput(self: &Builder) {
@@ -590,8 +590,7 @@ pub const Builder = struct {
 
                 return error.UncleanExit;
             },
-        };
-
+        }
     }
 
     pub fn makePath(self: &Builder, path: []const u8) -> %void {
@@ -662,13 +661,12 @@ pub const Builder = struct {
         if (builtin.environ == builtin.Environ.msvc) {
             return "cl.exe";
         } else {
-            return os.getEnvVarOwned(self.allocator, "CC") %% |err| {
-                if (err == error.EnvironmentVariableNotFound) {
+            return os.getEnvVarOwned(self.allocator, "CC") %% |err| 
+                if (err == error.EnvironmentVariableNotFound)
                     ([]const u8)("cc")
-                } else {
-                    debug.panic("Unable to get environment variable: {}", err);
-                }
-            };
+                else
+                    debug.panic("Unable to get environment variable: {}", err)
+            ;
         }
     }
 
@@ -1079,11 +1077,10 @@ pub const LibExeObjStep = struct {
     }
 
     pub fn getOutputPath(self: &LibExeObjStep) -> []const u8 {
-        if (self.output_path) |output_path| {
+        return if (self.output_path) |output_path|
             output_path
-        } else {
-            %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_filename)
-        }
+        else
+            %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_filename);
     }
 
     pub fn setOutputHPath(self: &LibExeObjStep, file_path: []const u8) {
@@ -1096,11 +1093,10 @@ pub const LibExeObjStep = struct {
     }
 
     pub fn getOutputHPath(self: &LibExeObjStep) -> []const u8 {
-        if (self.output_h_path) |output_h_path| {
+        return if (self.output_h_path) |output_h_path|
             output_h_path
-        } else {
-            %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_h_filename)
-        }
+        else
+            %%os.path.join(self.builder.allocator, self.builder.cache_root, self.out_h_filename);
     }
 
     pub fn addAssemblyFile(self: &LibExeObjStep, path: []const u8) {
@@ -1618,7 +1614,7 @@ pub const TestStep = struct {
 
     pub fn init(builder: &Builder, root_src: []const u8) -> TestStep {
         const step_name = builder.fmt("test {}", root_src);
-        TestStep {
+        return TestStep {
             .step = Step.init(step_name, builder.allocator, make),
             .builder = builder,
             .root_src = root_src,
@@ -1629,7 +1625,7 @@ pub const TestStep = struct {
             .link_libs = BufSet.init(builder.allocator),
             .target = Target { .Native = {} },
             .exec_cmd_args = null,
-        }
+        };
     }
 
     pub fn setVerbose(self: &TestStep, value: bool) {
@@ -1936,16 +1932,16 @@ pub const Step = struct {
     done_flag: bool,
 
     pub fn init(name: []const u8, allocator: &Allocator, makeFn: fn (&Step)->%void) -> Step {
-        Step {
+        return Step {
             .name = name,
             .makeFn = makeFn,
             .dependencies = ArrayList(&Step).init(allocator),
             .loop_flag = false,
             .done_flag = false,
-        }
+        };
     }
     pub fn initNoOp(name: []const u8, allocator: &Allocator) -> Step {
-        init(name, allocator, makeNoOp)
+        return init(name, allocator, makeNoOp);
     }
 
     pub fn make(self: &Step) -> %void {
diff --git a/std/cstr.zig b/std/cstr.zig
index e29f90fc0..445f7ab89 100644
--- a/std/cstr.zig
+++ b/std/cstr.zig
@@ -17,7 +17,7 @@ pub fn cmp(a: &const u8, b: &const u8) -> i8 {
         return -1;
     } else {
         return 0;
-    };
+    }
 }
 
 pub fn toSliceConst(str: &const u8) -> []const u8 {
diff --git a/std/debug.zig b/std/debug.zig
index 1035948e3..a683b5ae1 100644
--- a/std/debug.zig
+++ b/std/debug.zig
@@ -32,7 +32,7 @@ fn getStderrStream() -> %&io.OutStream {
         const st = &stderr_file_out_stream.stream;
         stderr_stream = st;
         return st;
-    };
+    }
 }
 
 /// Tries to print a stack trace to stderr, unbuffered, and ignores any error returned.
@@ -52,9 +52,9 @@ pub fn assert(ok: bool) {
         // we insert an explicit call to @panic instead of unreachable.
         // TODO we should use `assertOrPanic` in tests and remove this logic.
         if (builtin.is_test) {
-            @panic("assertion failure")
+            @panic("assertion failure");
         } else {
-            unreachable // assertion failure
+            unreachable; // assertion failure
         }
     }
 }
@@ -175,7 +175,7 @@ pub fn writeStackTrace(out_stream: &io.OutStream, allocator: &mem.Allocator, tty
                             return_address, compile_unit_name);
                     },
                     else => return err,
-                };
+                }
             }
         },
         builtin.ObjectFormat.coff => {
@@ -357,7 +357,7 @@ const Die = struct {
             FormValue.String => |value| value,
             FormValue.StrPtr => |offset| getString(st, offset),
             else => error.InvalidDebugInfo,
-        }
+        };
     }
 };
 
@@ -403,7 +403,7 @@ const LineNumberProgram = struct {
     pub fn init(is_stmt: bool, include_dirs: []const []const u8,
         file_entries: &ArrayList(FileEntry), target_address: usize) -> LineNumberProgram
     {
-        LineNumberProgram {
+        return LineNumberProgram {
             .address = 0,
             .file = 1,
             .line = 1,
@@ -421,7 +421,7 @@ const LineNumberProgram = struct {
             .prev_is_stmt = undefined,
             .prev_basic_block = undefined,
             .prev_end_sequence = undefined,
-        }
+        };
     }
 
     pub fn checkLineMatch(self: &LineNumberProgram) -> %?LineInfo {
@@ -430,14 +430,11 @@ const LineNumberProgram = struct {
                 return error.MissingDebugInfo;
             } else if (self.prev_file - 1 >= self.file_entries.len) {
                 return error.InvalidDebugInfo;
-            } else {
-                &self.file_entries.items[self.prev_file - 1]
-            };
+            } else &self.file_entries.items[self.prev_file - 1];
+
             const dir_name = if (file_entry.dir_index >= self.include_dirs.len) {
                 return error.InvalidDebugInfo;
-            } else {
-                self.include_dirs[file_entry.dir_index]
-            };
+            } else self.include_dirs[file_entry.dir_index];
             const file_name = %return os.path.join(self.file_entries.allocator, dir_name, file_entry.file_name);
             %defer self.file_entries.allocator.free(file_name);
             return LineInfo {
@@ -494,28 +491,21 @@ fn parseFormValueBlock(allocator: &mem.Allocator, in_stream: &io.InStream, size:
 }
 
 fn parseFormValueConstant(allocator: &mem.Allocator, in_stream: &io.InStream, signed: bool, size: usize) -> %FormValue {
-    FormValue { .Const = Constant {
+    return FormValue { .Const = Constant {
         .signed = signed,
         .payload = %return readAllocBytes(allocator, in_stream, size),
-    }}
+    }};
 }
 
 fn parseFormValueDwarfOffsetSize(in_stream: &io.InStream, is_64: bool) -> %u64 {
-    return if (is_64) {
-        %return in_stream.readIntLe(u64)
-    } else {
-        u64(%return in_stream.readIntLe(u32))
-    };
+    return if (is_64) %return in_stream.readIntLe(u64)
+    else u64(%return in_stream.readIntLe(u32)) ;
 }
 
 fn parseFormValueTargetAddrSize(in_stream: &io.InStream) -> %u64 {
-    return if (@sizeOf(usize) == 4) {
-        u64(%return in_stream.readIntLe(u32))
-    } else if (@sizeOf(usize) == 8) {
-        %return in_stream.readIntLe(u64)
-    } else {
-        unreachable;
-    };
+    return if (@sizeOf(usize) == 4) u64(%return in_stream.readIntLe(u32))
+    else if (@sizeOf(usize) == 8) %return in_stream.readIntLe(u64)
+    else unreachable;
 }
 
 fn parseFormValueRefLen(allocator: &mem.Allocator, in_stream: &io.InStream, size: usize) -> %FormValue {
@@ -534,9 +524,9 @@ fn parseFormValue(allocator: &mem.Allocator, in_stream: &io.InStream, form_id: u
         DW.FORM_block1 => parseFormValueBlock(allocator, in_stream, 1),
         DW.FORM_block2 => parseFormValueBlock(allocator, in_stream, 2),
         DW.FORM_block4 => parseFormValueBlock(allocator, in_stream, 4),
-        DW.FORM_block => {
+        DW.FORM_block => x: {
             const block_len = %return readULeb128(in_stream);
-            parseFormValueBlockLen(allocator, in_stream, block_len)
+            return parseFormValueBlockLen(allocator, in_stream, block_len);
         },
         DW.FORM_data1 => parseFormValueConstant(allocator, in_stream, false, 1),
         DW.FORM_data2 => parseFormValueConstant(allocator, in_stream, false, 2),
@@ -545,7 +535,7 @@ fn parseFormValue(allocator: &mem.Allocator, in_stream: &io.InStream, form_id: u
         DW.FORM_udata, DW.FORM_sdata => {
             const block_len = %return readULeb128(in_stream);
             const signed = form_id == DW.FORM_sdata;
-            parseFormValueConstant(allocator, in_stream, signed, block_len)
+            return parseFormValueConstant(allocator, in_stream, signed, block_len);
         },
         DW.FORM_exprloc => {
             const size = %return readULeb128(in_stream);
@@ -562,7 +552,7 @@ fn parseFormValue(allocator: &mem.Allocator, in_stream: &io.InStream, form_id: u
         DW.FORM_ref8 => parseFormValueRef(allocator, in_stream, u64),
         DW.FORM_ref_udata => {
             const ref_len = %return readULeb128(in_stream);
-            parseFormValueRefLen(allocator, in_stream, ref_len)
+            return parseFormValueRefLen(allocator, in_stream, ref_len);
         },
 
         DW.FORM_ref_addr => FormValue { .RefAddr = %return parseFormValueDwarfOffsetSize(in_stream, is_64) },
@@ -572,10 +562,10 @@ fn parseFormValue(allocator: &mem.Allocator, in_stream: &io.InStream, form_id: u
         DW.FORM_strp => FormValue { .StrPtr = %return parseFormValueDwarfOffsetSize(in_stream, is_64) },
         DW.FORM_indirect => {
             const child_form_id = %return readULeb128(in_stream);
-            parseFormValue(allocator, in_stream, child_form_id, is_64)
+            return parseFormValue(allocator, in_stream, child_form_id, is_64);
         },
         else => error.InvalidDebugInfo,
-    }
+    };
 }
 
 fn parseAbbrevTable(st: &ElfStackTrace) -> %AbbrevTable {
@@ -852,11 +842,9 @@ fn scanAllCompileUnits(st: &ElfStackTrace) -> %void {
         const version = %return in_stream.readInt(st.elf.endian, u16);
         if (version < 2 or version > 5) return error.InvalidDebugInfo;
 
-        const debug_abbrev_offset = if (is_64) {
-            %return in_stream.readInt(st.elf.endian, u64)
-        } else {
-            %return in_stream.readInt(st.elf.endian, u32)
-        };
+        const debug_abbrev_offset =
+            if (is_64) %return in_stream.readInt(st.elf.endian, u64)
+            else %return in_stream.readInt(st.elf.endian, u32);
 
         const address_size = %return in_stream.readByte();
         if (address_size != @sizeOf(usize)) return error.InvalidDebugInfo;
@@ -872,28 +860,28 @@ fn scanAllCompileUnits(st: &ElfStackTrace) -> %void {
         if (compile_unit_die.tag_id != DW.TAG_compile_unit)
             return error.InvalidDebugInfo;
 
-        const pc_range = {
+        const pc_range = x: {
             if (compile_unit_die.getAttrAddr(DW.AT_low_pc)) |low_pc| {
                 if (compile_unit_die.getAttr(DW.AT_high_pc)) |high_pc_value| {
                     const pc_end = switch (*high_pc_value) {
                         FormValue.Address => |value| value,
-                        FormValue.Const => |value| {
+                        FormValue.Const => |value| b: {
                             const offset = %return value.asUnsignedLe();
-                            low_pc + offset
+                            break :b (low_pc + offset);
                         },
                         else => return error.InvalidDebugInfo,
                     };
-                    PcRange {
+                    break :x PcRange {
                         .start = low_pc,
                         .end = pc_end,
-                    }
+                    };
                 } else {
-                    null
+                    break :x null;
                 }
             } else |err| {
                 if (err != error.MissingDebugInfo)
                     return err;
-                null
+                break :x null;
             }
         };
 
@@ -949,12 +937,12 @@ fn findCompileUnit(st: &ElfStackTrace, target_address: u64) -> %&const CompileUn
 fn readInitialLength(in_stream: &io.InStream, is_64: &bool) -> %u64 {
     const first_32_bits = %return in_stream.readIntLe(u32);
     *is_64 = (first_32_bits == 0xffffffff);
-    return if (*is_64) {
-        %return in_stream.readIntLe(u64)
+    if (*is_64) {
+        return in_stream.readIntLe(u64);
     } else {
         if (first_32_bits >= 0xfffffff0) return error.InvalidDebugInfo;
-        u64(first_32_bits)
-    };
+        return u64(first_32_bits);
+    }
 }
 
 fn readULeb128(in_stream: &io.InStream) -> %u64 {
diff --git a/std/endian.zig b/std/endian.zig
index 2dc6b8d34..9f2d2c8dc 100644
--- a/std/endian.zig
+++ b/std/endian.zig
@@ -2,15 +2,15 @@ const mem = @import("mem.zig");
 const builtin = @import("builtin");
 
 pub fn swapIfLe(comptime T: type, x: T) -> T {
-    swapIf(false, T, x)
+    return swapIf(false, T, x);
 }
 
 pub fn swapIfBe(comptime T: type, x: T) -> T {
-    swapIf(true, T, x)
+    return swapIf(true, T, x);
 }
 
 pub fn swapIf(endian: builtin.Endian, comptime T: type, x: T) -> T {
-    if (builtin.endian == endian) swap(T, x) else x
+    return if (builtin.endian == endian) swap(T, x) else x;
 }
 
 pub fn swap(comptime T: type, x: T) -> T {
diff --git a/std/fmt/errol/enum3.zig b/std/fmt/errol/enum3.zig
index 93861cce7..feb84da9a 100644
--- a/std/fmt/errol/enum3.zig
+++ b/std/fmt/errol/enum3.zig
@@ -439,10 +439,10 @@ const Slab = struct {
 };
 
 fn slab(str: []const u8, exp: i32) -> Slab {
-    Slab {
+    return Slab {
         .str = str,
         .exp = exp,
-    }
+    };
 }
 
 pub const enum3_data = []Slab {
diff --git a/std/fmt/index.zig b/std/fmt/index.zig
index 59376e045..53fd08548 100644
--- a/std/fmt/index.zig
+++ b/std/fmt/index.zig
@@ -251,11 +251,10 @@ pub fn formatFloat(value: var, context: var, output: fn(@typeOf(context), []cons
     %return output(context, float_decimal.digits[0..1]);
     %return output(context, ".");
     if (float_decimal.digits.len > 1) {
-        const num_digits = if (@typeOf(value) == f32) {
+        const num_digits = if (@typeOf(value) == f32)
             math.min(usize(9), float_decimal.digits.len)
-        } else {
-            float_decimal.digits.len
-        };
+        else
+            float_decimal.digits.len;
         %return output(context, float_decimal.digits[1 .. num_digits]);
     } else {
         %return output(context, "0");
diff --git a/std/hash_map.zig b/std/hash_map.zig
index d124d7b57..837ee0742 100644
--- a/std/hash_map.zig
+++ b/std/hash_map.zig
@@ -12,7 +12,7 @@ pub fn HashMap(comptime K: type, comptime V: type,
     comptime hash: fn(key: K)->u32,
     comptime eql: fn(a: K, b: K)->bool) -> type
 {
-    struct {
+    return struct {
         entries: []Entry,
         size: usize,
         max_distance_from_start_index: usize,
@@ -51,19 +51,19 @@ pub fn HashMap(comptime K: type, comptime V: type,
                         return entry;
                     }
                 }
-                unreachable // no next item
+                unreachable; // no next item
             }
         };
 
         pub fn init(allocator: &Allocator) -> Self {
-            Self {
+            return Self {
                 .entries = []Entry{},
                 .allocator = allocator,
                 .size = 0,
                 .max_distance_from_start_index = 0,
                 // it doesn't actually matter what we set this to since we use wrapping integer arithmetic
                 .modification_count = undefined,
-            }
+            };
         }
 
         pub fn deinit(hm: &Self) {
@@ -133,7 +133,7 @@ pub fn HashMap(comptime K: type, comptime V: type,
                     entry.distance_from_start_index -= 1;
                     entry = next_entry;
                 }
-                unreachable // shifting everything in the table
+                unreachable; // shifting everything in the table
             }}
             return null;
         }
@@ -169,7 +169,7 @@ pub fn HashMap(comptime K: type, comptime V: type,
             const start_index = hm.keyToIndex(key);
             var roll_over: usize = 0;
             var distance_from_start_index: usize = 0;
-            while (roll_over < hm.entries.len) : ({roll_over += 1; distance_from_start_index += 1}) {
+            while (roll_over < hm.entries.len) : ({roll_over += 1; distance_from_start_index += 1;}) {
                 const index = (start_index + roll_over) % hm.entries.len;
                 const entry = &hm.entries[index];
 
@@ -210,7 +210,7 @@ pub fn HashMap(comptime K: type, comptime V: type,
                 };
                 return result;
             }
-            unreachable // put into a full map
+            unreachable; // put into a full map
         }
 
         fn internalGet(hm: &Self, key: K) -> ?&Entry {
@@ -228,7 +228,7 @@ pub fn HashMap(comptime K: type, comptime V: type,
         fn keyToIndex(hm: &Self, key: K) -> usize {
             return usize(hash(key)) % hm.entries.len;
         }
-    }
+    };
 }
 
 test "basicHashMapTest" {
@@ -251,9 +251,9 @@ test "basicHashMapTest" {
 }
 
 fn hash_i32(x: i32) -> u32 {
-    @bitCast(u32, x)
+    return @bitCast(u32, x);
 }
 
 fn eql_i32(a: i32, b: i32) -> bool {
-    a == b
+    return a == b;
 }
diff --git a/std/heap.zig b/std/heap.zig
index d54d92185..605eddb40 100644
--- a/std/heap.zig
+++ b/std/heap.zig
@@ -17,22 +17,21 @@ pub var c_allocator = Allocator {
 };
 
 fn cAlloc(self: &Allocator, n: usize, alignment: u29) -> %[]u8 {
-    if (c.malloc(usize(n))) |buf| {
+    return if (c.malloc(usize(n))) |buf|
         @ptrCast(&u8, buf)[0..n]
-    } else {
-        error.OutOfMemory
-    }
+    else
+        error.OutOfMemory;
 }
 
 fn cRealloc(self: &Allocator, old_mem: []u8, new_size: usize, alignment: u29) -> %[]u8 {
     if (new_size <= old_mem.len) {
-        old_mem[0..new_size]
+        return old_mem[0..new_size];
     } else {
         const old_ptr = @ptrCast(&c_void, old_mem.ptr);
         if (c.realloc(old_ptr, usize(new_size))) |buf| {
-            @ptrCast(&u8, buf)[0..new_size]
+            return @ptrCast(&u8, buf)[0..new_size];
         } else {
-            error.OutOfMemory
+            return error.OutOfMemory;
         }
     }
 }
diff --git a/std/io.zig b/std/io.zig
index 0ba3d06a0..cbf2e0c21 100644
--- a/std/io.zig
+++ b/std/io.zig
@@ -50,35 +50,32 @@ error Unseekable;
 error EndOfFile;
 
 pub fn getStdErr() -> %File {
-    const handle = if (is_windows) {
+    const handle = if (is_windows)
         %return os.windowsGetStdHandle(system.STD_ERROR_HANDLE)
-    } else if (is_posix) {
+    else if (is_posix)
         system.STDERR_FILENO
-    } else {
-        unreachable
-    };
+    else
+        unreachable;
     return File.openHandle(handle);
 }
 
 pub fn getStdOut() -> %File {
-    const handle = if (is_windows) {
+    const handle = if (is_windows)
         %return os.windowsGetStdHandle(system.STD_OUTPUT_HANDLE)
-    } else if (is_posix) {
+    else if (is_posix)
         system.STDOUT_FILENO
-    } else {
-        unreachable
-    };
+    else
+        unreachable;
     return File.openHandle(handle);
 }
 
 pub fn getStdIn() -> %File {
-    const handle = if (is_windows) {
+    const handle = if (is_windows)
         %return os.windowsGetStdHandle(system.STD_INPUT_HANDLE)
-    } else if (is_posix) {
+    else if (is_posix)
         system.STDIN_FILENO
-    } else {
-        unreachable
-    };
+    else
+        unreachable;
     return File.openHandle(handle);
 }
 
@@ -261,7 +258,7 @@ pub const File = struct {
                     system.EBADF => error.BadFd,
                     system.ENOMEM => error.SystemResources,
                     else => os.unexpectedErrorPosix(err),
-                }
+                };
             }
 
             return usize(stat.size);
diff --git a/std/linked_list.zig b/std/linked_list.zig
index cbcef793d..f4b6d274c 100644
--- a/std/linked_list.zig
+++ b/std/linked_list.zig
@@ -5,7 +5,7 @@ const Allocator = mem.Allocator;
 
 /// Generic doubly linked list.
 pub fn LinkedList(comptime T: type) -> type {
-    struct {
+    return struct {
         const Self = this;
 
         /// Node inside the linked list wrapping the actual data.
@@ -15,11 +15,11 @@ pub fn LinkedList(comptime T: type) -> type {
             data: T,
 
             pub fn init(data: &const T) -> Node {
-                Node {
+                return Node {
                     .prev = null,
                     .next = null,
                     .data = *data,
-                }
+                };
             }
         };
 
@@ -32,11 +32,11 @@ pub fn LinkedList(comptime T: type) -> type {
         /// Returns:
         ///     An empty linked list.
         pub fn init() -> Self {
-            Self {
+            return Self {
                 .first = null,
                 .last  = null,
                 .len   = 0,
-            }
+            };
         }
 
         /// Insert a new node after an existing one.
@@ -166,7 +166,7 @@ pub fn LinkedList(comptime T: type) -> type {
         /// Returns:
         ///     A pointer to the new node.
         pub fn allocateNode(list: &Self, allocator: &Allocator) -> %&Node {
-            allocator.create(Node)
+            return allocator.create(Node);
         }
 
         /// Deallocate a node.
@@ -191,7 +191,7 @@ pub fn LinkedList(comptime T: type) -> type {
             *node = Node.init(data);
             return node;
         }
-    }
+    };
 }
 
 test "basic linked list test" {
diff --git a/std/math/acos.zig b/std/math/acos.zig
index 941643db8..ae7afce03 100644
--- a/std/math/acos.zig
+++ b/std/math/acos.zig
@@ -7,11 +7,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn acos(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(acos32, x),
         f64 => @inlineCall(acos64, x),
         else => @compileError("acos not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn r32(z: f32) -> f32 {
@@ -22,7 +22,7 @@ fn r32(z: f32) -> f32 {
 
     const p = z * (pS0 + z * (pS1 + z * pS2));
     const q = 1.0 + z * qS1;
-    p / q
+    return p / q;
 }
 
 fn acos32(x: f32) -> f32 {
@@ -69,7 +69,7 @@ fn acos32(x: f32) -> f32 {
     const df = @bitCast(f32, jx & 0xFFFFF000);
     const c = (z - df * df) / (s + df);
     const w = r32(z) * s + c;
-    2 * (df + w)
+    return 2 * (df + w);
 }
 
 fn r64(z: f64) -> f64 {
@@ -86,7 +86,7 @@ fn r64(z: f64) -> f64 {
 
     const p = z * (pS0 + z * (pS1 + z * (pS2 + z * (pS3 + z * (pS4 + z * pS5)))));
     const q = 1.0 + z * (qS1 + z * (qS2 + z * (qS3 + z * qS4)));
-    p / q
+    return p / q;
 }
 
 fn acos64(x: f64) -> f64 {
@@ -138,7 +138,7 @@ fn acos64(x: f64) -> f64 {
     const df = @bitCast(f64, jx & 0xFFFFFFFF00000000);
     const c = (z - df * df) / (s + df);
     const w = r64(z) * s + c;
-    2 * (df + w)
+    return 2 * (df + w);
 }
 
 test "math.acos" {
diff --git a/std/math/acosh.zig b/std/math/acosh.zig
index 9f43edeb5..0fdf9e41e 100644
--- a/std/math/acosh.zig
+++ b/std/math/acosh.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn acosh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(acosh32, x),
         f64 => @inlineCall(acosh64, x),
         else => @compileError("acosh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // acosh(x) = log(x + sqrt(x * x - 1))
@@ -23,15 +23,15 @@ fn acosh32(x: f32) -> f32 {
 
     // |x| < 2, invalid if x < 1 or nan
     if (i < 0x3F800000 + (1 << 23)) {
-        math.log1p(x - 1 + math.sqrt((x - 1) * (x - 1) + 2 * (x - 1)))
+        return math.log1p(x - 1 + math.sqrt((x - 1) * (x - 1) + 2 * (x - 1)));
     }
     // |x| < 0x1p12
     else if (i < 0x3F800000 + (12 << 23)) {
-        math.ln(2 * x - 1 / (x + math.sqrt(x * x - 1)))
+        return math.ln(2 * x - 1 / (x + math.sqrt(x * x - 1)));
     }
     // |x| >= 0x1p12
     else {
-        math.ln(x) + 0.693147180559945309417232121458176568
+        return math.ln(x) + 0.693147180559945309417232121458176568;
     }
 }
 
@@ -41,15 +41,15 @@ fn acosh64(x: f64) -> f64 {
 
     // |x| < 2, invalid if x < 1 or nan
     if (e < 0x3FF + 1) {
-        math.log1p(x - 1 + math.sqrt((x - 1) * (x - 1) + 2 * (x - 1)))
+        return math.log1p(x - 1 + math.sqrt((x - 1) * (x - 1) + 2 * (x - 1)));
     }
     // |x| < 0x1p26
     else if (e < 0x3FF + 26) {
-        math.ln(2 * x - 1 / (x + math.sqrt(x * x - 1)))
+        return math.ln(2 * x - 1 / (x + math.sqrt(x * x - 1)));
     }
     // |x| >= 0x1p26 or nan
     else {
-        math.ln(x) + 0.693147180559945309417232121458176568
+        return math.ln(x) + 0.693147180559945309417232121458176568;
     }
 }
 
diff --git a/std/math/asin.zig b/std/math/asin.zig
index b0368b5d6..11aad0410 100644
--- a/std/math/asin.zig
+++ b/std/math/asin.zig
@@ -8,11 +8,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn asin(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(asin32, x),
         f64 => @inlineCall(asin64, x),
         else => @compileError("asin not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn r32(z: f32) -> f32 {
@@ -23,7 +23,7 @@ fn r32(z: f32) -> f32 {
 
     const p = z * (pS0 + z * (pS1 + z * pS2));
     const q = 1.0 + z * qS1;
-    p / q
+    return p / q;
 }
 
 fn asin32(x: f32) -> f32 {
@@ -58,9 +58,9 @@ fn asin32(x: f32) -> f32 {
     const fx = pio2 - 2 * (s + s * r32(z));
 
     if (hx >> 31 != 0) {
-        -fx
+        return -fx;
     } else {
-        fx
+        return fx;
     }
 }
 
@@ -78,7 +78,7 @@ fn r64(z: f64) -> f64 {
 
     const p = z * (pS0 + z * (pS1 + z * (pS2 + z * (pS3 + z * (pS4 + z * pS5)))));
     const q = 1.0 + z * (qS1 + z * (qS2 + z * (qS3 + z * qS4)));
-    p / q
+    return p / q;
 }
 
 fn asin64(x: f64) -> f64 {
@@ -119,7 +119,7 @@ fn asin64(x: f64) -> f64 {
 
     // |x| > 0.975
     if (ix >= 0x3FEF3333) {
-        fx = pio2_hi - 2 * (s + s * r)
+        fx = pio2_hi - 2 * (s + s * r);
     } else {
         const jx = @bitCast(u64, s);
         const df = @bitCast(f64, jx & 0xFFFFFFFF00000000);
@@ -128,9 +128,9 @@ fn asin64(x: f64) -> f64 {
     }
 
     if (hx >> 31 != 0) {
-        -fx
+        return -fx;
     } else {
-        fx
+        return fx;
     }
 }
 
diff --git a/std/math/asinh.zig b/std/math/asinh.zig
index dab047036..eda7e1586 100644
--- a/std/math/asinh.zig
+++ b/std/math/asinh.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn asinh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(asinh32, x),
         f64 => @inlineCall(asinh64, x),
         else => @compileError("asinh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // asinh(x) = sign(x) * log(|x| + sqrt(x * x + 1)) ~= x - x^3/6 + o(x^5)
@@ -46,7 +46,7 @@ fn asinh32(x: f32) -> f32 {
         math.forceEval(x + 0x1.0p120);
     }
 
-    if (s != 0) -rx else rx
+    return if (s != 0) -rx else rx;
 }
 
 fn asinh64(x: f64) -> f64 {
@@ -77,7 +77,7 @@ fn asinh64(x: f64) -> f64 {
         math.forceEval(x + 0x1.0p120);
     }
 
-    if (s != 0) -rx else rx
+    return if (s != 0) -rx else rx;
 }
 
 test "math.asinh" {
diff --git a/std/math/atan.zig b/std/math/atan.zig
index 5f3e20796..4527f6bf2 100644
--- a/std/math/atan.zig
+++ b/std/math/atan.zig
@@ -8,11 +8,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn atan(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(atan32, x),
         f64 => @inlineCall(atan64, x),
         else => @compileError("atan not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn atan32(x_: f32) -> f32 {
@@ -100,10 +100,10 @@ fn atan32(x_: f32) -> f32 {
     const s2 = w * (aT[1] + w * aT[3]);
 
     if (id == null) {
-        x - x * (s1 + s2)
+        return x - x * (s1 + s2);
     } else {
         const zz = atanhi[??id] - ((x * (s1 + s2) - atanlo[??id]) - x);
-        if (sign != 0) -zz else zz
+        return if (sign != 0) -zz else zz;
     }
 }
 
@@ -199,10 +199,10 @@ fn atan64(x_: f64) -> f64 {
     const s2 = w * (aT[1] + w * (aT[3] + w * (aT[5] + w * (aT[7] + w * aT[9]))));
 
     if (id == null) {
-        x - x * (s1 + s2)
+        return x - x * (s1 + s2);
     } else {
         const zz = atanhi[??id] - ((x * (s1 + s2) - atanlo[??id]) - x);
-        if (sign != 0) -zz else zz
+        return if (sign != 0) -zz else zz;
     }
 }
 
diff --git a/std/math/atan2.zig b/std/math/atan2.zig
index 0e566837c..9124952b7 100644
--- a/std/math/atan2.zig
+++ b/std/math/atan2.zig
@@ -22,11 +22,11 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 fn atan2(comptime T: type, x: T, y: T) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(atan2_32, x, y),
         f64 => @inlineCall(atan2_64, x, y),
         else => @compileError("atan2 not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn atan2_32(y: f32, x: f32) -> f32 {
@@ -97,11 +97,11 @@ fn atan2_32(y: f32, x: f32) -> f32 {
     }
 
     // z = atan(|y / x|) with correct underflow
-    var z = {
+    var z = z: {
         if ((m & 2) != 0 and iy + (26 << 23) < ix) {
-            0.0
+            break :z 0.0;
         } else {
-            math.atan(math.fabs(y / x))
+            break :z math.atan(math.fabs(y / x));
         }
     };
 
@@ -187,11 +187,11 @@ fn atan2_64(y: f64, x: f64) -> f64 {
     }
 
     // z = atan(|y / x|) with correct underflow
-    var z = {
+    var z = z: {
         if ((m & 2) != 0 and iy +% (64 << 20) < ix) {
-            0.0
+            break :z 0.0;
         } else {
-            math.atan(math.fabs(y / x))
+            break :z math.atan(math.fabs(y / x));
         }
     };
 
diff --git a/std/math/atanh.zig b/std/math/atanh.zig
index 8fe5ab55a..2f87efbbd 100644
--- a/std/math/atanh.zig
+++ b/std/math/atanh.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn atanh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(atanh_32, x),
         f64 => @inlineCall(atanh_64, x),
         else => @compileError("atanh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // atanh(x) = log((1 + x) / (1 - x)) / 2 = log1p(2x / (1 - x)) / 2 ~= x + x^3 / 3 + o(x^5)
@@ -32,7 +32,7 @@ fn atanh_32(x: f32) -> f32 {
         if (u < 0x3F800000 - (32 << 23)) {
             // underflow
             if (u < (1 << 23)) {
-                math.forceEval(y * y)
+                math.forceEval(y * y);
             }
         }
         // |x| < 0.5
@@ -43,7 +43,7 @@ fn atanh_32(x: f32) -> f32 {
         y = 0.5 * math.log1p(2 * (y / (1 - y)));
     }
 
-    if (s != 0) -y else y
+    return if (s != 0) -y else y;
 }
 
 fn atanh_64(x: f64) -> f64 {
@@ -72,7 +72,7 @@ fn atanh_64(x: f64) -> f64 {
         y = 0.5 * math.log1p(2 * (y / (1 - y)));
     }
 
-    if (s != 0) -y else y
+    return if (s != 0) -y else y;
 }
 
 test "math.atanh" {
diff --git a/std/math/cbrt.zig b/std/math/cbrt.zig
index 273939c6b..ff353655b 100644
--- a/std/math/cbrt.zig
+++ b/std/math/cbrt.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn cbrt(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(cbrt32, x),
         f64 => @inlineCall(cbrt64, x),
         else => @compileError("cbrt not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn cbrt32(x: f32) -> f32 {
@@ -53,7 +53,7 @@ fn cbrt32(x: f32) -> f32 {
     r = t * t * t;
     t = t * (f64(x) + x + r) / (x + r + r);
 
-    f32(t)
+    return f32(t);
 }
 
 fn cbrt64(x: f64) -> f64 {
@@ -109,7 +109,7 @@ fn cbrt64(x: f64) -> f64 {
     var w = t + t;
     q = (q - t) / (w + q);
 
-    t + t * q
+    return t + t * q;
 }
 
 test "math.cbrt" {
diff --git a/std/math/ceil.zig b/std/math/ceil.zig
index 2c7b28cc9..a8db486f9 100644
--- a/std/math/ceil.zig
+++ b/std/math/ceil.zig
@@ -10,11 +10,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn ceil(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(ceil32, x),
         f64 => @inlineCall(ceil64, x),
         else => @compileError("ceil not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn ceil32(x: f32) -> f32 {
@@ -39,13 +39,13 @@ fn ceil32(x: f32) -> f32 {
             u += m;
         }
         u &= ~m;
-        @bitCast(f32, u)
+        return @bitCast(f32, u);
     } else {
         math.forceEval(x + 0x1.0p120);
         if (u >> 31 != 0) {
             return -0.0;
         } else {
-            1.0
+            return 1.0;
         }
     }
 }
@@ -70,14 +70,14 @@ fn ceil64(x: f64) -> f64 {
     if (e <= 0x3FF-1) {
         math.forceEval(y);
         if (u >> 63 != 0) {
-            return -0.0;    // Compiler requires return.
+            return -0.0;
         } else {
-            1.0
+            return 1.0;
         }
     } else if (y < 0) {
-        x + y + 1
+        return x + y + 1;
     } else {
-        x + y
+        return x + y;
     }
 }
 
diff --git a/std/math/copysign.zig b/std/math/copysign.zig
index 109ee8c63..12e092c9a 100644
--- a/std/math/copysign.zig
+++ b/std/math/copysign.zig
@@ -2,11 +2,11 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 pub fn copysign(comptime T: type, x: T, y: T) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(copysign32, x, y),
         f64 => @inlineCall(copysign64, x, y),
         else => @compileError("copysign not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn copysign32(x: f32, y: f32) -> f32 {
@@ -15,7 +15,7 @@ fn copysign32(x: f32, y: f32) -> f32 {
 
     const h1 = ux & (@maxValue(u32) / 2);
     const h2 = uy & (u32(1) << 31);
-    @bitCast(f32, h1 | h2)
+    return @bitCast(f32, h1 | h2);
 }
 
 fn copysign64(x: f64, y: f64) -> f64 {
@@ -24,7 +24,7 @@ fn copysign64(x: f64, y: f64) -> f64 {
 
     const h1 = ux & (@maxValue(u64) / 2);
     const h2 = uy & (u64(1) << 63);
-    @bitCast(f64, h1 | h2)
+    return @bitCast(f64, h1 | h2);
 }
 
 test "math.copysign" {
diff --git a/std/math/cos.zig b/std/math/cos.zig
index 4b5c9193c..285a2e538 100644
--- a/std/math/cos.zig
+++ b/std/math/cos.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn cos(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(cos32, x),
         f64 => @inlineCall(cos64, x),
         else => @compileError("cos not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // sin polynomial coefficients
@@ -73,18 +73,18 @@ fn cos32(x_: f32) -> f32 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    const r = {
+    const r = r: {
         if (j == 1 or j == 2) {
-            z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))))
+            break :r z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))));
         } else {
-            1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))))
+            break :r 1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))));
         }
     };
 
     if (sign) {
-        -r
+        return -r;
     } else {
-        r
+        return r;
     }
 }
 
@@ -124,18 +124,18 @@ fn cos64(x_: f64) -> f64 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    const r = {
+    const r = r: {
         if (j == 1 or j == 2) {
-            z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))))
+            break :r z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))));
         } else {
-            1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))))
+            break :r 1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))));
         }
     };
 
     if (sign) {
-        -r
+        return -r;
     } else {
-        r
+        return r;
     }
 }
 
diff --git a/std/math/cosh.zig b/std/math/cosh.zig
index 34c647eaa..f7fea99bc 100644
--- a/std/math/cosh.zig
+++ b/std/math/cosh.zig
@@ -11,11 +11,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn cosh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(cosh32, x),
         f64 => @inlineCall(cosh64, x),
         else => @compileError("cosh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // cosh(x) = (exp(x) + 1 / exp(x)) / 2
@@ -43,7 +43,7 @@ fn cosh32(x: f32) -> f32 {
     }
 
     // |x| > log(FLT_MAX) or nan
-    expo2(ax)
+    return expo2(ax);
 }
 
 fn cosh64(x: f64) -> f64 {
@@ -76,7 +76,7 @@ fn cosh64(x: f64) -> f64 {
     }
 
     // |x| > log(CBL_MAX) or nan
-    expo2(ax)
+    return expo2(ax);
 }
 
 test "math.cosh" {
diff --git a/std/math/exp.zig b/std/math/exp.zig
index 87c0a1882..e51221a74 100644
--- a/std/math/exp.zig
+++ b/std/math/exp.zig
@@ -8,11 +8,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn exp(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(exp32, x),
         f64 => @inlineCall(exp64, x),
         else => @compileError("exp not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn exp32(x_: f32) -> f32 {
@@ -86,9 +86,9 @@ fn exp32(x_: f32) -> f32 {
     const y = 1 + (x * c / (2 - c) - lo + hi);
 
     if (k == 0) {
-        y
+        return y;
     } else {
-        math.scalbn(y, k)
+        return math.scalbn(y, k);
     }
 }
 
@@ -172,9 +172,9 @@ fn exp64(x_: f64) -> f64 {
     const y = 1 + (x * c / (2 - c) - lo + hi);
 
     if (k == 0) {
-        y
+        return y;
     } else {
-        math.scalbn(y, k)
+        return math.scalbn(y, k);
     }
 }
 
diff --git a/std/math/exp2.zig b/std/math/exp2.zig
index 111c1dad6..e867aabe2 100644
--- a/std/math/exp2.zig
+++ b/std/math/exp2.zig
@@ -8,11 +8,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn exp2(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(exp2_32, x),
         f64 => @inlineCall(exp2_64, x),
         else => @compileError("exp2 not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 const exp2ft = []const f64 {
@@ -88,7 +88,7 @@ fn exp2_32(x: f32) -> f32 {
     var r: f64 = exp2ft[i0];
     const t: f64 = r * z;
     r = r + t * (P1 + z * P2) + t * (z * z) * (P3 + z * P4);
-    f32(r * uk)
+    return f32(r * uk);
 }
 
 const exp2dt = []f64 {
@@ -414,7 +414,7 @@ fn exp2_64(x: f64) -> f64 {
     z -= exp2dt[2 * i0 + 1];
     const r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5))));
 
-    math.scalbn(r, ik)
+    return math.scalbn(r, ik);
 }
 
 test "math.exp2" {
diff --git a/std/math/expm1.zig b/std/math/expm1.zig
index ef0b2766b..14a69958e 100644
--- a/std/math/expm1.zig
+++ b/std/math/expm1.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn expm1(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(expm1_32, x),
         f64 => @inlineCall(expm1_64, x),
         else => @compileError("exp1m not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn expm1_32(x_: f32) -> f32 {
diff --git a/std/math/expo2.zig b/std/math/expo2.zig
index e0d8a8130..93111391a 100644
--- a/std/math/expo2.zig
+++ b/std/math/expo2.zig
@@ -2,11 +2,11 @@ const math = @import("index.zig");
 
 pub fn expo2(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => expo2f(x),
         f64 => expo2d(x),
         else => @compileError("expo2 not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn expo2f(x: f32) -> f32 {
@@ -15,7 +15,7 @@ fn expo2f(x: f32) -> f32 {
 
     const u = (0x7F + k / 2) << 23;
     const scale = @bitCast(f32, u);
-    math.exp(x - kln2) * scale * scale
+    return math.exp(x - kln2) * scale * scale;
 }
 
 fn expo2d(x: f64) -> f64 {
@@ -24,5 +24,5 @@ fn expo2d(x: f64) -> f64 {
 
     const u = (0x3FF + k / 2) << 20;
     const scale = @bitCast(f64, u64(u) << 32);
-    math.exp(x - kln2) * scale * scale
+    return math.exp(x - kln2) * scale * scale;
 }
diff --git a/std/math/fabs.zig b/std/math/fabs.zig
index e9bd3eb68..58244f4f2 100644
--- a/std/math/fabs.zig
+++ b/std/math/fabs.zig
@@ -8,23 +8,23 @@ const assert = @import("../debug.zig").assert;
 
 pub fn fabs(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(fabs32, x),
         f64 => @inlineCall(fabs64, x),
         else => @compileError("fabs not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn fabs32(x: f32) -> f32 {
     var u = @bitCast(u32, x);
     u &= 0x7FFFFFFF;
-    @bitCast(f32, u)
+    return @bitCast(f32, u);
 }
 
 fn fabs64(x: f64) -> f64 {
     var u = @bitCast(u64, x);
     u &= @maxValue(u64) >> 1;
-    @bitCast(f64, u)
+    return @bitCast(f64, u);
 }
 
 test "math.fabs" {
diff --git a/std/math/floor.zig b/std/math/floor.zig
index 85ee2b492..875070397 100644
--- a/std/math/floor.zig
+++ b/std/math/floor.zig
@@ -10,11 +10,11 @@ const math = @import("index.zig");
 
 pub fn floor(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(floor32, x),
         f64 => @inlineCall(floor64, x),
         else => @compileError("floor not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn floor32(x: f32) -> f32 {
@@ -40,13 +40,13 @@ fn floor32(x: f32) -> f32 {
         if (u >> 31 != 0) {
             u += m;
         }
-        @bitCast(f32, u & ~m)
+        return @bitCast(f32, u & ~m);
     } else {
         math.forceEval(x + 0x1.0p120);
         if (u >> 31 == 0) {
-            return 0.0; // Compiler requires return
+            return 0.0;
         } else {
-            -1.0
+            return -1.0;
         }
     }
 }
@@ -71,14 +71,14 @@ fn floor64(x: f64) -> f64 {
     if (e <= 0x3FF-1) {
         math.forceEval(y);
         if (u >> 63 != 0) {
-            return -1.0;    // Compiler requires return.
+            return -1.0;
         } else {
-            0.0
+            return 0.0;
         }
     } else if (y > 0) {
-        x + y - 1
+        return x + y - 1;
     } else {
-        x + y
+        return x + y;
     }
 }
 
diff --git a/std/math/fma.zig b/std/math/fma.zig
index 8dbbc39ed..c870dfd29 100644
--- a/std/math/fma.zig
+++ b/std/math/fma.zig
@@ -2,11 +2,11 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 pub fn fma(comptime T: type, x: T, y: T, z: T) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(fma32, x, y, z),
         f64 => @inlineCall(fma64, x, y ,z),
         else => @compileError("fma not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn fma32(x: f32, y: f32, z: f32) -> f32 {
@@ -16,10 +16,10 @@ fn fma32(x: f32, y: f32, z: f32) -> f32 {
     const e = (u >> 52) & 0x7FF;
 
     if ((u & 0x1FFFFFFF) != 0x10000000 or e == 0x7FF or xy_z - xy == z) {
-        f32(xy_z)
+        return f32(xy_z);
     } else {
         // TODO: Handle inexact case with double-rounding
-        f32(xy_z)
+        return f32(xy_z);
     }
 }
 
@@ -64,9 +64,9 @@ fn fma64(x: f64, y: f64, z: f64) -> f64 {
 
     const adj = add_adjusted(r.lo, xy.lo);
     if (spread + math.ilogb(r.hi) > -1023) {
-        math.scalbn(r.hi + adj, spread)
+        return math.scalbn(r.hi + adj, spread);
     } else {
-        add_and_denorm(r.hi, adj, spread)
+        return add_and_denorm(r.hi, adj, spread);
     }
 }
 
@@ -77,7 +77,7 @@ fn dd_add(a: f64, b: f64) -> dd {
     ret.hi = a + b;
     const s = ret.hi - a;
     ret.lo = (a - (ret.hi - s)) + (b - s);
-    ret
+    return ret;
 }
 
 fn dd_mul(a: f64, b: f64) -> dd {
@@ -99,7 +99,7 @@ fn dd_mul(a: f64, b: f64) -> dd {
 
     ret.hi = p + q;
     ret.lo = p - ret.hi + q + la * lb;
-    ret
+    return ret;
 }
 
 fn add_adjusted(a: f64, b: f64) -> f64 {
@@ -113,7 +113,7 @@ fn add_adjusted(a: f64, b: f64) -> f64 {
             sum.hi = @bitCast(f64, uhii);
         }
     }
-    sum.hi
+    return sum.hi;
 }
 
 fn add_and_denorm(a: f64, b: f64, scale: i32) -> f64 {
@@ -127,7 +127,7 @@ fn add_and_denorm(a: f64, b: f64, scale: i32) -> f64 {
             sum.hi = @bitCast(f64, uhii);
         }
     }
-    math.scalbn(sum.hi, scale)
+    return math.scalbn(sum.hi, scale);
 }
 
 test "math.fma" {
diff --git a/std/math/frexp.zig b/std/math/frexp.zig
index a40a6dcc3..e648555e3 100644
--- a/std/math/frexp.zig
+++ b/std/math/frexp.zig
@@ -8,21 +8,21 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 fn frexp_result(comptime T: type) -> type {
-    struct {
+    return struct {
         significand: T,
         exponent: i32,
-    }
+    };
 }
 pub const frexp32_result = frexp_result(f32);
 pub const frexp64_result = frexp_result(f64);
 
 pub fn frexp(x: var) -> frexp_result(@typeOf(x)) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(frexp32, x),
         f64 => @inlineCall(frexp64, x),
         else => @compileError("frexp not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn frexp32(x: f32) -> frexp32_result {
@@ -59,7 +59,7 @@ fn frexp32(x: f32) -> frexp32_result {
     y &= 0x807FFFFF;
     y |= 0x3F000000;
     result.significand = @bitCast(f32, y);
-    result
+    return result;
 }
 
 fn frexp64(x: f64) -> frexp64_result {
@@ -96,7 +96,7 @@ fn frexp64(x: f64) -> frexp64_result {
     y &= 0x800FFFFFFFFFFFFF;
     y |= 0x3FE0000000000000;
     result.significand = @bitCast(f64, y);
-    result
+    return result;
 }
 
 test "math.frexp" {
diff --git a/std/math/hypot.zig b/std/math/hypot.zig
index ee8ce0f51..68794e24f 100644
--- a/std/math/hypot.zig
+++ b/std/math/hypot.zig
@@ -9,11 +9,11 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 pub fn hypot(comptime T: type, x: T, y: T) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(hypot32, x, y),
         f64 => @inlineCall(hypot64, x, y),
         else => @compileError("hypot not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn hypot32(x: f32, y: f32) -> f32 {
@@ -48,7 +48,7 @@ fn hypot32(x: f32, y: f32) -> f32 {
         yy *= 0x1.0p-90;
     }
 
-    z * math.sqrt(f32(f64(x) * x + f64(y) * y))
+    return z * math.sqrt(f32(f64(x) * x + f64(y) * y));
 }
 
 fn sq(hi: &f64, lo: &f64, x: f64) {
@@ -109,7 +109,7 @@ fn hypot64(x: f64, y: f64) -> f64 {
     sq(&hx, &lx, x);
     sq(&hy, &ly, y);
 
-    z * math.sqrt(ly + lx + hy + hx)
+    return z * math.sqrt(ly + lx + hy + hx);
 }
 
 test "math.hypot" {
diff --git a/std/math/ilogb.zig b/std/math/ilogb.zig
index 2a0ea7fc5..e056ceb09 100644
--- a/std/math/ilogb.zig
+++ b/std/math/ilogb.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn ilogb(x: var) -> i32 {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(ilogb32, x),
         f64 => @inlineCall(ilogb64, x),
         else => @compileError("ilogb not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // NOTE: Should these be exposed publically?
@@ -53,7 +53,7 @@ fn ilogb32(x: f32) -> i32 {
         }
     }
 
-    e - 0x7F
+    return e - 0x7F;
 }
 
 fn ilogb64(x: f64) -> i32 {
@@ -88,7 +88,7 @@ fn ilogb64(x: f64) -> i32 {
         }
     }
 
-    e - 0x3FF
+    return e - 0x3FF;
 }
 
 test "math.ilogb" {
diff --git a/std/math/index.zig b/std/math/index.zig
index 029f2836b..1991864f6 100644
--- a/std/math/index.zig
+++ b/std/math/index.zig
@@ -36,7 +36,7 @@ pub const inf = @import("inf.zig").inf;
 
 pub fn approxEq(comptime T: type, x: T, y: T, epsilon: T) -> bool {
     assert(@typeId(T) == TypeId.Float);
-    fabs(x - y) < epsilon
+    return fabs(x - y) < epsilon;
 }
 
 // TODO: Hide the following in an internal module.
@@ -175,7 +175,7 @@ test "math" {
 
 
 pub fn min(x: var, y: var) -> @typeOf(x + y) {
-    if (x < y) x else y
+    return if (x < y) x else y;
 }
 
 test "math.min" {
@@ -183,7 +183,7 @@ test "math.min" {
 }
 
 pub fn max(x: var, y: var) -> @typeOf(x + y) {
-    if (x > y) x else y
+    return if (x > y) x else y;
 }
 
 test "math.max" {
@@ -193,19 +193,19 @@ test "math.max" {
 error Overflow;
 pub fn mul(comptime T: type, a: T, b: T) -> %T {
     var answer: T = undefined;
-    if (@mulWithOverflow(T, a, b, &answer)) error.Overflow else answer
+    return if (@mulWithOverflow(T, a, b, &answer)) error.Overflow else answer;
 }
 
 error Overflow;
 pub fn add(comptime T: type, a: T, b: T) -> %T {
     var answer: T = undefined;
-    if (@addWithOverflow(T, a, b, &answer)) error.Overflow else answer
+    return if (@addWithOverflow(T, a, b, &answer)) error.Overflow else answer;
 }
 
 error Overflow;
 pub fn sub(comptime T: type, a: T, b: T) -> %T {
     var answer: T = undefined;
-    if (@subWithOverflow(T, a, b, &answer)) error.Overflow else answer
+    return if (@subWithOverflow(T, a, b, &answer)) error.Overflow else answer;
 }
 
 pub fn negate(x: var) -> %@typeOf(x) {
@@ -215,7 +215,7 @@ pub fn negate(x: var) -> %@typeOf(x) {
 error Overflow;
 pub fn shlExact(comptime T: type, a: T, shift_amt: Log2Int(T)) -> %T {
     var answer: T = undefined;
-    if (@shlWithOverflow(T, a, shift_amt, &answer)) error.Overflow else answer
+    return if (@shlWithOverflow(T, a, shift_amt, &answer)) error.Overflow else answer;
 }
 
 /// Shifts left. Overflowed bits are truncated.
@@ -267,7 +267,7 @@ test "math.shr" {
 }
 
 pub fn Log2Int(comptime T: type) -> type {
-    @IntType(false, log2(T.bit_count))
+    return @IntType(false, log2(T.bit_count));
 }
 
 test "math overflow functions" {
diff --git a/std/math/inf.zig b/std/math/inf.zig
index ed559c313..546e6f3af 100644
--- a/std/math/inf.zig
+++ b/std/math/inf.zig
@@ -2,9 +2,9 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 pub fn inf(comptime T: type) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @bitCast(f32, math.inf_u32),
         f64 => @bitCast(f64, math.inf_u64),
         else => @compileError("inf not implemented for " ++ @typeName(T)),
-    }
+    };
 }
diff --git a/std/math/isfinite.zig b/std/math/isfinite.zig
index 6dbf98472..d44d373cf 100644
--- a/std/math/isfinite.zig
+++ b/std/math/isfinite.zig
@@ -6,11 +6,11 @@ pub fn isFinite(x: var) -> bool {
     switch (T) {
         f32 => {
             const bits = @bitCast(u32, x);
-            bits & 0x7FFFFFFF < 0x7F800000
+            return bits & 0x7FFFFFFF < 0x7F800000;
         },
         f64 => {
             const bits = @bitCast(u64, x);
-            bits & (@maxValue(u64) >> 1) < (0x7FF << 52)
+            return bits & (@maxValue(u64) >> 1) < (0x7FF << 52);
         },
         else => {
             @compileError("isFinite not implemented for " ++ @typeName(T));
diff --git a/std/math/isinf.zig b/std/math/isinf.zig
index b388fabf1..98c90e72a 100644
--- a/std/math/isinf.zig
+++ b/std/math/isinf.zig
@@ -6,11 +6,11 @@ pub fn isInf(x: var) -> bool {
     switch (T) {
         f32 => {
             const bits = @bitCast(u32, x);
-            bits & 0x7FFFFFFF == 0x7F800000
+            return bits & 0x7FFFFFFF == 0x7F800000;
         },
         f64 => {
             const bits = @bitCast(u64, x);
-            bits & (@maxValue(u64) >> 1) == (0x7FF << 52)
+            return bits & (@maxValue(u64) >> 1) == (0x7FF << 52);
         },
         else => {
             @compileError("isInf not implemented for " ++ @typeName(T));
@@ -22,10 +22,10 @@ pub fn isPositiveInf(x: var) -> bool {
     const T = @typeOf(x);
     switch (T) {
         f32 => {
-            @bitCast(u32, x) == 0x7F800000
+            return @bitCast(u32, x) == 0x7F800000;
         },
         f64 => {
-            @bitCast(u64, x) == 0x7FF << 52
+            return @bitCast(u64, x) == 0x7FF << 52;
         },
         else => {
             @compileError("isPositiveInf not implemented for " ++ @typeName(T));
@@ -37,10 +37,10 @@ pub fn isNegativeInf(x: var) -> bool {
     const T = @typeOf(x);
     switch (T) {
         f32 => {
-            @bitCast(u32, x) == 0xFF800000
+            return @bitCast(u32, x) == 0xFF800000;
         },
         f64 => {
-            @bitCast(u64, x) == 0xFFF << 52
+            return @bitCast(u64, x) == 0xFFF << 52;
         },
         else => {
             @compileError("isNegativeInf not implemented for " ++ @typeName(T));
diff --git a/std/math/isnan.zig b/std/math/isnan.zig
index 8bcb200a6..e996a7269 100644
--- a/std/math/isnan.zig
+++ b/std/math/isnan.zig
@@ -6,11 +6,11 @@ pub fn isNan(x: var) -> bool {
     switch (T) {
         f32 => {
             const bits = @bitCast(u32, x);
-            bits & 0x7FFFFFFF > 0x7F800000
+            return bits & 0x7FFFFFFF > 0x7F800000;
         },
         f64 => {
             const bits = @bitCast(u64, x);
-            (bits & (@maxValue(u64) >> 1)) > (u64(0x7FF) << 52)
+            return (bits & (@maxValue(u64) >> 1)) > (u64(0x7FF) << 52);
         },
         else => {
             @compileError("isNan not implemented for " ++ @typeName(T));
@@ -21,7 +21,7 @@ pub fn isNan(x: var) -> bool {
 // Note: A signalling nan is identical to a standard right now by may have a different bit
 // representation in the future when required.
 pub fn isSignalNan(x: var) -> bool {
-    isNan(x)
+    return isNan(x);
 }
 
 test "math.isNan" {
diff --git a/std/math/isnormal.zig b/std/math/isnormal.zig
index b212d204d..f815c2680 100644
--- a/std/math/isnormal.zig
+++ b/std/math/isnormal.zig
@@ -6,11 +6,11 @@ pub fn isNormal(x: var) -> bool {
     switch (T) {
         f32 => {
             const bits = @bitCast(u32, x);
-            (bits + 0x00800000) & 0x7FFFFFFF >= 0x01000000
+            return (bits + 0x00800000) & 0x7FFFFFFF >= 0x01000000;
         },
         f64 => {
             const bits = @bitCast(u64, x);
-            (bits + (1 << 52)) & (@maxValue(u64) >> 1) >= (1 << 53)
+            return (bits + (1 << 52)) & (@maxValue(u64) >> 1) >= (1 << 53);
         },
         else => {
             @compileError("isNormal not implemented for " ++ @typeName(T));
diff --git a/std/math/ln.zig b/std/math/ln.zig
index 7ced6238e..4ded89d32 100644
--- a/std/math/ln.zig
+++ b/std/math/ln.zig
@@ -14,7 +14,7 @@ pub fn ln(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
     switch (@typeId(T)) {
         TypeId.FloatLiteral => {
-            return @typeOf(1.0)(ln_64(x))
+            return @typeOf(1.0)(ln_64(x));
         },
         TypeId.Float => {
             return switch (T) {
@@ -84,7 +84,7 @@ pub fn ln_32(x_: f32) -> f32 {
     const hfsq = 0.5 * f * f;
     const dk = f32(k);
 
-    s * (hfsq + R) + dk * ln2_lo - hfsq + f + dk * ln2_hi
+    return s * (hfsq + R) + dk * ln2_lo - hfsq + f + dk * ln2_hi;
 }
 
 pub fn ln_64(x_: f64) -> f64 {
@@ -116,7 +116,7 @@ pub fn ln_64(x_: f64) -> f64 {
         // subnormal, scale x
         k -= 54;
         x *= 0x1.0p54;
-        hx = u32(@bitCast(u64, ix) >> 32)
+        hx = u32(@bitCast(u64, ix) >> 32);
     }
     else if (hx >= 0x7FF00000) {
         return x;
@@ -142,7 +142,7 @@ pub fn ln_64(x_: f64) -> f64 {
     const R = t2 + t1;
     const dk = f64(k);
 
-    s * (hfsq + R) + dk * ln2_lo - hfsq + f + dk * ln2_hi
+    return s * (hfsq + R) + dk * ln2_lo - hfsq + f + dk * ln2_hi;
 }
 
 test "math.ln" {
diff --git a/std/math/log.zig b/std/math/log.zig
index 075cecc89..1ff226f7e 100644
--- a/std/math/log.zig
+++ b/std/math/log.zig
@@ -29,7 +29,7 @@ pub fn log(comptime T: type, base: T, x: T) -> T {
                 f32 => return f32(math.ln(f64(x)) / math.ln(f64(base))),
                 f64 => return math.ln(x) / math.ln(f64(base)),
                 else => @compileError("log not implemented for " ++ @typeName(T)),
-            };
+            }
         },
 
         else => {
diff --git a/std/math/log10.zig b/std/math/log10.zig
index 75e1203ad..73168dec8 100644
--- a/std/math/log10.zig
+++ b/std/math/log10.zig
@@ -14,7 +14,7 @@ pub fn log10(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
     switch (@typeId(T)) {
         TypeId.FloatLiteral => {
-            return @typeOf(1.0)(log10_64(x))
+            return @typeOf(1.0)(log10_64(x));
         },
         TypeId.Float => {
             return switch (T) {
@@ -90,7 +90,7 @@ pub fn log10_32(x_: f32) -> f32 {
     const lo = f - hi - hfsq + s * (hfsq + R);
     const dk = f32(k);
 
-    dk * log10_2lo + (lo + hi) * ivln10lo + lo * ivln10hi + hi * ivln10hi + dk * log10_2hi
+    return dk * log10_2lo + (lo + hi) * ivln10lo + lo * ivln10hi + hi * ivln10hi + dk * log10_2hi;
 }
 
 pub fn log10_64(x_: f64) -> f64 {
@@ -124,7 +124,7 @@ pub fn log10_64(x_: f64) -> f64 {
         // subnormal, scale x
         k -= 54;
         x *= 0x1.0p54;
-        hx = u32(@bitCast(u64, x) >> 32)
+        hx = u32(@bitCast(u64, x) >> 32);
     }
     else if (hx >= 0x7FF00000) {
         return x;
@@ -167,7 +167,7 @@ pub fn log10_64(x_: f64) -> f64 {
     val_lo += (y - ww) + val_hi;
     val_hi = ww;
 
-    val_lo + val_hi
+    return val_lo + val_hi;
 }
 
 test "math.log10" {
diff --git a/std/math/log1p.zig b/std/math/log1p.zig
index 803726fdc..433a7c619 100644
--- a/std/math/log1p.zig
+++ b/std/math/log1p.zig
@@ -11,11 +11,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn log1p(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(log1p_32, x),
         f64 => @inlineCall(log1p_64, x),
         else => @compileError("log1p not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn log1p_32(x: f32) -> f32 {
@@ -91,7 +91,7 @@ fn log1p_32(x: f32) -> f32 {
     const hfsq = 0.5 * f * f;
     const dk = f32(k);
 
-    s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi
+    return s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi;
 }
 
 fn log1p_64(x: f64) -> f64 {
@@ -172,7 +172,7 @@ fn log1p_64(x: f64) -> f64 {
     const R = t2 + t1;
     const dk = f64(k);
 
-    s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi
+    return s * (hfsq + R) + (dk * ln2_lo + c) - hfsq + f + dk * ln2_hi;
 }
 
 test "math.log1p" {
diff --git a/std/math/log2.zig b/std/math/log2.zig
index 2199d6bfa..1b38a9ece 100644
--- a/std/math/log2.zig
+++ b/std/math/log2.zig
@@ -14,7 +14,7 @@ pub fn log2(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
     switch (@typeId(T)) {
         TypeId.FloatLiteral => {
-            return @typeOf(1.0)(log2_64(x))
+            return @typeOf(1.0)(log2_64(x));
         },
         TypeId.Float => {
             return switch (T) {
@@ -26,7 +26,7 @@ pub fn log2(x: var) -> @typeOf(x) {
         TypeId.IntLiteral => comptime {
             var result = 0;
             var x_shifted = x;
-            while ({x_shifted >>= 1; x_shifted != 0}) : (result += 1) {}
+            while (b: {x_shifted >>= 1; break :b x_shifted != 0;}) : (result += 1) {}
             return result;
         },
         TypeId.Int => {
@@ -94,7 +94,7 @@ pub fn log2_32(x_: f32) -> f32 {
     u &= 0xFFFFF000;
     hi = @bitCast(f32, u);
     const lo = f - hi - hfsq + s * (hfsq + R);
-    (lo + hi) * ivln2lo + lo * ivln2hi + hi * ivln2hi + f32(k)
+    return (lo + hi) * ivln2lo + lo * ivln2hi + hi * ivln2hi + f32(k);
 }
 
 pub fn log2_64(x_: f64) -> f64 {
@@ -165,7 +165,7 @@ pub fn log2_64(x_: f64) -> f64 {
     val_lo += (y - ww) + val_hi;
     val_hi = ww;
 
-    val_lo + val_hi
+    return val_lo + val_hi;
 }
 
 test "math.log2" {
diff --git a/std/math/modf.zig b/std/math/modf.zig
index 25eab7f99..5b78680c5 100644
--- a/std/math/modf.zig
+++ b/std/math/modf.zig
@@ -7,21 +7,21 @@ const math = @import("index.zig");
 const assert = @import("../debug.zig").assert;
 
 fn modf_result(comptime T: type) -> type {
-    struct {
+    return struct {
         fpart: T,
         ipart: T,
-    }
+    };
 }
 pub const modf32_result = modf_result(f32);
 pub const modf64_result = modf_result(f64);
 
 pub fn modf(x: var) -> modf_result(@typeOf(x)) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(modf32, x),
         f64 => @inlineCall(modf64, x),
         else => @compileError("modf not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn modf32(x: f32) -> modf32_result {
@@ -66,7 +66,7 @@ fn modf32(x: f32) -> modf32_result {
     const uf = @bitCast(f32, u & ~mask);
     result.ipart = uf;
     result.fpart = x - uf;
-    result
+    return result;
 }
 
 fn modf64(x: f64) -> modf64_result {
@@ -110,7 +110,7 @@ fn modf64(x: f64) -> modf64_result {
     const uf = @bitCast(f64, u & ~mask);
     result.ipart = uf;
     result.fpart = x - uf;
-    result
+    return result;
 }
 
 test "math.modf" {
diff --git a/std/math/nan.zig b/std/math/nan.zig
index a4899d6b8..e92bb04cb 100644
--- a/std/math/nan.zig
+++ b/std/math/nan.zig
@@ -1,19 +1,19 @@
 const math = @import("index.zig");
 
 pub fn nan(comptime T: type) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @bitCast(f32, math.nan_u32),
         f64 => @bitCast(f64, math.nan_u64),
         else => @compileError("nan not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // Note: A signalling nan is identical to a standard right now by may have a different bit
 // representation in the future when required.
 pub fn snan(comptime T: type) -> T {
-    switch (T) {
+    return switch (T) {
         f32 => @bitCast(f32, math.nan_u32),
         f64 => @bitCast(f64, math.nan_u64),
         else => @compileError("snan not implemented for " ++ @typeName(T)),
-    }
+    };
 }
diff --git a/std/math/pow.zig b/std/math/pow.zig
index 85c3a71d5..55a2cd8c3 100644
--- a/std/math/pow.zig
+++ b/std/math/pow.zig
@@ -166,12 +166,12 @@ pub fn pow(comptime T: type, x: T, y: T) -> T {
         ae = -ae;
     }
 
-    math.scalbn(a1, ae)
+    return math.scalbn(a1, ae);
 }
 
 fn isOddInteger(x: f64) -> bool {
     const r = math.modf(x);
-    r.fpart == 0.0 and i64(r.ipart) & 1 == 1
+    return r.fpart == 0.0 and i64(r.ipart) & 1 == 1;
 }
 
 test "math.pow" {
diff --git a/std/math/round.zig b/std/math/round.zig
index a16bedc3f..8e604d1b6 100644
--- a/std/math/round.zig
+++ b/std/math/round.zig
@@ -10,11 +10,11 @@ const math = @import("index.zig");
 
 pub fn round(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(round32, x),
         f64 => @inlineCall(round64, x),
         else => @compileError("round not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn round32(x_: f32) -> f32 {
@@ -48,9 +48,9 @@ fn round32(x_: f32) -> f32 {
     }
 
     if (u >> 31 != 0) {
-        -y
+        return -y;
     } else {
-        y
+        return y;
     }
 }
 
@@ -85,9 +85,9 @@ fn round64(x_: f64) -> f64 {
     }
 
     if (u >> 63 != 0) {
-        -y
+        return -y;
     } else {
-        y
+        return y;
     }
 }
 
diff --git a/std/math/scalbn.zig b/std/math/scalbn.zig
index 6e8219449..0c898a783 100644
--- a/std/math/scalbn.zig
+++ b/std/math/scalbn.zig
@@ -3,11 +3,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn scalbn(x: var, n: i32) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(scalbn32, x, n),
         f64 => @inlineCall(scalbn64, x, n),
         else => @compileError("scalbn not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn scalbn32(x: f32, n_: i32) -> f32 {
@@ -37,7 +37,7 @@ fn scalbn32(x: f32, n_: i32) -> f32 {
     }
 
     const u = u32(n +% 0x7F) << 23;
-    y * @bitCast(f32, u)
+    return y * @bitCast(f32, u);
 }
 
 fn scalbn64(x: f64, n_: i32) -> f64 {
@@ -67,7 +67,7 @@ fn scalbn64(x: f64, n_: i32) -> f64 {
     }
 
     const u = u64(n +% 0x3FF) << 52;
-    y * @bitCast(f64, u)
+    return y * @bitCast(f64, u);
 }
 
 test "math.scalbn" {
diff --git a/std/math/signbit.zig b/std/math/signbit.zig
index 75b087f53..6efbc4db5 100644
--- a/std/math/signbit.zig
+++ b/std/math/signbit.zig
@@ -3,21 +3,21 @@ const assert = @import("../debug.zig").assert;
 
 pub fn signbit(x: var) -> bool {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(signbit32, x),
         f64 => @inlineCall(signbit64, x),
         else => @compileError("signbit not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn signbit32(x: f32) -> bool {
     const bits = @bitCast(u32, x);
-    bits >> 31 != 0
+    return bits >> 31 != 0;
 }
 
 fn signbit64(x: f64) -> bool {
     const bits = @bitCast(u64, x);
-    bits >> 63 != 0
+    return bits >> 63 != 0;
 }
 
 test "math.signbit" {
diff --git a/std/math/sin.zig b/std/math/sin.zig
index 508bf5fae..6fbbaff29 100644
--- a/std/math/sin.zig
+++ b/std/math/sin.zig
@@ -10,11 +10,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn sin(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(sin32, x),
         f64 => @inlineCall(sin64, x),
         else => @compileError("sin not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // sin polynomial coefficients
@@ -75,18 +75,18 @@ fn sin32(x_: f32) -> f32 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    const r = {
+    const r = r: {
         if (j == 1 or j == 2) {
-            1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))))
+            break :r 1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))));
         } else {
-            z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))))
+            break :r z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))));
         }
     };
 
     if (sign) {
-        -r
+        return -r;
     } else {
-        r
+        return r;
     }
 }
 
@@ -127,25 +127,25 @@ fn sin64(x_: f64) -> f64 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    const r = {
+    const r = r: {
         if (j == 1 or j == 2) {
-            1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))))
+            break :r 1.0 - 0.5 * w + w * w * (C5 + w * (C4 + w * (C3 + w * (C2 + w * (C1 + w * C0)))));
         } else {
-            z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))))
+            break :r z + z * w * (S5 + w * (S4 + w * (S3 + w * (S2 + w * (S1 + w * S0)))));
         }
     };
 
     if (sign) {
-        -r
+        return -r;
     } else {
-        r
+        return r;
     }
 }
 
 test "math.sin" {
     assert(sin(f32(0.0)) == sin32(0.0));
     assert(sin(f64(0.0)) == sin64(0.0));
-    assert(comptime {math.sin(f64(2))} == math.sin(f64(2)));
+    assert(comptime (math.sin(f64(2))) == math.sin(f64(2)));
 }
 
 test "math.sin32" {
diff --git a/std/math/sinh.zig b/std/math/sinh.zig
index 32f67a49a..095dd7ea0 100644
--- a/std/math/sinh.zig
+++ b/std/math/sinh.zig
@@ -11,11 +11,11 @@ const expo2 = @import("expo2.zig").expo2;
 
 pub fn sinh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(sinh32, x),
         f64 => @inlineCall(sinh64, x),
         else => @compileError("sinh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // sinh(x) = (exp(x) - 1 / exp(x)) / 2
@@ -49,7 +49,7 @@ fn sinh32(x: f32) -> f32 {
     }
 
     // |x| > log(FLT_MAX) or nan
-    2 * h * expo2(ax)
+    return 2 * h * expo2(ax);
 }
 
 fn sinh64(x: f64) -> f64 {
@@ -83,7 +83,7 @@ fn sinh64(x: f64) -> f64 {
     }
 
     // |x| > log(DBL_MAX) or nan
-    2 * h * expo2(ax)
+    return 2 * h * expo2(ax);
 }
 
 test "math.sinh" {
diff --git a/std/math/sqrt.zig b/std/math/sqrt.zig
index 86426af3a..263e61661 100644
--- a/std/math/sqrt.zig
+++ b/std/math/sqrt.zig
@@ -14,7 +14,7 @@ pub fn sqrt(x: var) -> (if (@typeId(@typeOf(x)) == TypeId.Int) @IntType(false, @
     const T = @typeOf(x);
     switch (@typeId(T)) {
         TypeId.FloatLiteral => {
-            return T(sqrt64(x))
+            return T(sqrt64(x));
         },
         TypeId.Float => {
             return switch (T) {
@@ -64,7 +64,7 @@ fn sqrt32(x: f32) -> f32 {
         // subnormal
         var i: i32 = 0;
         while (ix & 0x00800000 == 0) : (i += 1) {
-            ix <<= 1
+            ix <<= 1;
         }
         m -= i - 1;
     }
@@ -112,7 +112,7 @@ fn sqrt32(x: f32) -> f32 {
 
     ix = (q >> 1) + 0x3f000000;
     ix += m << 23;
-    @bitCast(f32, ix)
+    return @bitCast(f32, ix);
 }
 
 // NOTE: The original code is full of implicit signed -> unsigned assumptions and u32 wraparound
@@ -153,7 +153,7 @@ fn sqrt64(x: f64) -> f64 {
         // subnormal
         var i: u32 = 0;
         while (ix0 & 0x00100000 == 0) : (i += 1) {
-            ix0 <<= 1
+            ix0 <<= 1;
         }
         m -= i32(i) - 1;
         ix0 |= ix1 >> u5(32 - i);
@@ -245,7 +245,7 @@ fn sqrt64(x: f64) -> f64 {
     iix0 = iix0 +% (m << 20);
 
     const uz = (u64(iix0) << 32) | ix1;
-    @bitCast(f64, uz)
+    return @bitCast(f64, uz);
 }
 
 test "math.sqrt" {
diff --git a/std/math/tan.zig b/std/math/tan.zig
index 6ac30fa66..2a3c46eb6 100644
--- a/std/math/tan.zig
+++ b/std/math/tan.zig
@@ -10,11 +10,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn tan(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(tan32, x),
         f64 => @inlineCall(tan64, x),
         else => @compileError("tan not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 const Tp0 = -1.30936939181383777646E4;
@@ -62,11 +62,11 @@ fn tan32(x_: f32) -> f32 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    var r = {
+    var r = r: {
         if (w > 1e-14) {
-            z + z * (w * ((Tp0 * w + Tp1) * w + Tp2) / ((((w + Tq1) * w + Tq2) * w + Tq3) * w + Tq4))
+            break :r z + z * (w * ((Tp0 * w + Tp1) * w + Tp2) / ((((w + Tq1) * w + Tq2) * w + Tq3) * w + Tq4));
         } else {
-            z
+            break :r z;
         }
     };
 
@@ -77,7 +77,7 @@ fn tan32(x_: f32) -> f32 {
         r = -r;
     }
 
-    r
+    return r;
 }
 
 fn tan64(x_: f64) -> f64 {
@@ -111,11 +111,11 @@ fn tan64(x_: f64) -> f64 {
     const z = ((x - y * pi4a) - y * pi4b) - y * pi4c;
     const w = z * z;
 
-    var r = {
+    var r = r: {
         if (w > 1e-14) {
-            z + z * (w * ((Tp0 * w + Tp1) * w + Tp2) / ((((w + Tq1) * w + Tq2) * w + Tq3) * w + Tq4))
+            break :r z + z * (w * ((Tp0 * w + Tp1) * w + Tp2) / ((((w + Tq1) * w + Tq2) * w + Tq3) * w + Tq4));
         } else {
-            z
+            break :r z;
         }
     };
 
@@ -126,7 +126,7 @@ fn tan64(x_: f64) -> f64 {
         r = -r;
     }
 
-    r
+    return r;
 }
 
 test "math.tan" {
diff --git a/std/math/tanh.zig b/std/math/tanh.zig
index d9704f458..c4fe8f203 100644
--- a/std/math/tanh.zig
+++ b/std/math/tanh.zig
@@ -11,11 +11,11 @@ const expo2 = @import("expo2.zig").expo2;
 
 pub fn tanh(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(tanh32, x),
         f64 => @inlineCall(tanh64, x),
         else => @compileError("tanh not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 // tanh(x) = (exp(x) - exp(-x)) / (exp(x) + exp(-x))
@@ -59,9 +59,9 @@ fn tanh32(x: f32) -> f32 {
     }
 
     if (u >> 31 != 0) {
-        -t
+        return -t;
     } else {
-        t
+        return t;
     }
 }
 
@@ -104,9 +104,9 @@ fn tanh64(x: f64) -> f64 {
     }
 
     if (u >> 63 != 0) {
-        -t
+        return -t;
     } else {
-        t
+        return t;
     }
 }
 
diff --git a/std/math/trunc.zig b/std/math/trunc.zig
index 937a8155e..01cb1bb84 100644
--- a/std/math/trunc.zig
+++ b/std/math/trunc.zig
@@ -9,11 +9,11 @@ const assert = @import("../debug.zig").assert;
 
 pub fn trunc(x: var) -> @typeOf(x) {
     const T = @typeOf(x);
-    switch (T) {
+    return switch (T) {
         f32 => @inlineCall(trunc32, x),
         f64 => @inlineCall(trunc64, x),
         else => @compileError("trunc not implemented for " ++ @typeName(T)),
-    }
+    };
 }
 
 fn trunc32(x: f32) -> f32 {
@@ -30,10 +30,10 @@ fn trunc32(x: f32) -> f32 {
 
     m = u32(@maxValue(u32)) >> u5(e);
     if (u & m == 0) {
-        x
+        return x;
     } else {
         math.forceEval(x + 0x1p120);
-        @bitCast(f32, u & ~m)
+        return @bitCast(f32, u & ~m);
     }
 }
 
@@ -51,10 +51,10 @@ fn trunc64(x: f64) -> f64 {
 
     m = u64(@maxValue(u64)) >> u6(e);
     if (u & m == 0) {
-        x
+        return x;
     } else {
         math.forceEval(x + 0x1p120);
-        @bitCast(f64, u & ~m)
+        return @bitCast(f64, u & ~m);
     }
 }
 
diff --git a/std/mem.zig b/std/mem.zig
index 4b3516b05..7438eba70 100644
--- a/std/mem.zig
+++ b/std/mem.zig
@@ -354,11 +354,11 @@ pub fn eql_slice_u8(a: []const u8, b: []const u8) -> bool {
 /// split("   abc def    ghi  ", " ")
 /// Will return slices for "abc", "def", "ghi", null, in that order.
 pub fn split(buffer: []const u8, split_bytes: []const u8) -> SplitIterator {
-    SplitIterator {
+    return SplitIterator {
         .index = 0,
         .buffer = buffer,
         .split_bytes = split_bytes,
-    }
+    };
 }
 
 test "mem.split" {
@@ -552,7 +552,7 @@ test "std.mem.reverse" {
     var arr = []i32{ 5, 3, 1, 2, 4 };
     reverse(i32, arr[0..]);
 
-    assert(eql(i32, arr, []i32{ 4, 2, 1, 3, 5 }))
+    assert(eql(i32, arr, []i32{ 4, 2, 1, 3, 5 }));
 }
 
 /// In-place rotation of the values in an array ([0 1 2 3] becomes [1 2 3 0] if we rotate by 1)
@@ -567,5 +567,5 @@ test "std.mem.rotate" {
     var arr = []i32{ 5, 3, 1, 2, 4 };
     rotate(i32, arr[0..], 2);
 
-    assert(eql(i32, arr, []i32{ 1, 2, 4, 5, 3 }))
+    assert(eql(i32, arr, []i32{ 1, 2, 4, 5, 3 }));
 }
diff --git a/std/net.zig b/std/net.zig
index 3551499c6..a5fd4d603 100644
--- a/std/net.zig
+++ b/std/net.zig
@@ -72,7 +72,7 @@ pub fn lookup(hostname: []const u8, out_addrs: []Address) -> %[]Address {
 //		if (family != AF_INET)
 //			buf[cnt++] = (struct address){ .family = AF_INET6, .addr = { [15] = 1 } };
 //
-        unreachable // TODO
+        unreachable; // TODO
     }
 
     // TODO
@@ -84,7 +84,7 @@ pub fn lookup(hostname: []const u8, out_addrs: []Address) -> %[]Address {
     //    else => {},
     //};
 
-    unreachable // TODO
+    unreachable; // TODO
 }
 
 pub fn connectAddr(addr: &Address, port: u16) -> %Connection {
@@ -96,23 +96,23 @@ pub fn connectAddr(addr: &Address, port: u16) -> %Connection {
     }
     const socket_fd = i32(socket_ret);
 
-    const connect_ret = if (addr.family == linux.AF_INET) {
+    const connect_ret = if (addr.family == linux.AF_INET) x: {
         var os_addr: linux.sockaddr_in = undefined;
         os_addr.family = addr.family;
         os_addr.port = endian.swapIfLe(u16, port);
         @memcpy((&u8)(&os_addr.addr), &addr.addr[0], 4);
         @memset(&os_addr.zero[0], 0, @sizeOf(@typeOf(os_addr.zero)));
-        linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in))
-    } else if (addr.family == linux.AF_INET6) {
+        break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in));
+    } else if (addr.family == linux.AF_INET6) x: {
         var os_addr: linux.sockaddr_in6 = undefined;
         os_addr.family = addr.family;
         os_addr.port = endian.swapIfLe(u16, port);
         os_addr.flowinfo = 0;
         os_addr.scope_id = addr.scope_id;
         @memcpy(&os_addr.addr[0], &addr.addr[0], 16);
-        linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in6))
+        break :x linux.connect(socket_fd, (&linux.sockaddr)(&os_addr), @sizeOf(linux.sockaddr_in6));
     } else {
-        unreachable
+        unreachable;
     };
     const connect_err = linux.getErrno(connect_ret);
     if (connect_err > 0) {
@@ -165,13 +165,13 @@ pub fn parseIpLiteral(buf: []const u8) -> %Address {
 fn hexDigit(c: u8) -> u8 {
     // TODO use switch with range
     if ('0' <= c and c <= '9') {
-        c - '0'
+        return c - '0';
     } else if ('A' <= c and c <= 'Z') {
-        c - 'A' + 10
+        return c - 'A' + 10;
     } else if ('a' <= c and c <= 'z') {
-        c - 'a' + 10
+        return c - 'a' + 10;
     } else {
-        @maxValue(u8)
+        return @maxValue(u8);
     }
 }
 
diff --git a/std/os/child_process.zig b/std/os/child_process.zig
index 5aa157858..e719af65a 100644
--- a/std/os/child_process.zig
+++ b/std/os/child_process.zig
@@ -115,7 +115,7 @@ pub const ChildProcess = struct {
             return self.spawnWindows();
         } else {
             return self.spawnPosix();
-        };
+        }
     }
 
     pub fn spawnAndWait(self: &ChildProcess) -> %Term {
@@ -249,12 +249,12 @@ pub const ChildProcess = struct {
     fn waitUnwrappedWindows(self: &ChildProcess) -> %void {
         const result = os.windowsWaitSingle(self.handle, windows.INFINITE);
 
-        self.term = (%Term)({
+        self.term = (%Term)(x: {
             var exit_code: windows.DWORD = undefined;
             if (windows.GetExitCodeProcess(self.handle, &exit_code) == 0) {
-                Term { .Unknown = 0 }
+                break :x Term { .Unknown = 0 };
             } else {
-                Term { .Exited = @bitCast(i32, exit_code)}
+                break :x Term { .Exited = @bitCast(i32, exit_code)};
             }
         });
 
@@ -300,7 +300,7 @@ pub const ChildProcess = struct {
         defer {
             os.close(self.err_pipe[0]);
             os.close(self.err_pipe[1]);
-        };
+        }
 
         // Write @maxValue(ErrInt) to the write end of the err_pipe. This is after
         // waitpid, so this write is guaranteed to be after the child
@@ -319,15 +319,15 @@ pub const ChildProcess = struct {
     }
 
     fn statusToTerm(status: i32) -> Term {
-        return if (posix.WIFEXITED(status)) {
+        return if (posix.WIFEXITED(status))
             Term { .Exited = posix.WEXITSTATUS(status) }
-        } else if (posix.WIFSIGNALED(status)) {
+        else if (posix.WIFSIGNALED(status))
             Term { .Signal = posix.WTERMSIG(status) }
-        } else if (posix.WIFSTOPPED(status)) {
+        else if (posix.WIFSTOPPED(status))
             Term { .Stopped = posix.WSTOPSIG(status) }
-        } else {
+        else
             Term { .Unknown = status }
-        };
+        ;
     }
 
     fn spawnPosix(self: &ChildProcess) -> %void {
@@ -344,22 +344,22 @@ pub const ChildProcess = struct {
         %defer if (self.stderr_behavior == StdIo.Pipe) { destroyPipe(stderr_pipe); };
 
         const any_ignore = (self.stdin_behavior == StdIo.Ignore or self.stdout_behavior == StdIo.Ignore or self.stderr_behavior == StdIo.Ignore);
-        const dev_null_fd = if (any_ignore) {
+        const dev_null_fd = if (any_ignore)
             %return os.posixOpen("/dev/null", posix.O_RDWR, 0, null)
-        } else {
+        else
             undefined
-        };
-        defer { if (any_ignore) os.close(dev_null_fd); };
+        ;
+        defer { if (any_ignore) os.close(dev_null_fd); }
 
         var env_map_owned: BufMap = undefined;
         var we_own_env_map: bool = undefined;
-        const env_map = if (self.env_map) |env_map| {
+        const env_map = if (self.env_map) |env_map| x: {
             we_own_env_map = false;
-            env_map
-        } else {
+            break :x env_map;
+        } else x: {
             we_own_env_map = true;
             env_map_owned = %return os.getEnvMap(self.allocator);
-            &env_map_owned
+            break :x &env_map_owned;
         };
         defer { if (we_own_env_map) env_map_owned.deinit(); }
 
@@ -450,13 +450,13 @@ pub const ChildProcess = struct {
             self.stdout_behavior == StdIo.Ignore or
             self.stderr_behavior == StdIo.Ignore);
 
-        const nul_handle = if (any_ignore) {
+        const nul_handle = if (any_ignore)
             %return os.windowsOpen("NUL", windows.GENERIC_READ, windows.FILE_SHARE_READ,
                 windows.OPEN_EXISTING, windows.FILE_ATTRIBUTE_NORMAL, null)
-        } else {
+        else
             undefined
-        };
-        defer { if (any_ignore) os.close(nul_handle); };
+        ;
+        defer { if (any_ignore) os.close(nul_handle); }
         if (any_ignore) {
             %return windowsSetHandleInfo(nul_handle, windows.HANDLE_FLAG_INHERIT, 0);
         }
@@ -542,30 +542,30 @@ pub const ChildProcess = struct {
         };
         var piProcInfo: windows.PROCESS_INFORMATION = undefined;
 
-        const cwd_slice = if (self.cwd) |cwd| {
+        const cwd_slice = if (self.cwd) |cwd|
             %return cstr.addNullByte(self.allocator, cwd)
-        } else {
+        else
             null
-        };
+        ;
         defer if (cwd_slice) |cwd| self.allocator.free(cwd);
         const cwd_ptr = if (cwd_slice) |cwd| cwd.ptr else null;
 
-        const maybe_envp_buf = if (self.env_map) |env_map| {
+        const maybe_envp_buf = if (self.env_map) |env_map|
             %return os.createWindowsEnvBlock(self.allocator, env_map)
-        } else {
+        else
             null
-        };
+        ;
         defer if (maybe_envp_buf) |envp_buf| self.allocator.free(envp_buf);
         const envp_ptr = if (maybe_envp_buf) |envp_buf| envp_buf.ptr else null;
 
         // the cwd set in ChildProcess is in effect when choosing the executable path
         // to match posix semantics
-        const app_name = if (self.cwd) |cwd| {
+        const app_name = if (self.cwd) |cwd| x: {
             const resolved = %return os.path.resolve(self.allocator, cwd, self.argv[0]);
             defer self.allocator.free(resolved);
-            %return cstr.addNullByte(self.allocator, resolved)
-        } else {
-            %return cstr.addNullByte(self.allocator, self.argv[0])
+            break :x %return cstr.addNullByte(self.allocator, resolved);
+        } else x: {
+            break :x %return cstr.addNullByte(self.allocator, self.argv[0]);
         };
         defer self.allocator.free(app_name);
 
@@ -741,7 +741,7 @@ fn makePipe() -> %[2]i32 {
         return switch (err) {
             posix.EMFILE, posix.ENFILE => error.SystemResources,
             else => os.unexpectedErrorPosix(err),
-        }
+        };
     }
     return fds;
 }
@@ -800,10 +800,10 @@ fn handleTerm(pid: i32, status: i32) {
     }
 }
 
-const sigchld_set = {
+const sigchld_set = x: {
     var signal_set = posix.empty_sigset;
     posix.sigaddset(&signal_set, posix.SIGCHLD);
-    signal_set
+    break :x signal_set;
 };
 
 fn block_SIGCHLD() {
diff --git a/std/os/darwin.zig b/std/os/darwin.zig
index 9d80c6400..f4166c215 100644
--- a/std/os/darwin.zig
+++ b/std/os/darwin.zig
@@ -97,63 +97,63 @@ pub const SIGINFO   = 29; /// information request
 pub const SIGUSR1   = 30; /// user defined signal 1
 pub const SIGUSR2   = 31; /// user defined signal 2
 
-fn wstatus(x: i32) -> i32 { x & 0o177 }
+fn wstatus(x: i32) -> i32 { return x & 0o177; }
 const wstopped = 0o177;
-pub fn WEXITSTATUS(x: i32) -> i32 { x >> 8 }
-pub fn WTERMSIG(x: i32) -> i32 { wstatus(x) }
-pub fn WSTOPSIG(x: i32) -> i32 { x >> 8 }
-pub fn WIFEXITED(x: i32) -> bool { wstatus(x) == 0 }
-pub fn WIFSTOPPED(x: i32) -> bool { wstatus(x) == wstopped and WSTOPSIG(x) != 0x13 }
-pub fn WIFSIGNALED(x: i32) -> bool { wstatus(x) != wstopped and wstatus(x) != 0 }
+pub fn WEXITSTATUS(x: i32) -> i32 { return x >> 8; }
+pub fn WTERMSIG(x: i32) -> i32 { return wstatus(x); }
+pub fn WSTOPSIG(x: i32) -> i32 { return x >> 8; }
+pub fn WIFEXITED(x: i32) -> bool { return wstatus(x) == 0; }
+pub fn WIFSTOPPED(x: i32) -> bool { return wstatus(x) == wstopped and WSTOPSIG(x) != 0x13; }
+pub fn WIFSIGNALED(x: i32) -> bool { return wstatus(x) != wstopped and wstatus(x) != 0; }
 
 /// Get the errno from a syscall return value, or 0 for no error.
 pub fn getErrno(r: usize) -> usize {
     const signed_r = @bitCast(isize, r);
-    if (signed_r > -4096 and signed_r < 0) usize(-signed_r) else 0
+    return if (signed_r > -4096 and signed_r < 0) usize(-signed_r) else 0;
 }
 
 pub fn close(fd: i32) -> usize {
-    errnoWrap(c.close(fd))
+    return errnoWrap(c.close(fd));
 }
 
 pub fn abort() -> noreturn {
-    c.abort()
+    return c.abort();
 }
 
 pub fn exit(code: i32) -> noreturn {
-    c.exit(code)
+    return c.exit(code);
 }
 
 pub fn isatty(fd: i32) -> bool {
-    c.isatty(fd) != 0
+    return c.isatty(fd) != 0;
 }
 
 pub fn fstat(fd: i32, buf: &c.Stat) -> usize {
-    errnoWrap(c.@"fstat$INODE64"(fd, buf))
+    return errnoWrap(c.@"fstat$INODE64"(fd, buf));
 }
 
 pub fn lseek(fd: i32, offset: isize, whence: c_int) -> usize {
-    errnoWrap(c.lseek(fd, offset, whence))
+    return errnoWrap(c.lseek(fd, offset, whence));
 }
 
 pub fn open(path: &const u8, flags: u32, mode: usize) -> usize {
-    errnoWrap(c.open(path, @bitCast(c_int, flags), mode))
+    return errnoWrap(c.open(path, @bitCast(c_int, flags), mode));
 }
 
 pub fn raise(sig: i32) -> usize {
-    errnoWrap(c.raise(sig))
+    return errnoWrap(c.raise(sig));
 }
 
 pub fn read(fd: i32, buf: &u8, nbyte: usize) -> usize {
-    errnoWrap(c.read(fd, @ptrCast(&c_void, buf), nbyte))
+    return errnoWrap(c.read(fd, @ptrCast(&c_void, buf), nbyte));
 }
 
 pub fn stat(noalias path: &const u8, noalias buf: &stat) -> usize {
-    errnoWrap(c.stat(path, buf))
+    return errnoWrap(c.stat(path, buf));
 }
 
 pub fn write(fd: i32, buf: &const u8, nbyte: usize) -> usize {
-    errnoWrap(c.write(fd, @ptrCast(&const c_void, buf), nbyte))
+    return errnoWrap(c.write(fd, @ptrCast(&const c_void, buf), nbyte));
 }
 
 pub fn mmap(address: ?&u8, length: usize, prot: usize, flags: usize, fd: i32,
@@ -166,79 +166,79 @@ pub fn mmap(address: ?&u8, length: usize, prot: usize, flags: usize, fd: i32,
 }
 
 pub fn munmap(address: &u8, length: usize) -> usize {
-    errnoWrap(c.munmap(@ptrCast(&c_void, address), length))
+    return errnoWrap(c.munmap(@ptrCast(&c_void, address), length));
 }
 
 pub fn unlink(path: &const u8) -> usize {
-    errnoWrap(c.unlink(path))
+    return errnoWrap(c.unlink(path));
 }
 
 pub fn getcwd(buf: &u8, size: usize) -> usize {
-    if (c.getcwd(buf, size) == null) @bitCast(usize, -isize(*c._errno())) else 0
+    return if (c.getcwd(buf, size) == null) @bitCast(usize, -isize(*c._errno())) else 0;
 }
 
 pub fn waitpid(pid: i32, status: &i32, options: u32) -> usize {
     comptime assert(i32.bit_count == c_int.bit_count);
-    errnoWrap(c.waitpid(pid, @ptrCast(&c_int, status), @bitCast(c_int, options)))
+    return errnoWrap(c.waitpid(pid, @ptrCast(&c_int, status), @bitCast(c_int, options)));
 }
 
 pub fn fork() -> usize {
-    errnoWrap(c.fork())
+    return errnoWrap(c.fork());
 }
 
 pub fn pipe(fds: &[2]i32) -> usize {
     comptime assert(i32.bit_count == c_int.bit_count);
-    errnoWrap(c.pipe(@ptrCast(&c_int, fds)))
+    return errnoWrap(c.pipe(@ptrCast(&c_int, fds)));
 }
 
 pub fn mkdir(path: &const u8, mode: u32) -> usize {
-    errnoWrap(c.mkdir(path, mode))
+    return errnoWrap(c.mkdir(path, mode));
 }
 
 pub fn symlink(existing: &const u8, new: &const u8) -> usize {
-    errnoWrap(c.symlink(existing, new))
+    return errnoWrap(c.symlink(existing, new));
 }
 
 pub fn rename(old: &const u8, new: &const u8) -> usize {
-    errnoWrap(c.rename(old, new))
+    return errnoWrap(c.rename(old, new));
 }
 
 pub fn chdir(path: &const u8) -> usize {
-    errnoWrap(c.chdir(path))
+    return errnoWrap(c.chdir(path));
 }
 
 pub fn execve(path: &const u8, argv: &const ?&const u8, envp: &const ?&const u8)
     -> usize
 {
-    errnoWrap(c.execve(path, argv, envp))
+    return errnoWrap(c.execve(path, argv, envp));
 }
 
 pub fn dup2(old: i32, new: i32) -> usize {
-    errnoWrap(c.dup2(old, new))
+    return errnoWrap(c.dup2(old, new));
 }
 
 pub fn readlink(noalias path: &const u8, noalias buf_ptr: &u8, buf_len: usize) -> usize {
-    errnoWrap(c.readlink(path, buf_ptr, buf_len))
+    return errnoWrap(c.readlink(path, buf_ptr, buf_len));
 }
 
 pub fn nanosleep(req: &const timespec, rem: ?&timespec) -> usize {
-    errnoWrap(c.nanosleep(req, rem))
+    return errnoWrap(c.nanosleep(req, rem));
 }
 
 pub fn realpath(noalias filename: &const u8, noalias resolved_name: &u8) -> usize {
-    if (c.realpath(filename, resolved_name) == null) @bitCast(usize, -isize(*c._errno())) else 0
+    return if (c.realpath(filename, resolved_name) == null) @bitCast(usize, -isize(*c._errno())) else 0;
 }
 
 pub fn setreuid(ruid: u32, euid: u32) -> usize {
-    errnoWrap(c.setreuid(ruid, euid))
+    return errnoWrap(c.setreuid(ruid, euid));
 }
 
 pub fn setregid(rgid: u32, egid: u32) -> usize {
-    errnoWrap(c.setregid(rgid, egid))
+    return errnoWrap(c.setregid(rgid, egid));
 }
 
 pub fn sigprocmask(flags: u32, noalias set: &const sigset_t, noalias oldset: ?&sigset_t) -> usize {
-    errnoWrap(c.sigprocmask(@bitCast(c_int, flags), set, oldset))
+    return errnoWrap(c.sigprocmask(@bitCast(c_int, flags), set, oldset));
 }
 
 pub fn sigaction(sig: u5, noalias act: &const Sigaction, noalias oact: ?&Sigaction) -> usize {
@@ -285,9 +285,5 @@ pub fn sigaddset(set: &sigset_t, signo: u5) {
 /// that the kernel represents it to libc. Errno was a mistake, let's make
 /// it go away forever.
 fn errnoWrap(value: isize) -> usize {
-    @bitCast(usize, if (value == -1) {
-        -isize(*c._errno())
-    } else {
-        value
-    })
+    return @bitCast(usize, if (value == -1) -isize(*c._errno()) else value);
 }
diff --git a/std/os/index.zig b/std/os/index.zig
index 3eba15ef8..09109c324 100644
--- a/std/os/index.zig
+++ b/std/os/index.zig
@@ -84,7 +84,7 @@ pub fn getRandomBytes(buf: []u8) -> %void {
                     posix.EFAULT => unreachable,
                     posix.EINTR  => continue,
                     else         => unexpectedErrorPosix(err),
-                }
+                };
             }
             return;
         },
@@ -151,18 +151,17 @@ pub coldcc fn exit(status: i32) -> noreturn {
     }
     switch (builtin.os) {
         Os.linux, Os.darwin, Os.macosx, Os.ios => {
-            posix.exit(status)
+            posix.exit(status);
         },
         Os.windows => {
             // Map a possibly negative status code to a non-negative status for the systems default
             // integer width.
-            const p_status = if (@sizeOf(c_uint) < @sizeOf(u32)) {
+            const p_status = if (@sizeOf(c_uint) < @sizeOf(u32))
                 @truncate(c_uint, @bitCast(u32, status))
-            } else {
-                c_uint(@bitCast(u32, status))
-            };
+            else
+                c_uint(@bitCast(u32, status));
 
-            windows.ExitProcess(p_status)
+            windows.ExitProcess(p_status);
         },
         else => @compileError("Unsupported OS"),
     }
@@ -289,7 +288,7 @@ pub fn posixOpen(file_path: []const u8, flags: u32, perm: usize, allocator: ?&Al
                 posix.EPERM => error.AccessDenied,
                 posix.EEXIST => error.PathAlreadyExists,
                 else => unexpectedErrorPosix(err),
-            }
+            };
         }
         return i32(result);
     }
@@ -680,7 +679,7 @@ pub fn deleteFileWindows(allocator: &Allocator, file_path: []const u8) -> %void
             windows.ERROR.ACCESS_DENIED => error.AccessDenied,
             windows.ERROR.FILENAME_EXCED_RANGE, windows.ERROR.INVALID_PARAMETER => error.NameTooLong,
             else => unexpectedErrorWindows(err),
-        }
+        };
     }
 }
 
@@ -1006,7 +1005,7 @@ pub const Dir = struct {
                                 continue;
                             },
                             else => return unexpectedErrorPosix(err),
-                        };
+                        }
                     }
                     if (result == 0)
                         return null;
diff --git a/std/os/linux.zig b/std/os/linux.zig
index 4ba4db603..f9baa4309 100644
--- a/std/os/linux.zig
+++ b/std/os/linux.zig
@@ -367,14 +367,14 @@ pub const TFD_CLOEXEC = O_CLOEXEC;
 pub const TFD_TIMER_ABSTIME = 1;
 pub const TFD_TIMER_CANCEL_ON_SET = (1 << 1);
 
-fn unsigned(s: i32) -> u32 { @bitCast(u32, s) }
-fn signed(s: u32) -> i32 { @bitCast(i32, s) }
-pub fn WEXITSTATUS(s: i32) -> i32 { signed((unsigned(s) & 0xff00) >> 8) }
-pub fn WTERMSIG(s: i32) -> i32 { signed(unsigned(s) & 0x7f) }
-pub fn WSTOPSIG(s: i32) -> i32 { WEXITSTATUS(s) }
-pub fn WIFEXITED(s: i32) -> bool { WTERMSIG(s) == 0 }
-pub fn WIFSTOPPED(s: i32) -> bool { (u16)(((unsigned(s)&0xffff)*%0x10001)>>8) > 0x7f00 }
-pub fn WIFSIGNALED(s: i32) -> bool { (unsigned(s)&0xffff)-%1 < 0xff }
+fn unsigned(s: i32) -> u32 { return @bitCast(u32, s); }
+fn signed(s: u32) -> i32 { return @bitCast(i32, s); }
+pub fn WEXITSTATUS(s: i32) -> i32 { return signed((unsigned(s) & 0xff00) >> 8); }
+pub fn WTERMSIG(s: i32) -> i32 { return signed(unsigned(s) & 0x7f); }
+pub fn WSTOPSIG(s: i32) -> i32 { return WEXITSTATUS(s); }
+pub fn WIFEXITED(s: i32) -> bool { return WTERMSIG(s) == 0; }
+pub fn WIFSTOPPED(s: i32) -> bool { return (u16)(((unsigned(s)&0xffff)*%0x10001)>>8) > 0x7f00; }
+pub fn WIFSIGNALED(s: i32) -> bool { return (unsigned(s)&0xffff)-%1 < 0xff; }
 
 
 pub const winsize = extern struct {
@@ -387,31 +387,31 @@ pub const winsize = extern struct {
 /// Get the errno from a syscall return value, or 0 for no error.
 pub fn getErrno(r: usize) -> usize {
     const signed_r = @bitCast(isize, r);
-    if (signed_r > -4096 and signed_r < 0) usize(-signed_r) else 0
+    return if (signed_r > -4096 and signed_r < 0) usize(-signed_r) else 0;
 }
 
 pub fn dup2(old: i32, new: i32) -> usize {
-    arch.syscall2(arch.SYS_dup2, usize(old), usize(new))
+    return arch.syscall2(arch.SYS_dup2, usize(old), usize(new));
 }
 
 pub fn chdir(path: &const u8) -> usize {
-    arch.syscall1(arch.SYS_chdir, @ptrToInt(path))
+    return arch.syscall1(arch.SYS_chdir, @ptrToInt(path));
 }
 
 pub fn execve(path: &const u8, argv: &const ?&const u8, envp: &const ?&const u8) -> usize {
-    arch.syscall3(arch.SYS_execve, @ptrToInt(path), @ptrToInt(argv), @ptrToInt(envp))
+    return arch.syscall3(arch.SYS_execve, @ptrToInt(path), @ptrToInt(argv), @ptrToInt(envp));
 }
 
 pub fn fork() -> usize {
-    arch.syscall0(arch.SYS_fork)
+    return arch.syscall0(arch.SYS_fork);
 }
 
 pub fn getcwd(buf: &u8, size: usize) -> usize {
-    arch.syscall2(arch.SYS_getcwd, @ptrToInt(buf), size)
+    return arch.syscall2(arch.SYS_getcwd, @ptrToInt(buf), size);
 }
 
 pub fn getdents(fd: i32, dirp: &u8, count: usize) -> usize {
-    arch.syscall3(arch.SYS_getdents, usize(fd), @ptrToInt(dirp), count)
+    return arch.syscall3(arch.SYS_getdents, usize(fd), @ptrToInt(dirp), count);
 }
 
 pub fn isatty(fd: i32) -> bool {
@@ -420,123 +420,123 @@ pub fn isatty(fd: i32) -> bool {
 }
 
 pub fn readlink(noalias path: &const u8, noalias buf_ptr: &u8, buf_len: usize) -> usize {
-    arch.syscall3(arch.SYS_readlink, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len)
+    return arch.syscall3(arch.SYS_readlink, @ptrToInt(path), @ptrToInt(buf_ptr), buf_len);
 }
 
 pub fn mkdir(path: &const u8, mode: u32) -> usize {
-    arch.syscall2(arch.SYS_mkdir, @ptrToInt(path), mode)
+    return arch.syscall2(arch.SYS_mkdir, @ptrToInt(path), mode);
 }
 
 pub fn mmap(address: ?&u8, length: usize, prot: usize, flags: usize, fd: i32, offset: isize)
     -> usize
 {
-    arch.syscall6(arch.SYS_mmap, @ptrToInt(address), length, prot, flags, usize(fd),
-        @bitCast(usize, offset))
+    return arch.syscall6(arch.SYS_mmap, @ptrToInt(address), length, prot, flags, usize(fd),
+        @bitCast(usize, offset));
 }
 
 pub fn munmap(address: &u8, length: usize) -> usize {
-    arch.syscall2(arch.SYS_munmap, @ptrToInt(address), length)
+    return arch.syscall2(arch.SYS_munmap, @ptrToInt(address), length);
 }
 
 pub fn read(fd: i32, buf: &u8, count: usize) -> usize {
-    arch.syscall3(arch.SYS_read, usize(fd), @ptrToInt(buf), count)
+    return arch.syscall3(arch.SYS_read, usize(fd), @ptrToInt(buf), count);
 }
 
 pub fn rmdir(path: &const u8) -> usize {
-    arch.syscall1(arch.SYS_rmdir, @ptrToInt(path))
+    return arch.syscall1(arch.SYS_rmdir, @ptrToInt(path));
 }
 
 pub fn symlink(existing: &const u8, new: &const u8) -> usize {
-    arch.syscall2(arch.SYS_symlink, @ptrToInt(existing), @ptrToInt(new))
+    return arch.syscall2(arch.SYS_symlink, @ptrToInt(existing), @ptrToInt(new));
 }
 
 pub fn pread(fd: i32, buf: &u8, count: usize, offset: usize) -> usize {
-    arch.syscall4(arch.SYS_pread, usize(fd), @ptrToInt(buf), count, offset)
+    return arch.syscall4(arch.SYS_pread, usize(fd), @ptrToInt(buf), count, offset);
 }
 
 pub fn pipe(fd: &[2]i32) -> usize {
-    pipe2(fd, 0)
+    return pipe2(fd, 0);
 }
 
 pub fn pipe2(fd: &[2]i32, flags: usize) -> usize {
-    arch.syscall2(arch.SYS_pipe2, @ptrToInt(fd), flags)
+    return arch.syscall2(arch.SYS_pipe2, @ptrToInt(fd), flags);
 }
 
 pub fn write(fd: i32, buf: &const u8, count: usize) -> usize {
-    arch.syscall3(arch.SYS_write, usize(fd), @ptrToInt(buf), count)
+    return arch.syscall3(arch.SYS_write, usize(fd), @ptrToInt(buf), count);
 }
 
 pub fn pwrite(fd: i32, buf: &const u8, count: usize, offset: usize) -> usize {
-    arch.syscall4(arch.SYS_pwrite, usize(fd), @ptrToInt(buf), count, offset)
+    return arch.syscall4(arch.SYS_pwrite, usize(fd), @ptrToInt(buf), count, offset);
 }
 
 pub fn rename(old: &const u8, new: &const u8) -> usize {
-    arch.syscall2(arch.SYS_rename, @ptrToInt(old), @ptrToInt(new))
+    return arch.syscall2(arch.SYS_rename, @ptrToInt(old), @ptrToInt(new));
 }
 
 pub fn open(path: &const u8, flags: u32, perm: usize) -> usize {
-    arch.syscall3(arch.SYS_open, @ptrToInt(path), flags, perm)
+    return arch.syscall3(arch.SYS_open, @ptrToInt(path), flags, perm);
 }
 
 pub fn create(path: &const u8, perm: usize) -> usize {
-    arch.syscall2(arch.SYS_creat, @ptrToInt(path), perm)
+    return arch.syscall2(arch.SYS_creat, @ptrToInt(path), perm);
 }
 
 pub fn openat(dirfd: i32, path: &const u8, flags: usize, mode: usize) -> usize {
-    arch.syscall4(arch.SYS_openat, usize(dirfd), @ptrToInt(path), flags, mode)
+    return arch.syscall4(arch.SYS_openat, usize(dirfd), @ptrToInt(path), flags, mode);
 }
 
 pub fn close(fd: i32) -> usize {
-    arch.syscall1(arch.SYS_close, usize(fd))
+    return arch.syscall1(arch.SYS_close, usize(fd));
 }
 
 pub fn lseek(fd: i32, offset: isize, ref_pos: usize) -> usize {
-    arch.syscall3(arch.SYS_lseek, usize(fd), @bitCast(usize, offset), ref_pos)
+    return arch.syscall3(arch.SYS_lseek, usize(fd), @bitCast(usize, offset), ref_pos);
 }
 
 pub fn exit(status: i32) -> noreturn {
     _ = arch.syscall1(arch.SYS_exit, @bitCast(usize, isize(status)));
-    unreachable
+    unreachable;
 }
 
 pub fn getrandom(buf: &u8, count: usize, flags: u32) -> usize {
-    arch.syscall3(arch.SYS_getrandom, @ptrToInt(buf), count, usize(flags))
+    return arch.syscall3(arch.SYS_getrandom, @ptrToInt(buf), count, usize(flags));
 }
 
 pub fn kill(pid: i32, sig: i32) -> usize {
-    arch.syscall2(arch.SYS_kill, @bitCast(usize, isize(pid)), usize(sig))
+    return arch.syscall2(arch.SYS_kill, @bitCast(usize, isize(pid)), usize(sig));
 }
 
 pub fn unlink(path: &const u8) -> usize {
-    arch.syscall1(arch.SYS_unlink, @ptrToInt(path))
+    return arch.syscall1(arch.SYS_unlink, @ptrToInt(path));
 }
 
 pub fn waitpid(pid: i32, status: &i32, options: i32) -> usize {
-    arch.syscall4(arch.SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), @bitCast(usize, isize(options)), 0)
+    return arch.syscall4(arch.SYS_wait4, @bitCast(usize, isize(pid)), @ptrToInt(status), @bitCast(usize, isize(options)), 0);
 }
 
 pub fn nanosleep(req: &const timespec, rem: ?&timespec) -> usize {
-    arch.syscall2(arch.SYS_nanosleep, @ptrToInt(req), @ptrToInt(rem))
+    return arch.syscall2(arch.SYS_nanosleep, @ptrToInt(req), @ptrToInt(rem));
 }
 
 pub fn setuid(uid: u32) -> usize {
-    arch.syscall1(arch.SYS_setuid, uid)
+    return arch.syscall1(arch.SYS_setuid, uid);
 }
 
 pub fn setgid(gid: u32) -> usize {
-    arch.syscall1(arch.SYS_setgid, gid)
+    return arch.syscall1(arch.SYS_setgid, gid);
 }
 
 pub fn setreuid(ruid: u32, euid: u32) -> usize {
-    arch.syscall2(arch.SYS_setreuid, ruid, euid)
+    return arch.syscall2(arch.SYS_setreuid, ruid, euid);
 }
 
 pub fn setregid(rgid: u32, egid: u32) -> usize {
-    arch.syscall2(arch.SYS_setregid, rgid, egid)
+    return arch.syscall2(arch.SYS_setregid, rgid, egid);
 }
 
 pub fn sigprocmask(flags: u32, noalias set: &const sigset_t, noalias oldset: ?&sigset_t) -> usize {
-    arch.syscall4(arch.SYS_rt_sigprocmask, flags, @ptrToInt(set), @ptrToInt(oldset), NSIG/8)
+    return arch.syscall4(arch.SYS_rt_sigprocmask, flags, @ptrToInt(set), @ptrToInt(oldset), NSIG/8);
 }
 
 pub fn sigaction(sig: u6, noalias act: &const Sigaction, noalias oact: ?&Sigaction) -> usize {
@@ -652,69 +652,69 @@ pub const iovec = extern struct {
 };
 
 pub fn getsockname(fd: i32, noalias addr: &sockaddr, noalias len: &socklen_t) -> usize {
-    arch.syscall3(arch.SYS_getsockname, usize(fd), @ptrToInt(addr), @ptrToInt(len))
+    return arch.syscall3(arch.SYS_getsockname, usize(fd), @ptrToInt(addr), @ptrToInt(len));
 }
 
 pub fn getpeername(fd: i32, noalias addr: &sockaddr, noalias len: &socklen_t) -> usize {
-    arch.syscall3(arch.SYS_getpeername, usize(fd), @ptrToInt(addr), @ptrToInt(len))
+    return arch.syscall3(arch.SYS_getpeername, usize(fd), @ptrToInt(addr), @ptrToInt(len));
 }
 
 pub fn socket(domain: i32, socket_type: i32, protocol: i32) -> usize {
-    arch.syscall3(arch.SYS_socket, usize(domain), usize(socket_type), usize(protocol))
+    return arch.syscall3(arch.SYS_socket, usize(domain), usize(socket_type), usize(protocol));
 }
 
 pub fn setsockopt(fd: i32, level: i32, optname: i32, optval: &const u8, optlen: socklen_t) -> usize {
-    arch.syscall5(arch.SYS_setsockopt, usize(fd), usize(level), usize(optname), usize(optval), @ptrToInt(optlen))
+    return arch.syscall5(arch.SYS_setsockopt, usize(fd), usize(level), usize(optname), usize(optval), @ptrToInt(optlen));
 }
 
 pub fn getsockopt(fd: i32, level: i32, optname: i32, noalias optval: &u8, noalias optlen: &socklen_t) -> usize {
-    arch.syscall5(arch.SYS_getsockopt, usize(fd), usize(level), usize(optname), @ptrToInt(optval), @ptrToInt(optlen))
+    return arch.syscall5(arch.SYS_getsockopt, usize(fd), usize(level), usize(optname), @ptrToInt(optval), @ptrToInt(optlen));
 }
 
 pub fn sendmsg(fd: i32, msg: &const arch.msghdr, flags: u32) -> usize {
-    arch.syscall3(arch.SYS_sendmsg, usize(fd), @ptrToInt(msg), flags)
+    return arch.syscall3(arch.SYS_sendmsg, usize(fd), @ptrToInt(msg), flags);
 }
 
 pub fn connect(fd: i32, addr: &const sockaddr, len: socklen_t) -> usize {
-    arch.syscall3(arch.SYS_connect, usize(fd), @ptrToInt(addr), usize(len))
+    return arch.syscall3(arch.SYS_connect, usize(fd), @ptrToInt(addr), usize(len));
 }
 
 pub fn recvmsg(fd: i32, msg: &arch.msghdr, flags: u32) -> usize {
-    arch.syscall3(arch.SYS_recvmsg, usize(fd), @ptrToInt(msg), flags)
+    return arch.syscall3(arch.SYS_recvmsg, usize(fd), @ptrToInt(msg), flags);
 }
 
 pub fn recvfrom(fd: i32, noalias buf: &u8, len: usize, flags: u32,
     noalias addr: ?&sockaddr, noalias alen: ?&socklen_t) -> usize
 {
-    arch.syscall6(arch.SYS_recvfrom, usize(fd), @ptrToInt(buf), len, flags, @ptrToInt(addr), @ptrToInt(alen))
+    return arch.syscall6(arch.SYS_recvfrom, usize(fd), @ptrToInt(buf), len, flags, @ptrToInt(addr), @ptrToInt(alen));
 }
 
 pub fn shutdown(fd: i32, how: i32) -> usize {
-    arch.syscall2(arch.SYS_shutdown, usize(fd), usize(how))
+    return arch.syscall2(arch.SYS_shutdown, usize(fd), usize(how));
 }
 
 pub fn bind(fd: i32, addr: &const sockaddr, len: socklen_t) -> usize {
-    arch.syscall3(arch.SYS_bind, usize(fd), @ptrToInt(addr), usize(len))
+    return arch.syscall3(arch.SYS_bind, usize(fd), @ptrToInt(addr), usize(len));
 }
 
 pub fn listen(fd: i32, backlog: i32) -> usize {
-    arch.syscall2(arch.SYS_listen, usize(fd), usize(backlog))
+    return arch.syscall2(arch.SYS_listen, usize(fd), usize(backlog));
 }
 
 pub fn sendto(fd: i32, buf: &const u8, len: usize, flags: u32, addr: ?&const sockaddr, alen: socklen_t) -> usize {
-    arch.syscall6(arch.SYS_sendto, usize(fd), @ptrToInt(buf), len, flags, @ptrToInt(addr), usize(alen))
+    return arch.syscall6(arch.SYS_sendto, usize(fd), @ptrToInt(buf), len, flags, @ptrToInt(addr), usize(alen));
 }
 
 pub fn socketpair(domain: i32, socket_type: i32, protocol: i32, fd: [2]i32) -> usize {
-    arch.syscall4(arch.SYS_socketpair, usize(domain), usize(socket_type), usize(protocol), @ptrToInt(&fd[0]))
+    return arch.syscall4(arch.SYS_socketpair, usize(domain), usize(socket_type), usize(protocol), @ptrToInt(&fd[0]));
 }
 
 pub fn accept(fd: i32, noalias addr: &sockaddr, noalias len: &socklen_t) -> usize {
-    accept4(fd, addr, len, 0)
+    return accept4(fd, addr, len, 0);
 }
 
 pub fn accept4(fd: i32, noalias addr: &sockaddr, noalias len: &socklen_t, flags: u32) -> usize {
-    arch.syscall4(arch.SYS_accept4, usize(fd), @ptrToInt(addr), @ptrToInt(len), flags)
+    return arch.syscall4(arch.SYS_accept4, usize(fd), @ptrToInt(addr), @ptrToInt(len), flags);
 }
 
 // error NameTooLong;
@@ -749,7 +749,7 @@ pub const Stat = arch.Stat;
 pub const timespec = arch.timespec;
 
 pub fn fstat(fd: i32, stat_buf: &Stat) -> usize {
-    arch.syscall2(arch.SYS_fstat, usize(fd), @ptrToInt(stat_buf))
+    return arch.syscall2(arch.SYS_fstat, usize(fd), @ptrToInt(stat_buf));
 }
 
 pub const epoll_data = u64;
@@ -760,19 +760,19 @@ pub const epoll_event = extern struct {
 };
 
 pub fn epoll_create() -> usize {
-    arch.syscall1(arch.SYS_epoll_create, usize(1))
+    return arch.syscall1(arch.SYS_epoll_create, usize(1));
 }
 
 pub fn epoll_ctl(epoll_fd: i32, op: i32, fd: i32, ev: &epoll_event) -> usize {
-    arch.syscall4(arch.SYS_epoll_ctl, usize(epoll_fd), usize(op), usize(fd), @ptrToInt(ev))
+    return arch.syscall4(arch.SYS_epoll_ctl, usize(epoll_fd), usize(op), usize(fd), @ptrToInt(ev));
 }
 
 pub fn epoll_wait(epoll_fd: i32, events: &epoll_event, maxevents: i32, timeout: i32) -> usize {
-    arch.syscall4(arch.SYS_epoll_wait, usize(epoll_fd), @ptrToInt(events), usize(maxevents), usize(timeout))
+    return arch.syscall4(arch.SYS_epoll_wait, usize(epoll_fd), @ptrToInt(events), usize(maxevents), usize(timeout));
 }
 
 pub fn timerfd_create(clockid: i32, flags: u32) -> usize {
-    arch.syscall2(arch.SYS_timerfd_create, usize(clockid), usize(flags))
+    return arch.syscall2(arch.SYS_timerfd_create, usize(clockid), usize(flags));
 }
 
 pub const itimerspec = extern struct {
@@ -781,11 +781,11 @@ pub const itimerspec = extern struct {
 };
 
 pub fn timerfd_gettime(fd: i32, curr_value: &itimerspec) -> usize {
-    arch.syscall2(arch.SYS_timerfd_gettime, usize(fd), @ptrToInt(curr_value))
+    return arch.syscall2(arch.SYS_timerfd_gettime, usize(fd), @ptrToInt(curr_value));
 }
 
 pub fn timerfd_settime(fd: i32, flags: u32, new_value: &const itimerspec, old_value: ?&itimerspec) -> usize {
-    arch.syscall4(arch.SYS_timerfd_settime, usize(fd), usize(flags), @ptrToInt(new_value), @ptrToInt(old_value))
+    return arch.syscall4(arch.SYS_timerfd_settime, usize(fd), usize(flags), @ptrToInt(new_value), @ptrToInt(old_value));
 }
 
 test "import linux_test" {
diff --git a/std/os/linux_x86_64.zig b/std/os/linux_x86_64.zig
index 6c94528df..db78decde 100644
--- a/std/os/linux_x86_64.zig
+++ b/std/os/linux_x86_64.zig
@@ -371,52 +371,52 @@ pub const F_GETOWN_EX = 16;
 pub const F_GETOWNER_UIDS = 17;
 
 pub fn syscall0(number: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall1(number: usize, arg1: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall2(number: usize, arg1: usize, arg2: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1),
             [arg2] "{rsi}" (arg2)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall3(number: usize, arg1: usize, arg2: usize, arg3: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1),
             [arg2] "{rsi}" (arg2),
             [arg3] "{rdx}" (arg3)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall4(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1),
             [arg2] "{rsi}" (arg2),
             [arg3] "{rdx}" (arg3),
             [arg4] "{r10}" (arg4)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize, arg5: usize) -> usize {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1),
@@ -424,13 +424,13 @@ pub fn syscall5(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
             [arg3] "{rdx}" (arg3),
             [arg4] "{r10}" (arg4),
             [arg5] "{r8}" (arg5)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub fn syscall6(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usize,
     arg5: usize, arg6: usize) -> usize
 {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         : [ret] "={rax}" (-> usize)
         : [number] "{rax}" (number),
             [arg1] "{rdi}" (arg1),
@@ -439,14 +439,14 @@ pub fn syscall6(number: usize, arg1: usize, arg2: usize, arg3: usize, arg4: usiz
             [arg4] "{r10}" (arg4),
             [arg5] "{r8}" (arg5),
             [arg6] "{r9}" (arg6)
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 pub nakedcc fn restore_rt() {
-    asm volatile ("syscall"
+    return asm volatile ("syscall"
         :
         : [number] "{rax}" (usize(SYS_rt_sigreturn))
-        : "rcx", "r11")
+        : "rcx", "r11");
 }
 
 
diff --git a/std/os/path.zig b/std/os/path.zig
index 3fd7b5e2d..a42ebb343 100644
--- a/std/os/path.zig
+++ b/std/os/path.zig
@@ -749,21 +749,19 @@ pub fn relativeWindows(allocator: &Allocator, from: []const u8, to: []const u8)
     const resolved_to = %return resolveWindows(allocator, [][]const u8{to});
     defer if (clean_up_resolved_to) allocator.free(resolved_to);
 
-    const result_is_to = if (drive(resolved_to)) |to_drive| {
-        if (drive(resolved_from)) |from_drive| {
+    const result_is_to = if (drive(resolved_to)) |to_drive|
+        if (drive(resolved_from)) |from_drive|
             asciiUpper(from_drive[0]) != asciiUpper(to_drive[0])
-        } else {
+        else
             true
-        }
-    } else if (networkShare(resolved_to)) |to_ns| {
-        if (networkShare(resolved_from)) |from_ns| {
+    else if (networkShare(resolved_to)) |to_ns|
+        if (networkShare(resolved_from)) |from_ns|
             !networkShareServersEql(to_ns, from_ns)
-        } else {
+        else
             true
-        }
-    } else {
-        unreachable
-    };
+    else
+        unreachable;
+
     if (result_is_to) {
         clean_up_resolved_to = false;
         return resolved_to;
@@ -964,14 +962,16 @@ pub fn real(allocator: &Allocator, pathname: []const u8) -> %[]u8 {
 
                 // windows returns \\?\ prepended to the path
                 // we strip it because nobody wants \\?\ prepended to their path
-                const final_len = if (result > 4 and mem.startsWith(u8, buf, "\\\\?\\")) {
-                    var i: usize = 4;
-                    while (i < result) : (i += 1) {
-                        buf[i - 4] = buf[i];
+                const final_len = x: {
+                    if (result > 4 and mem.startsWith(u8, buf, "\\\\?\\")) {
+                        var i: usize = 4;
+                        while (i < result) : (i += 1) {
+                            buf[i - 4] = buf[i];
+                        }
+                        break :x result - 4;
+                    } else {
+                        break :x result;
                     }
-                    result - 4
-                } else {
-                    result
                 };
 
                 return allocator.shrink(u8, buf, final_len);
diff --git a/std/os/windows/util.zig b/std/os/windows/util.zig
index b3fc095d4..0964adc16 100644
--- a/std/os/windows/util.zig
+++ b/std/os/windows/util.zig
@@ -122,7 +122,7 @@ pub fn windowsOpen(file_path: []const u8, desired_access: windows.DWORD, share_m
 /// Caller must free result.
 pub fn createWindowsEnvBlock(allocator: &mem.Allocator, env_map: &const BufMap) -> %[]u8 {
     // count bytes needed
-    const bytes_needed = {
+    const bytes_needed = x: {
         var bytes_needed: usize = 1; // 1 for the final null byte
         var it = env_map.iterator();
         while (it.next()) |pair| {
@@ -130,7 +130,7 @@ pub fn createWindowsEnvBlock(allocator: &mem.Allocator, env_map: &const BufMap)
             // +1 for null byte
             bytes_needed += pair.key.len + pair.value.len + 2;
         }
-        bytes_needed
+        break :x bytes_needed;
     };
     const result = %return allocator.alloc(u8, bytes_needed);
     %defer allocator.free(result);
diff --git a/std/rand.zig b/std/rand.zig
index 09e0c8ac7..73801a078 100644
--- a/std/rand.zig
+++ b/std/rand.zig
@@ -28,9 +28,9 @@ pub const Rand = struct {
 
     /// Initialize random state with the given seed.
     pub fn init(seed: usize) -> Rand {
-        Rand {
+        return Rand {
             .rng = Rng.init(seed),
-        }
+        };
     }
 
     /// Get an integer or boolean with random bits.
@@ -78,13 +78,13 @@ pub const Rand = struct {
                 const end_uint = uint(end);
                 const total_range = math.absCast(start) + end_uint;
                 const value = r.range(uint, 0, total_range);
-                const result = if (value < end_uint) {
-                    T(value)
-                } else if (value == end_uint) {
-                    start
-                } else {
+                const result = if (value < end_uint) x: {
+                    break :x T(value);
+                } else if (value == end_uint) x: {
+                    break :x start;
+                } else x: {
                     // Can't overflow because the range is over signed ints
-                    %%math.negateCast(value - end_uint)
+                    break :x %%math.negateCast(value - end_uint);
                 };
                 return result;
             } else {
@@ -114,13 +114,13 @@ pub const Rand = struct {
         // const rand_bits = r.rng.scalar(int) & mask;
         // return @float_compose(T, false, 0, rand_bits) - 1.0
         const int_type = @IntType(false, @sizeOf(T) * 8);
-        const precision = if (T == f32) {
+        const precision = if (T == f32)
             16777216
-        } else if (T == f64) {
+        else if (T == f64)
             9007199254740992
-        } else {
+        else
             @compileError("unknown floating point type")
-        };
+        ;
         return T(r.range(int_type, 0, precision)) / T(precision);
     }
 };
@@ -133,7 +133,7 @@ fn MersenneTwister(
     comptime t: math.Log2Int(int), comptime c: int,
     comptime l: math.Log2Int(int), comptime f: int) -> type
 {
-    struct {
+    return struct {
         const Self = this;
 
         array: [n]int,
@@ -189,7 +189,7 @@ fn MersenneTwister(
 
             return x;
         }
-    }
+    };
 }
 
 test "rand float 32" {
diff --git a/std/sort.zig b/std/sort.zig
index c6b1500b8..a36a5e174 100644
--- a/std/sort.zig
+++ b/std/sort.zig
@@ -355,7 +355,7 @@ pub fn sort(comptime T: type, items: []T, lessThan: fn(lhs: &const T, rhs: &cons
                 // these values will be pulled out to the start of A
                 last = A.start;
                 count = 1;
-                while (count < find) : ({last = index; count += 1}) {
+                while (count < find) : ({last = index; count += 1;}) {
                     index = findLastForward(T, items, items[last], Range.init(last + 1, A.end), lessThan, find - count);
                     if (index == A.end) break;
                 }
@@ -410,7 +410,7 @@ pub fn sort(comptime T: type, items: []T, lessThan: fn(lhs: &const T, rhs: &cons
                 // these values will be pulled out to the end of B
                 last = B.end - 1;
                 count = 1;
-                while (count < find) : ({last = index - 1; count += 1}) {
+                while (count < find) : ({last = index - 1; count += 1;}) {
                     index = findFirstBackward(T, items, items[last], Range.init(B.start, last), lessThan, find - count);
                     if (index == B.start) break;
                 }
@@ -547,7 +547,7 @@ pub fn sort(comptime T: type, items: []T, lessThan: fn(lhs: &const T, rhs: &cons
                     // swap the first value of each A block with the value in buffer1
                     var indexA = buffer1.start;
                     index = firstA.end;
-                    while (index < blockA.end) : ({indexA += 1; index += block_size}) {
+                    while (index < blockA.end) : ({indexA += 1; index += block_size;}) {
                         mem.swap(T, &items[indexA], &items[index]);
                     }
                     
@@ -1093,7 +1093,7 @@ test "another sort case" {
     var arr = []i32{ 5, 3, 1, 2, 4 };
     sort(i32, arr[0..], i32asc);
 
-    assert(mem.eql(i32, arr, []i32{ 1, 2, 3, 4, 5 }))
+    assert(mem.eql(i32, arr, []i32{ 1, 2, 3, 4, 5 }));
 }
 
 test "sort fuzz testing" {
diff --git a/std/special/build_runner.zig b/std/special/build_runner.zig
index 430eeb395..e54d85e6e 100644
--- a/std/special/build_runner.zig
+++ b/std/special/build_runner.zig
@@ -45,21 +45,17 @@ pub fn main() -> %void {
 
     var stderr_file = io.getStdErr();
     var stderr_file_stream: io.FileOutStream = undefined;
-    var stderr_stream: %&io.OutStream = if (stderr_file) |*f| {
+    var stderr_stream: %&io.OutStream = if (stderr_file) |*f| x: {
         stderr_file_stream = io.FileOutStream.init(f);
-        &stderr_file_stream.stream
-    } else |err| {
-        err
-    };
+        break :x &stderr_file_stream.stream;
+    } else |err| err;
 
     var stdout_file = io.getStdOut();
     var stdout_file_stream: io.FileOutStream = undefined;
-    var stdout_stream: %&io.OutStream = if (stdout_file) |*f| {
+    var stdout_stream: %&io.OutStream = if (stdout_file) |*f| x: {
         stdout_file_stream = io.FileOutStream.init(f);
-        &stdout_file_stream.stream
-    } else |err| {
-        err
-    };
+        break :x &stdout_file_stream.stream;
+    } else |err| err;
 
     while (arg_it.next(allocator)) |err_or_arg| {
         const arg = %return unwrapArg(err_or_arg);
diff --git a/std/special/builtin.zig b/std/special/builtin.zig
index a2455a969..e6c09863c 100644
--- a/std/special/builtin.zig
+++ b/std/special/builtin.zig
@@ -46,15 +46,15 @@ extern fn __stack_chk_fail() -> noreturn {
 
 const math = @import("../math/index.zig");
 
-export fn fmodf(x: f32, y: f32) -> f32 { generic_fmod(f32, x, y) }
-export fn fmod(x: f64, y: f64) -> f64 { generic_fmod(f64, x, y) }
+export fn fmodf(x: f32, y: f32) -> f32 { return generic_fmod(f32, x, y); }
+export fn fmod(x: f64, y: f64) -> f64 { return generic_fmod(f64, x, y); }
 
 // TODO add intrinsics for these (and probably the double version too)
 // and have the math stuff use the intrinsic. same as @mod and @rem
-export fn floorf(x: f32) -> f32 { math.floor(x) }
-export fn ceilf(x: f32) -> f32 { math.ceil(x) }
-export fn floor(x: f64) -> f64 { math.floor(x) }
-export fn ceil(x: f64) -> f64 { math.ceil(x) }
+export fn floorf(x: f32) -> f32 { return math.floor(x); }
+export fn ceilf(x: f32) -> f32 { return math.ceil(x); }
+export fn floor(x: f64) -> f64 { return math.floor(x); }
+export fn ceil(x: f64) -> f64 { return math.ceil(x); }
 
 fn generic_fmod(comptime T: type, x: T, y: T) -> T {
     @setDebugSafety(this, false);
@@ -84,7 +84,7 @@ fn generic_fmod(comptime T: type, x: T, y: T) -> T {
     // normalize x and y
     if (ex == 0) {
         i = ux << exp_bits;
-        while (i >> bits_minus_1 == 0) : ({ex -= 1; i <<= 1}) {}
+        while (i >> bits_minus_1 == 0) : (b: {ex -= 1; break :b i <<= 1;}) {}
         ux <<= log2uint(@bitCast(u32, -ex + 1));
     } else {
         ux &= @maxValue(uint) >> exp_bits;
@@ -92,7 +92,7 @@ fn generic_fmod(comptime T: type, x: T, y: T) -> T {
     }
     if (ey == 0) {
         i = uy << exp_bits;
-        while (i >> bits_minus_1 == 0) : ({ey -= 1; i <<= 1}) {}
+        while (i >> bits_minus_1 == 0) : (b: {ey -= 1; break :b i <<= 1;}) {}
         uy <<= log2uint(@bitCast(u32, -ey + 1));
     } else {
         uy &= @maxValue(uint) >> exp_bits;
@@ -115,7 +115,7 @@ fn generic_fmod(comptime T: type, x: T, y: T) -> T {
             return 0 * x;
         ux = i;
     }
-    while (ux >> digits == 0) : ({ux <<= 1; ex -= 1}) {}
+    while (ux >> digits == 0) : (b: {ux <<= 1; break :b ex -= 1;}) {}
 
     // scale result up
     if (ex > 0) {
diff --git a/std/special/compiler_rt/comparetf2.zig b/std/special/compiler_rt/comparetf2.zig
index 083407267..b88c35019 100644
--- a/std/special/compiler_rt/comparetf2.zig
+++ b/std/special/compiler_rt/comparetf2.zig
@@ -38,27 +38,25 @@ pub extern fn __letf2(a: f128, b: f128) -> c_int {
 
     // If at least one of a and b is positive, we get the same result comparing
     // a and b as signed integers as we would with a floating-point compare.
-    return if ((aInt & bInt) >= 0) {
-        if (aInt < bInt) {
+    return if ((aInt & bInt) >= 0)
+        if (aInt < bInt)
             LE_LESS
-        } else if (aInt == bInt) {
+        else if (aInt == bInt)
             LE_EQUAL
-        } else {
+        else
             LE_GREATER
-        }
-    } else {
+    else
         // Otherwise, both are negative, so we need to flip the sense of the
         // comparison to get the correct result.  (This assumes a twos- or ones-
         // complement integer representation; if integers are represented in a
         // sign-magnitude representation, then this flip is incorrect).
-        if (aInt > bInt) {
+        if (aInt > bInt)
             LE_LESS
-        } else if (aInt == bInt) {
+        else if (aInt == bInt)
             LE_EQUAL
-        } else {
+        else
             LE_GREATER
-        }
-    };
+    ;
 }
 
 // TODO https://github.com/zig-lang/zig/issues/305
@@ -78,23 +76,21 @@ pub extern fn __getf2(a: f128, b: f128) -> c_int {
 
     if (aAbs > infRep or bAbs > infRep) return GE_UNORDERED;
     if ((aAbs | bAbs) == 0) return GE_EQUAL;
-    return if ((aInt & bInt) >= 0) {
-        if (aInt < bInt) {
+    return if ((aInt & bInt) >= 0)
+        if (aInt < bInt)
             GE_LESS
-        } else if (aInt == bInt) {
+        else if (aInt == bInt)
             GE_EQUAL
-        } else {
+        else
             GE_GREATER
-        }
-    } else {
-        if (aInt > bInt) {
+    else
+        if (aInt > bInt)
             GE_LESS
-        } else if (aInt == bInt) {
+        else if (aInt == bInt)
             GE_EQUAL
-        } else {
+        else
             GE_GREATER
-        }
-    };
+    ;
 }
 
 pub extern fn __unordtf2(a: f128, b: f128) -> c_int {
diff --git a/test/cases/align.zig b/test/cases/align.zig
index 3bf0d9c9a..3105945e0 100644
--- a/test/cases/align.zig
+++ b/test/cases/align.zig
@@ -10,7 +10,7 @@ test "global variable alignment" {
     assert(@typeOf(slice) == []align(4) u8);
 }
 
-fn derp() align(@sizeOf(usize) * 2) -> i32 { 1234 }
+fn derp() align(@sizeOf(usize) * 2) -> i32 { return 1234; }
 fn noop1() align(1) {}
 fn noop4() align(4) {}
 
@@ -53,14 +53,14 @@ test "implicitly decreasing pointer alignment" {
     assert(addUnaligned(&a, &b) == 7);
 }
 
-fn addUnaligned(a: &align(1) const u32, b: &align(1) const u32) -> u32 { *a + *b }
+fn addUnaligned(a: &align(1) const u32, b: &align(1) const u32) -> u32 { return *a + *b; }
 
 test "implicitly decreasing slice alignment" {
     const a: u32 align(4) = 3;
     const b: u32 align(8) = 4;
     assert(addUnalignedSlice((&a)[0..1], (&b)[0..1]) == 7);
 }
-fn addUnalignedSlice(a: []align(1) const u32, b: []align(1) const u32) -> u32 { a[0] + b[0] }
+fn addUnalignedSlice(a: []align(1) const u32, b: []align(1) const u32) -> u32 { return a[0] + b[0]; }
 
 test "specifying alignment allows pointer cast" {
     testBytesAlign(0x33);
@@ -115,20 +115,20 @@ fn testImplicitlyDecreaseFnAlign(ptr: fn () align(1) -> i32, answer: i32) {
     assert(ptr() == answer);
 }
 
-fn alignedSmall() align(8) -> i32 { 1234 }
-fn alignedBig() align(16) -> i32 { 5678 }
+fn alignedSmall() align(8) -> i32 { return 1234; }
+fn alignedBig() align(16) -> i32 { return 5678; }
 
 
 test "@alignCast functions" {
     assert(fnExpectsOnly1(simple4) == 0x19);
 }
 fn fnExpectsOnly1(ptr: fn()align(1) -> i32) -> i32 {
-    fnExpects4(@alignCast(4, ptr))
+    return fnExpects4(@alignCast(4, ptr));
 }
 fn fnExpects4(ptr: fn()align(4) -> i32) -> i32 {
-    ptr()
+    return ptr();
 }
-fn simple4() align(4) -> i32 { 0x19 }
+fn simple4() align(4) -> i32 { return 0x19; }
 
 
 test "generic function with align param" {
@@ -137,7 +137,7 @@ test "generic function with align param" {
     assert(whyWouldYouEverDoThis(8) == 0x1);
 }
 
-fn whyWouldYouEverDoThis(comptime align_bytes: u8) align(align_bytes) -> u8 { 0x1 }
+fn whyWouldYouEverDoThis(comptime align_bytes: u8) align(align_bytes) -> u8 { return 0x1; }
 
 
 test "@ptrCast preserves alignment of bigger source" {
diff --git a/test/cases/array.zig b/test/cases/array.zig
index a6fa07b00..bf77e51fe 100644
--- a/test/cases/array.zig
+++ b/test/cases/array.zig
@@ -22,7 +22,7 @@ test "arrays" {
     assert(getArrayLen(array) == 5);
 }
 fn getArrayLen(a: []const u32) -> usize {
-    a.len
+    return a.len;
 }
 
 test "void arrays" {
@@ -41,7 +41,7 @@ test "array literal" {
 }
 
 test "array dot len const expr" {
-    assert(comptime {some_array.len == 4});
+    assert(comptime x: {break :x some_array.len == 4;});
 }
 
 const ArrayDotLenConstExpr = struct {
diff --git a/test/cases/bitcast.zig b/test/cases/bitcast.zig
index 72ca24cf5..0a92d9d60 100644
--- a/test/cases/bitcast.zig
+++ b/test/cases/bitcast.zig
@@ -10,5 +10,5 @@ fn testBitCast_i32_u32() {
     assert(conv2(@maxValue(u32)) == -1);
 }
 
-fn conv(x: i32) -> u32 { @bitCast(u32, x) }
-fn conv2(x: u32) -> i32 { @bitCast(i32, x) }
+fn conv(x: i32) -> u32 { return @bitCast(u32, x); }
+fn conv2(x: u32) -> i32 { return @bitCast(i32, x); }
diff --git a/test/cases/bool.zig b/test/cases/bool.zig
index 61bb3bf75..1203e696b 100644
--- a/test/cases/bool.zig
+++ b/test/cases/bool.zig
@@ -22,7 +22,7 @@ test "bool cmp" {
     assert(testBoolCmp(true, false) == false);
 }
 fn testBoolCmp(a: bool, b: bool) -> bool {
-    a == b
+    return a == b;
 }
 
 const global_f = false;
diff --git a/test/cases/cast.zig b/test/cases/cast.zig
index c93d2e741..8b16cb44d 100644
--- a/test/cases/cast.zig
+++ b/test/cases/cast.zig
@@ -50,7 +50,7 @@ test "peer resolve arrays of different size to const slice" {
     comptime assert(mem.eql(u8, boolToStr(false), "false"));
 }
 fn boolToStr(b: bool) -> []const u8 {
-    if (b) "true" else "false"
+    return if (b) "true" else "false";
 }
 
 
@@ -239,17 +239,17 @@ test "peer type resolution: error and [N]T" {
 
 error BadValue;
 fn testPeerErrorAndArray(x: u8) -> %[]const u8 {
-    switch (x) {
+    return switch (x) {
         0x00 => "OK",
         else => error.BadValue,
-    }
+    };
 }
 fn testPeerErrorAndArray2(x: u8) -> %[]const u8 {
-    switch (x) {
+    return switch (x) {
         0x00 => "OK",
         0x01 => "OKK",
         else => error.BadValue,
-    }
+    };
 }
 
 test "explicit cast float number literal to integer if no fraction component" {
@@ -269,11 +269,11 @@ fn testCast128() {
 }
 
 fn cast128Int(x: f128) -> u128 {
-    @bitCast(u128, x)
+    return @bitCast(u128, x);
 }
 
 fn cast128Float(x: u128) -> f128 {
-    @bitCast(f128, x)
+    return @bitCast(f128, x);
 }
 
 test "const slice widen cast" {
diff --git a/test/cases/defer.zig b/test/cases/defer.zig
index 6cafe9f33..d4cb79ec4 100644
--- a/test/cases/defer.zig
+++ b/test/cases/defer.zig
@@ -7,9 +7,9 @@ error FalseNotAllowed;
 
 fn runSomeErrorDefers(x: bool) -> %bool {
     index = 0;
-    defer {result[index] = 'a'; index += 1;};
-    %defer {result[index] = 'b'; index += 1;};
-    defer {result[index] = 'c'; index += 1;};
+    defer {result[index] = 'a'; index += 1;}
+    %defer {result[index] = 'b'; index += 1;}
+    defer {result[index] = 'c'; index += 1;}
     return if (x) x else error.FalseNotAllowed;
 }
 
@@ -18,9 +18,9 @@ test "mixing normal and error defers" {
     assert(result[0] == 'c');
     assert(result[1] == 'a');
 
-    const ok = runSomeErrorDefers(false) %% |err| {
+    const ok = runSomeErrorDefers(false) %% |err| x: {
         assert(err == error.FalseNotAllowed);
-        true
+        break :x true;
     };
     assert(ok);
     assert(result[0] == 'c');
@@ -41,5 +41,5 @@ fn testBreakContInDefer(x: usize) {
             if (i == 5) break;
         }
         assert(i == 5);
-    };
+    }
 }
diff --git a/test/cases/enum.zig b/test/cases/enum.zig
index 6352a23af..26aa8fb58 100644
--- a/test/cases/enum.zig
+++ b/test/cases/enum.zig
@@ -41,7 +41,7 @@ const Bar = enum {
 };
 
 fn returnAnInt(x: i32) -> Foo {
-    Foo { .One = x }
+    return Foo { .One = x };
 }
 
 
diff --git a/test/cases/enum_with_members.zig b/test/cases/enum_with_members.zig
index ae48a266d..c28692575 100644
--- a/test/cases/enum_with_members.zig
+++ b/test/cases/enum_with_members.zig
@@ -8,9 +8,9 @@ const ET = union(enum) {
 
     pub fn print(a: &const ET, buf: []u8) -> %usize {
         return switch (*a) {
-            ET.SINT => |x| { fmt.formatIntBuf(buf, x, 10, false, 0) },
-            ET.UINT => |x| { fmt.formatIntBuf(buf, x, 10, false, 0) },
-        }
+            ET.SINT => |x| fmt.formatIntBuf(buf, x, 10, false, 0),
+            ET.UINT => |x| fmt.formatIntBuf(buf, x, 10, false, 0),
+        };
     }
 };
 
diff --git a/test/cases/error.zig b/test/cases/error.zig
index 9e55f57b6..3974e9dc7 100644
--- a/test/cases/error.zig
+++ b/test/cases/error.zig
@@ -3,7 +3,7 @@ const mem = @import("std").mem;
 
 pub fn foo() -> %i32 {
     const x = %return bar();
-    return x + 1
+    return x + 1;
 }
 
 pub fn bar() -> %i32 {
@@ -21,7 +21,7 @@ test "error wrapping" {
 
 error ItBroke;
 fn gimmeItBroke() -> []const u8 {
-    @errorName(error.ItBroke)
+    return @errorName(error.ItBroke);
 }
 
 test "@errorName" {
@@ -48,7 +48,7 @@ error AnError;
 error AnError;
 error SecondError;
 fn shouldBeNotEqual(a: error, b: error) {
-    if (a == b) unreachable
+    if (a == b) unreachable;
 }
 
 
@@ -60,11 +60,7 @@ test "error binary operator" {
 }
 error ItBroke;
 fn errBinaryOperatorG(x: bool) -> %isize {
-    if (x) {
-        error.ItBroke
-    } else {
-        isize(10)
-    }
+    return if (x) error.ItBroke else isize(10);
 }
 
 
@@ -72,7 +68,7 @@ test "unwrap simple value from error" {
     const i = %%unwrapSimpleValueFromErrorDo();
     assert(i == 13);
 }
-fn unwrapSimpleValueFromErrorDo() -> %isize { 13 }
+fn unwrapSimpleValueFromErrorDo() -> %isize { return 13; }
 
 
 test "error return in assignment" {
diff --git a/test/cases/eval.zig b/test/cases/eval.zig
index c657482d0..a2e015fba 100644
--- a/test/cases/eval.zig
+++ b/test/cases/eval.zig
@@ -44,7 +44,7 @@ test "static function evaluation" {
     assert(statically_added_number == 3);
 }
 const statically_added_number = staticAdd(1, 2);
-fn staticAdd(a: i32, b: i32) -> i32 { a + b }
+fn staticAdd(a: i32, b: i32) -> i32 { return a + b; }
 
 
 test "const expr eval on single expr blocks" {
@@ -54,10 +54,10 @@ test "const expr eval on single expr blocks" {
 fn constExprEvalOnSingleExprBlocksFn(x: i32, b: bool) -> i32 {
     const literal = 3;
 
-    const result = if (b) {
-        literal
-    } else {
-        x
+    const result = if (b) b: {
+        break :b literal;
+    } else b: {
+        break :b x;
     };
 
     return result;
@@ -94,9 +94,9 @@ pub const Vec3 = struct {
     data: [3]f32,
 };
 pub fn vec3(x: f32, y: f32, z: f32) -> Vec3 {
-    Vec3 {
+    return Vec3 {
         .data = []f32 { x, y, z, },
-    }
+    };
 }
 
 
@@ -176,7 +176,7 @@ fn max(comptime T: type, a: T, b: T) -> T {
     }
 }
 fn letsTryToCompareBools(a: bool, b: bool) -> bool {
-    max(bool, a, b)
+    return max(bool, a, b);
 }
 test "inlined block and runtime block phi" {
     assert(letsTryToCompareBools(true, true));
@@ -202,9 +202,9 @@ const cmd_fns = []CmdFn{
     CmdFn {.name = "two", .func = two},
     CmdFn {.name = "three", .func = three},
 };
-fn one(value: i32) -> i32 { value + 1 }
-fn two(value: i32) -> i32 { value + 2 }
-fn three(value: i32) -> i32 { value + 3 }
+fn one(value: i32) -> i32 { return value + 1; }
+fn two(value: i32) -> i32 { return value + 2; }
+fn three(value: i32) -> i32 { return value + 3; }
 
 fn performFn(comptime prefix_char: u8, start_value: i32) -> i32 {
     var result: i32 = start_value;
@@ -317,12 +317,12 @@ test "create global array with for loop" {
     assert(global_array[9] == 9 * 9);
 }
 
-const global_array = {
+const global_array = x: {
     var result: [10]usize = undefined;
     for (result) |*item, index| {
         *item = index * index;
     }
-    result
+    break :x result;
 };
 
 test "compile-time downcast when the bits fit" {
diff --git a/test/cases/fn.zig b/test/cases/fn.zig
index c948d8af3..aad68447b 100644
--- a/test/cases/fn.zig
+++ b/test/cases/fn.zig
@@ -4,7 +4,7 @@ test "params" {
     assert(testParamsAdd(22, 11) == 33);
 }
 fn testParamsAdd(a: i32, b: i32) -> i32 {
-    a + b
+    return a + b;
 }
 
 
@@ -22,7 +22,7 @@ test "void parameters" {
 }
 fn voidFun(a: i32, b: void, c: i32, d: void) {
     const v = b;
-    const vv: void = if (a == 1) {v} else {};
+    const vv: void = if (a == 1) v else {};
     assert(a + c == 3);
     return vv;
 }
@@ -45,9 +45,9 @@ test "separate block scopes" {
         assert(no_conflict == 5);
     }
 
-    const c = {
+    const c = x: {
         const no_conflict = i32(10);
-        no_conflict
+        break :x no_conflict;
     };
     assert(c == 10);
 }
@@ -73,7 +73,7 @@ test "implicit cast function unreachable return" {
 fn wantsFnWithVoid(f: fn()) { }
 
 fn fnWithUnreachable() -> noreturn {
-    unreachable
+    unreachable;
 }
 
 
@@ -83,14 +83,14 @@ test "function pointers" {
         assert(f() == u32(i) + 5);
     }
 }
-fn fn1() -> u32 {5}
-fn fn2() -> u32 {6}
-fn fn3() -> u32 {7}
-fn fn4() -> u32 {8}
+fn fn1() -> u32 {return 5;}
+fn fn2() -> u32 {return 6;}
+fn fn3() -> u32 {return 7;}
+fn fn4() -> u32 {return 8;}
 
 
 test "inline function call" {
     assert(@inlineCall(add, 3, 9) == 12);
 }
 
-fn add(a: i32, b: i32) -> i32 { a + b }
+fn add(a: i32, b: i32) -> i32 { return a + b; }
diff --git a/test/cases/for.zig b/test/cases/for.zig
index e4b8094cf..5a7919541 100644
--- a/test/cases/for.zig
+++ b/test/cases/for.zig
@@ -12,7 +12,7 @@ test "continue in for loop" {
         }
         break;
     }
-    if (sum != 6) unreachable
+    if (sum != 6) unreachable;
 }
 
 test "for loop with pointer elem var" {
diff --git a/test/cases/generics.zig b/test/cases/generics.zig
index d6a3192a6..96500e39b 100644
--- a/test/cases/generics.zig
+++ b/test/cases/generics.zig
@@ -11,7 +11,7 @@ fn max(comptime T: type, a: T, b: T) -> T {
 }
 
 fn add(comptime a: i32, b: i32) -> i32 {
-    return (comptime {a}) + b;
+    return (comptime a) + b;
 }
 
 const the_max = max(u32, 1234, 5678);
@@ -20,15 +20,15 @@ test "compile time generic eval" {
 }
 
 fn gimmeTheBigOne(a: u32, b: u32) -> u32 {
-    max(u32, a, b)
+    return max(u32, a, b);
 }
 
 fn shouldCallSameInstance(a: u32, b: u32) -> u32 {
-    max(u32, a, b)
+    return max(u32, a, b);
 }
 
 fn sameButWithFloats(a: f64, b: f64) -> f64 {
-    max(f64, a, b)
+    return max(f64, a, b);
 }
 
 test "fn with comptime args" {
@@ -49,28 +49,28 @@ comptime {
 }
 
 fn max_var(a: var, b: var) -> @typeOf(a + b) {
-    if (a > b) a else b
+    return if (a > b) a else b;
 }
 
 fn max_i32(a: i32, b: i32) -> i32 {
-    max_var(a, b)
+    return max_var(a, b);
 }
 
 fn max_f64(a: f64, b: f64) -> f64 {
-    max_var(a, b)
+    return max_var(a, b);
 }
 
 
 pub fn List(comptime T: type) -> type {
-    SmallList(T, 8)
+    return SmallList(T, 8);
 }
 
 pub fn SmallList(comptime T: type, comptime STATIC_SIZE: usize) -> type {
-    struct {
+    return struct {
         items: []T,
         length: usize,
         prealloc_items: [STATIC_SIZE]T,
-    }
+    };
 }
 
 test "function with return type type" {
@@ -91,20 +91,20 @@ test "generic struct" {
     assert(b1.getVal());
 }
 fn GenNode(comptime T: type) -> type {
-    struct {
+    return struct {
         value: T,
         next: ?&GenNode(T),
-        fn getVal(n: &const GenNode(T)) -> T { n.value }
-    }
+        fn getVal(n: &const GenNode(T)) -> T { return n.value; }
+    };
 }
 
 test "const decls in struct" {
     assert(GenericDataThing(3).count_plus_one == 4);
 }
 fn GenericDataThing(comptime count: isize) -> type {
-    struct {
+    return struct {
         const count_plus_one = count + 1;
-    }
+    };
 }
 
 
@@ -120,16 +120,16 @@ test "generic fn with implicit cast" {
     assert(getFirstByte(u8, []u8 {13}) == 13);
     assert(getFirstByte(u16, []u16 {0, 13}) == 0);
 }
-fn getByte(ptr: ?&const u8) -> u8 {*??ptr}
+fn getByte(ptr: ?&const u8) -> u8 {return *??ptr;}
 fn getFirstByte(comptime T: type, mem: []const T) -> u8 {
-    getByte(@ptrCast(&const u8, &mem[0]))
+    return getByte(@ptrCast(&const u8, &mem[0]));
 }
 
 
 const foos = []fn(var) -> bool { foo1, foo2 };
 
-fn foo1(arg: var) -> bool { arg }
-fn foo2(arg: var) -> bool { !arg }
+fn foo1(arg: var) -> bool { return arg; }
+fn foo2(arg: var) -> bool { return !arg; }
 
 test "array of generic fns" {
     assert(foos[0](true));
diff --git a/test/cases/if.zig b/test/cases/if.zig
index 10fedcdea..d1fa717b5 100644
--- a/test/cases/if.zig
+++ b/test/cases/if.zig
@@ -29,10 +29,10 @@ test "else if expression" {
 }
 fn elseIfExpressionF(c: u8) -> u8 {
     if (c == 0) {
-        0
+        return 0;
     } else if (c == 1) {
-        1
+        return 1;
     } else {
-        u8(2)
+        return u8(2);
     }
 }
diff --git a/test/cases/import/a_namespace.zig b/test/cases/import/a_namespace.zig
index d6926fbb5..40cdd6913 100644
--- a/test/cases/import/a_namespace.zig
+++ b/test/cases/import/a_namespace.zig
@@ -1 +1 @@
-pub fn foo() -> i32 { 1234 }
+pub fn foo() -> i32 { return 1234; }
diff --git a/test/cases/ir_block_deps.zig b/test/cases/ir_block_deps.zig
index e6ce12bd6..a70dff0c8 100644
--- a/test/cases/ir_block_deps.zig
+++ b/test/cases/ir_block_deps.zig
@@ -8,10 +8,10 @@ fn foo(id: u64) -> %i32 {
             return %return getErrInt();
         },
         else => error.ItBroke,
-    }
+    };
 }
 
-fn getErrInt() -> %i32 { 0 }
+fn getErrInt() -> %i32 { return 0; }
 
 error ItBroke;
 
diff --git a/test/cases/math.zig b/test/cases/math.zig
index 1d29800aa..b4e0e4cfd 100644
--- a/test/cases/math.zig
+++ b/test/cases/math.zig
@@ -28,16 +28,16 @@ fn testDivision() {
     assert(divTrunc(f32, -5.0, 3.0) == -1.0);
 }
 fn div(comptime T: type, a: T, b: T) -> T {
-    a / b
+    return a / b;
 }
 fn divExact(comptime T: type, a: T, b: T) -> T {
-    @divExact(a, b)
+    return @divExact(a, b);
 }
 fn divFloor(comptime T: type, a: T, b: T) -> T {
-    @divFloor(a, b)
+    return @divFloor(a, b);
 }
 fn divTrunc(comptime T: type, a: T, b: T) -> T {
-    @divTrunc(a, b)
+    return @divTrunc(a, b);
 }
 
 test "@addWithOverflow" {
@@ -71,7 +71,7 @@ fn testClz() {
 }
 
 fn clz(x: var) -> usize {
-    @clz(x)
+    return @clz(x);
 }
 
 test "@ctz" {
@@ -86,7 +86,7 @@ fn testCtz() {
 }
 
 fn ctz(x: var) -> usize {
-    @ctz(x)
+    return @ctz(x);
 }
 
 test "assignment operators" {
@@ -180,10 +180,10 @@ fn test_u64_div() {
     assert(result.remainder == 100663296);
 }
 fn divWithResult(a: u64, b: u64) -> DivResult {
-    DivResult {
+    return DivResult {
         .quotient = a / b,
         .remainder = a % b,
-    }
+    };
 }
 const DivResult = struct {
     quotient: u64,
@@ -191,8 +191,8 @@ const DivResult = struct {
 };
 
 test "binary not" {
-    assert(comptime {~u16(0b1010101010101010) == 0b0101010101010101});
-    assert(comptime {~u64(2147483647) == 18446744071562067968});
+    assert(comptime x: {break :x ~u16(0b1010101010101010) == 0b0101010101010101;});
+    assert(comptime x: {break :x ~u64(2147483647) == 18446744071562067968;});
     testBinaryNot(0b1010101010101010);
 }
 
@@ -331,7 +331,7 @@ test "f128" {
     comptime test_f128();
 }
 
-fn make_f128(x: f128) -> f128 { x }
+fn make_f128(x: f128) -> f128 { return x; }
 
 fn test_f128() {
     assert(@sizeOf(f128) == 16);
diff --git a/test/cases/misc.zig b/test/cases/misc.zig
index daa7c3eb9..e456ca529 100644
--- a/test/cases/misc.zig
+++ b/test/cases/misc.zig
@@ -110,17 +110,17 @@ fn testShortCircuit(f: bool, t: bool) {
     var hit_3 = f;
     var hit_4 = f;
 
-    if (t or {assert(f); f}) {
+    if (t or x: {assert(f); break :x f;}) {
         hit_1 = t;
     }
-    if (f or { hit_2 = t; f }) {
+    if (f or x: { hit_2 = t; break :x f; }) {
         assert(f);
     }
 
-    if (t and { hit_3 = t; f }) {
+    if (t and x: { hit_3 = t; break :x f; }) {
         assert(f);
     }
-    if (f and {assert(f); f}) {
+    if (f and x: {assert(f); break :x f;}) {
         assert(f);
     } else {
         hit_4 = t;
@@ -135,11 +135,11 @@ test "truncate" {
     assert(testTruncate(0x10fd) == 0xfd);
 }
 fn testTruncate(x: u32) -> u8 {
-    @truncate(u8, x)
+    return @truncate(u8, x);
 }
 
 fn first4KeysOfHomeRow() -> []const u8 {
-    "aoeu"
+    return "aoeu";
 }
 
 test "return string from function" {
@@ -167,7 +167,7 @@ test "memcpy and memset intrinsics" {
 }
 
 test "builtin static eval" {
-    const x : i32 = comptime {1 + 2 + 3};
+    const x : i32 = comptime x: {break :x 1 + 2 + 3;};
     assert(x == comptime 6);
 }
 
@@ -190,7 +190,7 @@ test "slicing" {
 
 test "constant equal function pointers" {
     const alias = emptyFn;
-    assert(comptime {emptyFn == alias});
+    assert(comptime x: {break :x emptyFn == alias;});
 }
 
 fn emptyFn() {}
@@ -280,14 +280,14 @@ test "cast small unsigned to larger signed" {
     assert(castSmallUnsignedToLargerSigned1(200) == i16(200));
     assert(castSmallUnsignedToLargerSigned2(9999) == i64(9999));
 }
-fn castSmallUnsignedToLargerSigned1(x: u8) -> i16 { x }
-fn castSmallUnsignedToLargerSigned2(x: u16) -> i64 { x }
+fn castSmallUnsignedToLargerSigned1(x: u8) -> i16 { return x; }
+fn castSmallUnsignedToLargerSigned2(x: u16) -> i64 { return x; }
 
 
 test "implicit cast after unreachable" {
     assert(outer() == 1234);
 }
-fn inner() -> i32 { 1234 }
+fn inner() -> i32 { return 1234; }
 fn outer() -> i64 {
     return inner();
 }
@@ -310,8 +310,8 @@ test "call result of if else expression" {
 fn f2(x: bool) -> []const u8 {
     return (if (x) fA else fB)();
 }
-fn fA() -> []const u8 { "a" }
-fn fB() -> []const u8 { "b" }
+fn fA() -> []const u8 { return "a"; }
+fn fB() -> []const u8 { return "b"; }
 
 
 test "const expression eval handling of variables" {
@@ -379,7 +379,7 @@ test "pointer comparison" {
     assert(ptrEql(b, b));
 }
 fn ptrEql(a: &const []const u8, b: &const []const u8) -> bool {
-    a == b
+    return a == b;
 }
 
 
@@ -483,7 +483,7 @@ test "@typeId" {
         assert(@typeId(AUnion) == Tid.Union);
         assert(@typeId(fn()) == Tid.Fn);
         assert(@typeId(@typeOf(builtin)) == Tid.Namespace);
-        assert(@typeId(@typeOf({this})) == Tid.Block);
+        assert(@typeId(@typeOf(x: {break :x this;})) == Tid.Block);
         // TODO bound fn
         // TODO arg tuple
         // TODO opaque
diff --git a/test/cases/reflection.zig b/test/cases/reflection.zig
index cbd98d212..9b298f882 100644
--- a/test/cases/reflection.zig
+++ b/test/cases/reflection.zig
@@ -22,7 +22,7 @@ test "reflection: function return type, var args, and param types" {
     }
 }
 
-fn dummy(a: bool, b: i32, c: f32) -> i32 { 1234 }
+fn dummy(a: bool, b: i32, c: f32) -> i32 { return 1234; }
 fn dummy_varargs(args: ...) {}
 
 test "reflection: struct member types and names" {
diff --git a/test/cases/struct.zig b/test/cases/struct.zig
index 1a9a03c71..28792e9a7 100644
--- a/test/cases/struct.zig
+++ b/test/cases/struct.zig
@@ -2,7 +2,7 @@ const assert = @import("std").debug.assert;
 const builtin = @import("builtin");
 
 const StructWithNoFields = struct {
-    fn add(a: i32, b: i32) -> i32 { a + b }
+    fn add(a: i32, b: i32) -> i32 { return a + b; }
 };
 const empty_global_instance = StructWithNoFields {};
 
@@ -109,7 +109,7 @@ const Foo = struct {
     ptr: fn() -> i32,
 };
 
-fn aFunc() -> i32 { 13 }
+fn aFunc() -> i32 { return 13; }
 
 fn callStructField(foo: &const Foo) -> i32 {
     return foo.ptr();
@@ -124,7 +124,7 @@ test "store member function in variable" {
 }
 const MemberFnTestFoo = struct {
     x: i32,
-    fn member(foo: &const MemberFnTestFoo) -> i32 { foo.x }
+    fn member(foo: &const MemberFnTestFoo) -> i32 { return foo.x; }
 };
 
 
@@ -141,7 +141,7 @@ test "member functions" {
 const MemberFnRand = struct {
     seed: u32,
     pub fn getSeed(r: &const MemberFnRand) -> u32 {
-        r.seed
+        return r.seed;
     }
 };
 
@@ -154,10 +154,10 @@ const Bar = struct {
     y: i32,
 };
 fn makeBar(x: i32, y: i32) -> Bar {
-    Bar {
+    return Bar {
         .x = x,
         .y = y,
-    }
+    };
 }
 
 test "empty struct method call" {
@@ -166,7 +166,7 @@ test "empty struct method call" {
 }
 const EmptyStruct = struct {
     fn method(es: &const EmptyStruct) -> i32 {
-        1234
+        return 1234;
     }
 };
 
@@ -176,14 +176,14 @@ test "return empty struct from fn" {
 }
 const EmptyStruct2 = struct {};
 fn testReturnEmptyStructFromFn() -> EmptyStruct2 {
-    EmptyStruct2 {}
+    return EmptyStruct2 {};
 }
 
 test "pass slice of empty struct to fn" {
     assert(testPassSliceOfEmptyStructToFn([]EmptyStruct2{ EmptyStruct2{} }) == 1);
 }
 fn testPassSliceOfEmptyStructToFn(slice: []const EmptyStruct2) -> usize {
-    slice.len
+    return slice.len;
 }
 
 const APackedStruct = packed struct {
diff --git a/test/cases/switch.zig b/test/cases/switch.zig
index 11c217842..878c0af9e 100644
--- a/test/cases/switch.zig
+++ b/test/cases/switch.zig
@@ -21,12 +21,12 @@ test "switch with all ranges" {
 }
 
 fn testSwitchWithAllRanges(x: u32, y: u32) -> u32 {
-    switch (x) {
+    return switch (x) {
         0 ... 100 => 1,
         101 ... 200 => 2,
         201 ... 300 => 3,
         else => y,
-    }
+    };
 }
 
 test "implicit comptime switch" {
@@ -132,7 +132,7 @@ test "switch with multiple expressions" {
     assert(x == 2);
 }
 fn returnsFive() -> i32 {
-    5
+    return 5;
 }
 
 
@@ -161,10 +161,10 @@ test "switch on type" {
 }
 
 fn trueIfBoolFalseOtherwise(comptime T: type) -> bool {
-    switch (T) {
+    return switch (T) {
         bool => true,
         else => false,
-    }
+    };
 }
 
 test "switch handles all cases of number" {
@@ -186,22 +186,22 @@ fn testSwitchHandleAllCases() {
 }
 
 fn testSwitchHandleAllCasesExhaustive(x: u2) -> u2 {
-    switch (x) {
+    return switch (x) {
         0 => u2(3),
         1 => 2,
         2 => 1,
         3 => 0,
-    }
+    };
 }
 
 fn testSwitchHandleAllCasesRange(x: u8) -> u8 {
-    switch (x) {
+    return switch (x) {
         0 ... 100 => u8(0),
         101 ... 200 => 1,
         201, 203 => 2,
         202 => 4,
         204 ... 255 => 3,
-    }
+    };
 }
 
 test "switch all prongs unreachable" {
diff --git a/test/cases/switch_prong_err_enum.zig b/test/cases/switch_prong_err_enum.zig
index 21f6b0403..be15193c7 100644
--- a/test/cases/switch_prong_err_enum.zig
+++ b/test/cases/switch_prong_err_enum.zig
@@ -18,7 +18,7 @@ fn doThing(form_id: u64) -> %FormValue {
     return switch (form_id) {
         17 => FormValue { .Address = %return readOnce() },
         else => error.InvalidDebugInfo,
-    }
+    };
 }
 
 test "switch prong returns error enum" {
diff --git a/test/cases/switch_prong_implicit_cast.zig b/test/cases/switch_prong_implicit_cast.zig
index e7fe53b84..9e7c09149 100644
--- a/test/cases/switch_prong_implicit_cast.zig
+++ b/test/cases/switch_prong_implicit_cast.zig
@@ -8,11 +8,11 @@ const FormValue = union(enum) {
 error Whatever;
 
 fn foo(id: u64) -> %FormValue {
-    switch (id) {
+    return switch (id) {
         2 => FormValue { .Two = true },
         1 => FormValue { .One = {} },
         else => return error.Whatever,
-    }
+    };
 }
 
 test "switch prong implicit cast" {
diff --git a/test/cases/this.zig b/test/cases/this.zig
index b64c52a09..b4e6b32a0 100644
--- a/test/cases/this.zig
+++ b/test/cases/this.zig
@@ -3,7 +3,7 @@ const assert = @import("std").debug.assert;
 const module = this;
 
 fn Point(comptime T: type) -> type {
-    struct {
+    return struct {
         const Self = this;
         x: T,
         y: T,
@@ -12,20 +12,16 @@ fn Point(comptime T: type) -> type {
             self.x += 1;
             self.y += 1;
         }
-    }
+    };
 }
 
 fn add(x: i32, y: i32) -> i32 {
-    x + y
+    return x + y;
 }
 
 fn factorial(x: i32) -> i32 {
     const selfFn = this;
-    if (x == 0) {
-        1
-    } else {
-        x * selfFn(x - 1)
-    }
+    return if (x == 0) 1 else x * selfFn(x - 1);
 }
 
 test "this refer to module call private fn" {
diff --git a/test/cases/try.zig b/test/cases/try.zig
index 250544371..25b2f321f 100644
--- a/test/cases/try.zig
+++ b/test/cases/try.zig
@@ -7,9 +7,9 @@ test "try on error union" {
 }
 
 fn tryOnErrorUnionImpl() {
-    const x = if (returnsTen()) |val| {
+    const x = if (returnsTen()) |val|
         val + 1
-    } else |err| switch (err) {
+    else |err| switch (err) {
         error.ItBroke, error.NoMem => 1,
         error.CrappedOut => i32(2),
         else => unreachable,
@@ -21,22 +21,14 @@ error ItBroke;
 error NoMem;
 error CrappedOut;
 fn returnsTen() -> %i32 {
-    10
+    return 10;
 }
 
 test "try without vars" {
-    const result1 = if (failIfTrue(true)) {
-        1
-    } else |_| {
-        i32(2)
-    };
+    const result1 = if (failIfTrue(true)) 1 else |_| i32(2);
     assert(result1 == 2);
 
-    const result2 = if (failIfTrue(false)) {
-        1
-    } else |_| {
-        i32(2)
-    };
+    const result2 = if (failIfTrue(false)) 1 else |_| i32(2);
     assert(result2 == 1);
 }
 
diff --git a/test/cases/var_args.zig b/test/cases/var_args.zig
index 363816bc8..7d1610636 100644
--- a/test/cases/var_args.zig
+++ b/test/cases/var_args.zig
@@ -58,8 +58,8 @@ fn extraFn(extra: u32, args: ...) -> usize {
 
 const foos = []fn(...) -> bool { foo1, foo2 };
 
-fn foo1(args: ...) -> bool { true }
-fn foo2(args: ...) -> bool { false }
+fn foo1(args: ...) -> bool { return true; }
+fn foo2(args: ...) -> bool { return false; }
 
 test "array of var args functions" {
     assert(foos[0]());
diff --git a/test/cases/while.zig b/test/cases/while.zig
index c16171d4a..e61fe1f9d 100644
--- a/test/cases/while.zig
+++ b/test/cases/while.zig
@@ -118,73 +118,61 @@ test "while with error union condition" {
 var numbers_left: i32 = undefined;
 error OutOfNumbers;
 fn getNumberOrErr() -> %i32 {
-    return if (numbers_left == 0) {
+    return if (numbers_left == 0)
         error.OutOfNumbers
-    } else {
+    else x: {
         numbers_left -= 1;
-        numbers_left
+        break :x numbers_left;
     };
 }
 fn getNumberOrNull() -> ?i32 {
-    return if (numbers_left == 0) {
+    return if (numbers_left == 0)
         null
-    } else {
+    else x: {
         numbers_left -= 1;
-        numbers_left
+        break :x numbers_left;
     };
 }
 
 test "while on nullable with else result follow else prong" {
     const result = while (returnNull()) |value| {
         break value;
-    } else {
-        i32(2)
-    };
+    } else i32(2);
     assert(result == 2);
 }
 
 test "while on nullable with else result follow break prong" {
     const result = while (returnMaybe(10)) |value| {
         break value;
-    } else {
-        i32(2)
-    };
+    } else i32(2);
     assert(result == 10);
 }
 
 test "while on error union with else result follow else prong" {
     const result = while (returnError()) |value| {
         break value;
-    } else |err| {
-        i32(2)
-    };
+    } else |err| i32(2);
     assert(result == 2);
 }
 
 test "while on error union with else result follow break prong" {
     const result = while (returnSuccess(10)) |value| {
         break value;
-    } else |err| {
-        i32(2)
-    };
+    } else |err| i32(2);
     assert(result == 10);
 }
 
 test "while on bool with else result follow else prong" {
     const result = while (returnFalse()) {
         break i32(10);
-    } else {
-        i32(2)
-    };
+    } else i32(2);
     assert(result == 2);
 }
 
 test "while on bool with else result follow break prong" {
     const result = while (returnTrue()) {
         break i32(10);
-    } else {
-        i32(2)
-    };
+    } else i32(2);
     assert(result == 10);
 }
 
@@ -215,10 +203,10 @@ fn testContinueOuter() {
     }
 }
 
-fn returnNull() -> ?i32 { null }
-fn returnMaybe(x: i32) -> ?i32 { x }
+fn returnNull() -> ?i32 { return null; }
+fn returnMaybe(x: i32) -> ?i32 { return x; }
 error YouWantedAnError;
-fn returnError() -> %i32 { error.YouWantedAnError }
-fn returnSuccess(x: i32) -> %i32 { x }
-fn returnFalse() -> bool { false }
-fn returnTrue() -> bool { true }
+fn returnError() -> %i32 { return error.YouWantedAnError; }
+fn returnSuccess(x: i32) -> %i32 { return x; }
+fn returnFalse() -> bool { return false; }
+fn returnTrue() -> bool { return true; }
diff --git a/test/compare_output.zig b/test/compare_output.zig
index ad9c91ff2..88e25bf40 100644
--- a/test/compare_output.zig
+++ b/test/compare_output.zig
@@ -10,7 +10,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\}
     , "Hello, world!" ++ os.line_sep);
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("multiple files with private function",
             \\use @import("std").io;
             \\use @import("foo.zig");
@@ -41,10 +41,10 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
             \\}
         );
 
-        tc
+        break :x tc;
     });
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("import segregation",
             \\use @import("foo.zig");
             \\use @import("bar.zig");
@@ -82,10 +82,10 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
             \\}
         );
 
-        tc
+        break :x tc;
     });
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("two files use import each other",
             \\use @import("a.zig");
             \\
@@ -112,7 +112,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
             \\pub const b_text = a_text;
         );
 
-        tc
+        break :x tc;
     });
 
     cases.add("hello world without libc",
@@ -286,11 +286,11 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    const a_int = @ptrCast(&align(1) i32, a ?? unreachable);
         \\    const b_int = @ptrCast(&align(1) i32, b ?? unreachable);
         \\    if (*a_int < *b_int) {
-        \\        -1
+        \\        return -1;
         \\    } else if (*a_int > *b_int) {
-        \\        1
+        \\        return 1;
         \\    } else {
-        \\        c_int(0)
+        \\        return 0;
         \\    }
         \\}
         \\
@@ -342,13 +342,13 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\const Foo = struct {
         \\    field1: Bar,
         \\
-        \\    fn method(a: &const Foo) -> bool { true }
+        \\    fn method(a: &const Foo) -> bool { return true; }
         \\};
         \\
         \\const Bar = struct {
         \\    field2: i32,
         \\
-        \\    fn method(b: &const Bar) -> bool { true }
+        \\    fn method(b: &const Bar) -> bool { return true; }
         \\};
         \\
         \\pub fn main() -> %void {
@@ -429,7 +429,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\fn its_gonna_pass() -> %void { }
     , "before\nafter\ndefer3\ndefer1\n");
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("@embedFile",
             \\const foo_txt = @embedFile("foo.txt");
             \\const io = @import("std").io;
@@ -442,10 +442,10 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
 
         tc.addSourceFile("foo.txt", "1234\nabcd\n");
 
-        tc
+        break :x tc;
     });
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("parsing args",
             \\const std = @import("std");
             \\const io = std.io;
@@ -483,10 +483,10 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
             "last arg",
         });
 
-        tc
+        break :x tc;
     });
 
-    cases.addCase({
+    cases.addCase(x: {
         var tc = cases.create("parsing args new API",
             \\const std = @import("std");
             \\const io = std.io;
@@ -524,6 +524,6 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
             "last arg",
         });
 
-        tc
+        break :x tc;
     });
 }
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index 3446acda0..60e5c3614 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -9,7 +9,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\        }
         \\    }
         \\}
-    , ".tmp_source.zig:4:13: error: labeled loop not found: 'outer'");
+    , ".tmp_source.zig:4:13: error: label not found: 'outer'");
 
     cases.add("labeled continue not found",
         \\export fn entry() {
@@ -39,7 +39,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - block expr",
         \\export fn entry() {
@@ -48,7 +48,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - comptime statement",
         \\export fn entry() {
@@ -57,7 +57,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    comptime ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - comptime expression",
         \\export fn entry() {
@@ -66,7 +66,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = comptime {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - defer",
         \\export fn entry() {
@@ -84,7 +84,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    if(true) ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if expression",
         \\export fn entry() {
@@ -93,7 +93,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = if(true) {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else statement",
         \\export fn entry() {
@@ -102,7 +102,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    if(true) ({}) else ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else expression",
         \\export fn entry() {
@@ -111,7 +111,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = if(true) {} else {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else-if statement",
         \\export fn entry() {
@@ -120,7 +120,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    if(true) ({}) else if(true) ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else-if expression",
         \\export fn entry() {
@@ -129,7 +129,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = if(true) {} else if(true) {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else-if-else statement",
         \\export fn entry() {
@@ -138,7 +138,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    if(true) ({}) else if(true) ({}) else ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - if-else-if-else expression",
         \\export fn entry() {
@@ -147,7 +147,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = if(true) {} else if(true) {} else {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - test statement",
         \\export fn entry() {
@@ -156,7 +156,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    if (foo()) |_| ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - test expression",
         \\export fn entry() {
@@ -165,7 +165,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = if (foo()) |_| {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - while statement",
         \\export fn entry() {
@@ -174,7 +174,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    while(true) ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - while expression",
         \\export fn entry() {
@@ -183,7 +183,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = while(true) {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - while-continue statement",
         \\export fn entry() {
@@ -192,7 +192,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    while(true):({}) ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - while-continue expression",
         \\export fn entry() {
@@ -201,7 +201,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = while(true):({}) {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - for statement",
         \\export fn entry() {
@@ -210,7 +210,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    for(foo()) ({})
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("implicit semicolon - for expression",
         \\export fn entry() {
@@ -219,7 +219,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    _ = for(foo()) {}
         \\    var bad = {};
         \\}
-    , ".tmp_source.zig:5:5: error: invalid token: 'var'");
+    , ".tmp_source.zig:5:5: error: expected token ';', found 'var'");
 
     cases.add("multiple function definitions",
         \\fn a() {}
@@ -276,12 +276,13 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("undeclared identifier",
         \\export fn a() {
+        \\    return
         \\    b +
-        \\    c
+        \\    c;
         \\}
     ,
-            ".tmp_source.zig:2:5: error: use of undeclared identifier 'b'",
-            ".tmp_source.zig:3:5: error: use of undeclared identifier 'c'");
+            ".tmp_source.zig:3:5: error: use of undeclared identifier 'b'",
+            ".tmp_source.zig:4:5: error: use of undeclared identifier 'c'");
 
     cases.add("parameter redeclaration",
         \\fn f(a : i32, a : i32) {
@@ -306,9 +307,9 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
     cases.add("variable has wrong type",
         \\export fn f() -> i32 {
         \\    const a = c"a";
-        \\    a
+        \\    return a;
         \\}
-    , ".tmp_source.zig:3:5: error: expected type 'i32', found '&const u8'");
+    , ".tmp_source.zig:3:12: error: expected type 'i32', found '&const u8'");
 
     cases.add("if condition is bool, not int",
         \\export fn f() {
@@ -393,23 +394,23 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("missing else clause",
         \\fn f(b: bool) {
-        \\    const x : i32 = if (b) { 1 };
-        \\    const y = if (b) { i32(1) };
+        \\    const x : i32 = if (b) h: { break :h 1; };
+        \\    const y = if (b) h: { break :h i32(1); };
         \\}
         \\export fn entry() { f(true); }
-    , ".tmp_source.zig:2:30: error: integer value 1 cannot be implicitly casted to type 'void'",
+    , ".tmp_source.zig:2:42: error: integer value 1 cannot be implicitly casted to type 'void'",
                  ".tmp_source.zig:3:15: error: incompatible types: 'i32' and 'void'");
 
     cases.add("direct struct loop",
         \\const A = struct { a : A, };
-        \\export fn entry() -> usize { @sizeOf(A) }
+        \\export fn entry() -> usize { return @sizeOf(A); }
     , ".tmp_source.zig:1:11: error: struct 'A' contains itself");
 
     cases.add("indirect struct loop",
         \\const A = struct { b : B, };
         \\const B = struct { c : C, };
         \\const C = struct { a : A, };
-        \\export fn entry() -> usize { @sizeOf(A) }
+        \\export fn entry() -> usize { return @sizeOf(A); }
     , ".tmp_source.zig:1:11: error: struct 'A' contains itself");
 
     cases.add("invalid struct field",
@@ -507,10 +508,10 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("cast unreachable",
         \\fn f() -> i32 {
-        \\    i32(return 1)
+        \\    return i32(return 1);
         \\}
         \\export fn entry() { _ = f(); }
-    , ".tmp_source.zig:2:8: error: unreachable code");
+    , ".tmp_source.zig:2:15: error: unreachable code");
 
     cases.add("invalid builtin fn",
         \\fn f() -> @bogus(foo) {
@@ -533,7 +534,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("struct init syntax for array",
         \\const foo = []u16{.x = 1024,};
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:1:18: error: type '[]u16' does not support struct initialization syntax");
 
     cases.add("type variables must be constant",
@@ -576,7 +577,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    }
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:8:5: error: enumeration value 'Number.Four' not handled in switch");
 
     cases.add("switch expression - duplicate enumeration prong",
@@ -596,7 +597,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    }
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:13:15: error: duplicate switch value",
       ".tmp_source.zig:10:15: note: other value is here");
 
@@ -618,7 +619,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    }
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:13:15: error: duplicate switch value",
       ".tmp_source.zig:10:15: note: other value is here");
 
@@ -641,20 +642,20 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\        0 => {},
         \\    }
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     ,
         ".tmp_source.zig:2:5: error: switch must handle all possibilities");
 
     cases.add("switch expression - duplicate or overlapping integer value",
         \\fn foo(x: u8) -> u8 {
-        \\    switch (x) {
+        \\    return switch (x) {
         \\        0 ... 100 => u8(0),
         \\        101 ... 200 => 1,
         \\        201, 203 ... 207 => 2,
         \\        206 ... 255 => 3,
-        \\    }
+        \\    };
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     ,
         ".tmp_source.zig:6:9: error: duplicate switch value",
         ".tmp_source.zig:5:14: note: previous value is here");
@@ -666,14 +667,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    }
         \\}
         \\const y: u8 = 100;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     ,
         ".tmp_source.zig:2:5: error: else prong required when switching on type '&u8'");
 
     cases.add("global variable initializer must be constant expression",
         \\extern fn foo() -> i32;
         \\const x = foo();
-        \\export fn entry() -> i32 { x }
+        \\export fn entry() -> i32 { return x; }
     , ".tmp_source.zig:2:11: error: unable to evaluate constant expression");
 
     cases.add("array concatenation with wrong type",
@@ -681,38 +682,38 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const derp = usize(1234);
         \\const a = derp ++ "foo";
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(a)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(a)); }
     , ".tmp_source.zig:3:11: error: expected array or C string literal, found 'usize'");
 
     cases.add("non compile time array concatenation",
         \\fn f() -> []u8 {
-        \\    s ++ "foo"
+        \\    return s ++ "foo";
         \\}
         \\var s: [10]u8 = undefined;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
-    , ".tmp_source.zig:2:5: error: unable to evaluate constant expression");
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
+    , ".tmp_source.zig:2:12: error: unable to evaluate constant expression");
 
     cases.add("@cImport with bogus include",
         \\const c = @cImport(@cInclude("bogus.h"));
-        \\export fn entry() -> usize { @sizeOf(@typeOf(c.bogo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(c.bogo)); }
     , ".tmp_source.zig:1:11: error: C import failed",
                  ".h:1:10: note: 'bogus.h' file not found");
 
     cases.add("address of number literal",
         \\const x = 3;
         \\const y = &x;
-        \\fn foo() -> &const i32 { y }
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
-    , ".tmp_source.zig:3:26: error: expected type '&const i32', found '&const (integer literal)'");
+        \\fn foo() -> &const i32 { return y; }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
+    , ".tmp_source.zig:3:33: error: expected type '&const i32', found '&const (integer literal)'");
 
     cases.add("integer overflow error",
         \\const x : u8 = 300;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(x)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(x)); }
     , ".tmp_source.zig:1:16: error: integer value 300 cannot be implicitly casted to type 'u8'");
 
     cases.add("incompatible number literals",
         \\const x = 2 == 2.0;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(x)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(x)); }
     , ".tmp_source.zig:1:11: error: integer value 2 cannot be implicitly casted to type '(float literal)'");
 
     cases.add("missing function call param",
@@ -738,32 +739,32 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    const result = members[index]();
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:20:34: error: expected 1 arguments, found 0");
 
     cases.add("missing function name and param name",
         \\fn () {}
         \\fn f(i32) {}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     ,
             ".tmp_source.zig:1:1: error: missing function name",
             ".tmp_source.zig:2:6: error: missing parameter name");
 
     cases.add("wrong function type",
         \\const fns = []fn(){ a, b, c };
-        \\fn a() -> i32 {0}
-        \\fn b() -> i32 {1}
-        \\fn c() -> i32 {2}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(fns)) }
+        \\fn a() -> i32 {return 0;}
+        \\fn b() -> i32 {return 1;}
+        \\fn c() -> i32 {return 2;}
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(fns)); }
     , ".tmp_source.zig:1:21: error: expected type 'fn()', found 'fn() -> i32'");
 
     cases.add("extern function pointer mismatch",
         \\const fns = [](fn(i32)->i32){ a, b, c };
-        \\pub fn a(x: i32) -> i32 {x + 0}
-        \\pub fn b(x: i32) -> i32 {x + 1}
-        \\export fn c(x: i32) -> i32 {x + 2}
+        \\pub fn a(x: i32) -> i32 {return x + 0;}
+        \\pub fn b(x: i32) -> i32 {return x + 1;}
+        \\export fn c(x: i32) -> i32 {return x + 2;}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(fns)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(fns)); }
     , ".tmp_source.zig:1:37: error: expected type 'fn(i32) -> i32', found 'extern fn(i32) -> i32'");
 
 
@@ -771,14 +772,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const x : f64 = 1.0;
         \\const y : f32 = x;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     , ".tmp_source.zig:2:17: error: expected type 'f32', found 'f64'");
 
 
     cases.add("colliding invalid top level functions",
         \\fn func() -> bogus {}
         \\fn func() -> bogus {}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(func)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(func)); }
     ,
             ".tmp_source.zig:2:1: error: redefinition of 'func'",
             ".tmp_source.zig:1:14: error: use of undeclared identifier 'bogus'");
@@ -786,7 +787,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("bogus compile var",
         \\const x = @import("builtin").bogus;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(x)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(x)); }
     , ".tmp_source.zig:1:29: error: no member named 'bogus' in '");
 
 
@@ -795,11 +796,11 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    y: [get()]u8,
         \\};
         \\var global_var: usize = 1;
-        \\fn get() -> usize { global_var }
+        \\fn get() -> usize { return global_var; }
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(Foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(Foo)); }
     ,
-            ".tmp_source.zig:5:21: error: unable to evaluate constant expression",
+            ".tmp_source.zig:5:28: error: unable to evaluate constant expression",
             ".tmp_source.zig:2:12: note: called from here",
             ".tmp_source.zig:2:8: note: called from here");
 
@@ -810,7 +811,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\};
         \\const x = Foo {.field = 1} + Foo {.field = 2};
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(x)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(x)); }
     , ".tmp_source.zig:4:28: error: invalid operands to binary expression: 'Foo' and 'Foo'");
 
 
@@ -820,10 +821,10 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const int_x = u32(1) / u32(0);
         \\const float_x = f32(1.0) / f32(0.0);
         \\
-        \\export fn entry1() -> usize { @sizeOf(@typeOf(lit_int_x)) }
-        \\export fn entry2() -> usize { @sizeOf(@typeOf(lit_float_x)) }
-        \\export fn entry3() -> usize { @sizeOf(@typeOf(int_x)) }
-        \\export fn entry4() -> usize { @sizeOf(@typeOf(float_x)) }
+        \\export fn entry1() -> usize { return @sizeOf(@typeOf(lit_int_x)); }
+        \\export fn entry2() -> usize { return @sizeOf(@typeOf(lit_float_x)); }
+        \\export fn entry3() -> usize { return @sizeOf(@typeOf(int_x)); }
+        \\export fn entry4() -> usize { return @sizeOf(@typeOf(float_x)); }
     ,
             ".tmp_source.zig:1:21: error: division by zero is undefined",
             ".tmp_source.zig:2:25: error: division by zero is undefined",
@@ -835,14 +836,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const foo = "a
         \\b";
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:1:13: error: newline not allowed in string literal");
 
     cases.add("invalid comparison for function pointers",
         \\fn foo() {}
         \\const invalid = foo > foo;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(invalid)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(invalid)); }
     , ".tmp_source.zig:2:21: error: operator not allowed for type 'fn()'");
 
     cases.add("generic function instance with non-constant expression",
@@ -851,13 +852,13 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return foo(a, b);
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(test1)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(test1)); }
     , ".tmp_source.zig:3:16: error: unable to evaluate constant expression");
 
     cases.add("assign null to non-nullable pointer",
         \\const a: &u8 = null;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(a)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(a)); }
     , ".tmp_source.zig:1:16: error: expected type '&u8', found '(null)'");
 
     cases.add("indexing an array of size zero",
@@ -870,18 +871,18 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
     cases.add("compile time division by zero",
         \\const y = foo(0);
         \\fn foo(x: u32) -> u32 {
-        \\    1 / x
+        \\    return 1 / x;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     ,
-            ".tmp_source.zig:3:7: error: division by zero is undefined",
+            ".tmp_source.zig:3:14: error: division by zero is undefined",
             ".tmp_source.zig:1:14: note: called from here");
 
     cases.add("branch on undefined value",
         \\const x = if (undefined) true else false;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(x)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(x)); }
     , ".tmp_source.zig:1:15: error: use of undefined value");
 
 
@@ -891,7 +892,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return fibbonaci(x - 1) + fibbonaci(x - 2);
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(seventh_fib_number)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(seventh_fib_number)); }
     ,
             ".tmp_source.zig:3:21: error: evaluation exceeded 1000 backwards branches",
             ".tmp_source.zig:3:21: note: called from here");
@@ -899,7 +900,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
     cases.add("@embedFile with bogus file",
         \\const resource = @embedFile("bogus.txt");
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(resource)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(resource)); }
     , ".tmp_source.zig:1:29: error: unable to find '", "bogus.txt'");
 
     cases.add("non-const expression in struct literal outside function",
@@ -909,7 +910,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const a = Foo {.x = get_it()};
         \\extern fn get_it() -> i32;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(a)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(a)); }
     , ".tmp_source.zig:4:21: error: unable to evaluate constant expression");
 
     cases.add("non-const expression function call with struct return value outside function",
@@ -919,11 +920,11 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const a = get_it();
         \\fn get_it() -> Foo {
         \\    global_side_effect = true;
-        \\    Foo {.x = 13}
+        \\    return Foo {.x = 13};
         \\}
         \\var global_side_effect = false;
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(a)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(a)); }
     ,
             ".tmp_source.zig:6:24: error: unable to evaluate constant expression",
             ".tmp_source.zig:4:17: note: called from here");
@@ -939,21 +940,21 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("illegal comparison of types",
         \\fn bad_eql_1(a: []u8, b: []u8) -> bool {
-        \\    a == b
+        \\    return a == b;
         \\}
         \\const EnumWithData = union(enum) {
         \\    One: void,
         \\    Two: i32,
         \\};
         \\fn bad_eql_2(a: &const EnumWithData, b: &const EnumWithData) -> bool {
-        \\    *a == *b
+        \\    return *a == *b;
         \\}
         \\
-        \\export fn entry1() -> usize { @sizeOf(@typeOf(bad_eql_1)) }
-        \\export fn entry2() -> usize { @sizeOf(@typeOf(bad_eql_2)) }
+        \\export fn entry1() -> usize { return @sizeOf(@typeOf(bad_eql_1)); }
+        \\export fn entry2() -> usize { return @sizeOf(@typeOf(bad_eql_2)); }
     ,
-            ".tmp_source.zig:2:7: error: operator not allowed for type '[]u8'",
-            ".tmp_source.zig:9:8: error: operator not allowed for type 'EnumWithData'");
+            ".tmp_source.zig:2:14: error: operator not allowed for type '[]u8'",
+            ".tmp_source.zig:9:15: error: operator not allowed for type 'EnumWithData'");
 
     cases.add("non-const switch number literal",
         \\export fn foo() {
@@ -964,7 +965,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    };
         \\}
         \\fn bar() -> i32 {
-        \\    2
+        \\    return 2;
         \\}
     , ".tmp_source.zig:2:15: error: unable to infer expression type");
 
@@ -987,56 +988,56 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
     cases.add("negation overflow in function evaluation",
         \\const y = neg(-128);
         \\fn neg(x: i8) -> i8 {
-        \\    -x
+        \\    return -x;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     ,
-            ".tmp_source.zig:3:5: error: negation caused overflow",
+            ".tmp_source.zig:3:12: error: negation caused overflow",
             ".tmp_source.zig:1:14: note: called from here");
 
     cases.add("add overflow in function evaluation",
         \\const y = add(65530, 10);
         \\fn add(a: u16, b: u16) -> u16 {
-        \\    a + b
+        \\    return a + b;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     ,
-            ".tmp_source.zig:3:7: error: operation caused overflow",
+            ".tmp_source.zig:3:14: error: operation caused overflow",
             ".tmp_source.zig:1:14: note: called from here");
 
 
     cases.add("sub overflow in function evaluation",
         \\const y = sub(10, 20);
         \\fn sub(a: u16, b: u16) -> u16 {
-        \\    a - b
+        \\    return a - b;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     ,
-            ".tmp_source.zig:3:7: error: operation caused overflow",
+            ".tmp_source.zig:3:14: error: operation caused overflow",
             ".tmp_source.zig:1:14: note: called from here");
 
     cases.add("mul overflow in function evaluation",
         \\const y = mul(300, 6000);
         \\fn mul(a: u16, b: u16) -> u16 {
-        \\    a * b
+        \\    return a * b;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(y)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(y)); }
     ,
-            ".tmp_source.zig:3:7: error: operation caused overflow",
+            ".tmp_source.zig:3:14: error: operation caused overflow",
             ".tmp_source.zig:1:14: note: called from here");
 
     cases.add("truncate sign mismatch",
         \\fn f() -> i8 {
         \\    const x: u32 = 10;
-        \\    @truncate(i8, x)
+        \\    return @truncate(i8, x);
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
-    , ".tmp_source.zig:3:19: error: expected signed integer type, found 'u32'");
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
+    , ".tmp_source.zig:3:26: error: expected signed integer type, found 'u32'");
 
     cases.add("%return in function with non error return type",
         \\export fn f() {
@@ -1067,16 +1068,16 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("export function with comptime parameter",
         \\export fn foo(comptime x: i32, y: i32) -> i32{
-        \\    x + y
+        \\    return x + y;
         \\}
     , ".tmp_source.zig:1:15: error: comptime parameter not allowed in function with calling convention 'ccc'");
 
     cases.add("extern function with comptime parameter",
         \\extern fn foo(comptime x: i32, y: i32) -> i32;
         \\fn f() -> i32 {
-        \\    foo(1, 2)
+        \\    return foo(1, 2);
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:1:15: error: comptime parameter not allowed in function with calling convention 'ccc'");
 
     cases.add("convert fixed size array to slice with invalid size",
@@ -1090,15 +1091,15 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\var a: u32 = 0;
         \\pub fn List(comptime T: type) -> type {
         \\    a += 1;
-        \\    SmallList(T, 8)
+        \\    return SmallList(T, 8);
         \\}
         \\
         \\pub fn SmallList(comptime T: type, comptime STATIC_SIZE: usize) -> type {
-        \\    struct {
+        \\    return struct {
         \\        items: []T,
         \\        length: usize,
         \\        prealloc_items: [STATIC_SIZE]T,
-        \\    }
+        \\    };
         \\}
         \\
         \\export fn function_with_return_type_type() {
@@ -1113,7 +1114,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\fn f(m: []const u8) {
         \\    m.copy(u8, self[0..], m);
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:3:6: error: no member named 'copy' in '[]const u8'");
 
     cases.add("wrong number of arguments for method fn call",
@@ -1124,7 +1125,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\
         \\    foo.method(1, 2);
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(f)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(f)); }
     , ".tmp_source.zig:6:15: error: expected 2 arguments, found 3");
 
     cases.add("assign through constant pointer",
@@ -1149,7 +1150,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\fn foo(blah: []u8) {
         \\    for (blah) { }
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:2:5: error: for loop expression missing element parameter");
 
     cases.add("misspelled type with pointer only reference",
@@ -1182,7 +1183,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    var jd = JsonNode {.kind = JsonType.JSONArray , .jobject = JsonOA.JSONArray {jll} };
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:5:16: error: use of undeclared identifier 'JsonList'");
 
     cases.add("method call with first arg type primitive",
@@ -1190,9 +1191,9 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    x: i32,
         \\
         \\    fn init(x: i32) -> Foo {
-        \\        Foo {
+        \\        return Foo {
         \\            .x = x,
-        \\        }
+        \\        };
         \\    }
         \\};
         \\
@@ -1209,10 +1210,10 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    allocator: &Allocator,
         \\
         \\    pub fn init(allocator: &Allocator) -> List {
-        \\        List {
+        \\        return List {
         \\            .len = 0,
         \\            .allocator = allocator,
-        \\        }
+        \\        };
         \\    }
         \\};
         \\
@@ -1235,10 +1236,10 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const TINY_QUANTUM_SIZE = 1 << TINY_QUANTUM_SHIFT;
         \\var block_aligned_stuff: usize = (4 + TINY_QUANTUM_SIZE) & ~(TINY_QUANTUM_SIZE - 1);
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(block_aligned_stuff)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(block_aligned_stuff)); }
     , ".tmp_source.zig:3:60: error: unable to perform binary not operation on type '(integer literal)'");
 
-    cases.addCase({
+    cases.addCase(x: {
         const tc = cases.create("multiple files with private function error",
             \\const foo = @import("foo.zig");
             \\
@@ -1253,14 +1254,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
             \\fn privateFunction() { }
         );
 
-        tc
+        break :x tc;
     });
 
     cases.add("container init with non-type",
         \\const zero: i32 = 0;
         \\const a = zero{1};
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(a)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(a)); }
     , ".tmp_source.zig:2:11: error: expected type, found 'i32'");
 
     cases.add("assign to constant field",
@@ -1288,22 +1289,22 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return 0;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(testTrickyDefer)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(testTrickyDefer)); }
     , ".tmp_source.zig:4:11: error: cannot return from defer expression");
 
     cases.add("attempt to access var args out of bounds",
         \\fn add(args: ...) -> i32 {
-        \\    args[0] + args[1]
+        \\    return args[0] + args[1];
         \\}
         \\
         \\fn foo() -> i32 {
-        \\    add(i32(1234))
+        \\    return add(i32(1234));
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     ,
-            ".tmp_source.zig:2:19: error: index 1 outside argument list of size 1",
-            ".tmp_source.zig:6:8: note: called from here");
+            ".tmp_source.zig:2:26: error: index 1 outside argument list of size 1",
+            ".tmp_source.zig:6:15: note: called from here");
 
     cases.add("pass integer literal to var args",
         \\fn add(args: ...) -> i32 {
@@ -1315,11 +1316,11 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\}
         \\
         \\fn bar() -> i32 {
-        \\    add(1, 2, 3, 4)
+        \\    return add(1, 2, 3, 4);
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(bar)) }
-    , ".tmp_source.zig:10:9: error: parameter of type '(integer literal)' requires comptime");
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(bar)); }
+    , ".tmp_source.zig:10:16: error: parameter of type '(integer literal)' requires comptime");
 
     cases.add("assign too big number to u16",
         \\export fn foo() {
@@ -1329,12 +1330,12 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("global variable alignment non power of 2",
         \\const some_data: [100]u8 align(3) = undefined;
-        \\export fn entry() -> usize { @sizeOf(@typeOf(some_data)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(some_data)); }
     , ".tmp_source.zig:1:32: error: alignment value 3 is not a power of 2");
 
     cases.add("function alignment non power of 2",
         \\extern fn foo() align(3);
-        \\export fn entry() { foo() }
+        \\export fn entry() { return foo(); }
     , ".tmp_source.zig:1:23: error: alignment value 3 is not a power of 2");
 
     cases.add("compile log",
@@ -1369,7 +1370,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return *x;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:8:26: error: expected type '&const u3', found '&align(1:3:6) const u3'");
 
     cases.add("referring to a struct that is invalid",
@@ -1405,14 +1406,14 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    bar();
         \\}
-        \\fn bar() -> i32 { 0 }
+        \\fn bar() -> i32 { return 0; }
     , ".tmp_source.zig:2:8: error: expression value is ignored");
 
     cases.add("ignored assert-err-ok return value",
         \\export fn foo() {
         \\    %%bar();
         \\}
-        \\fn bar() -> %i32 { 0 }
+        \\fn bar() -> %i32 { return 0; }
     , ".tmp_source.zig:2:5: error: expression value is ignored");
 
     cases.add("ignored statement value",
@@ -1439,11 +1440,11 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\}
     , ".tmp_source.zig:2:12: error: expression value is ignored");
 
-    cases.add("ignored defered statement value",
+    cases.add("ignored defered function call",
         \\export fn foo() {
         \\    defer bar();
         \\}
-        \\fn bar() -> %i32 { 0 }
+        \\fn bar() -> %i32 { return 0; }
     , ".tmp_source.zig:2:14: error: expression value is ignored");
 
     cases.add("dereference an array",
@@ -1454,7 +1455,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return (*out)[0..1];
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(pass)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(pass)); }
     , ".tmp_source.zig:4:5: error: attempt to dereference non pointer type '[10]u8'");
 
     cases.add("pass const ptr to mutable ptr fn",
@@ -1467,10 +1468,10 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    return true;
         \\}
         \\
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:4:19: error: expected type '&[]const u8', found '&const []const u8'");
 
-    cases.addCase({
+    cases.addCase(x: {
         const tc = cases.create("export collision",
             \\const foo = @import("foo.zig");
             \\
@@ -1486,13 +1487,13 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
             \\pub const baz = 1234;
         );
 
-        tc
+        break :x tc;
     });
 
     cases.add("pass non-copyable type by value to function",
         \\const Point = struct { x: i32, y: i32, };
         \\fn foo(p: Point) { }
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:2:11: error: type 'Point' is not copyable; cannot pass by value");
 
     cases.add("implicit cast from array to mutable slice",
@@ -1515,7 +1516,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\fn foo(e: error) -> u2 {
         \\    return u2(e);
         \\}
-        \\export fn entry() -> usize { @sizeOf(@typeOf(foo)) }
+        \\export fn entry() -> usize { return @sizeOf(@typeOf(foo)); }
     , ".tmp_source.zig:4:14: error: too many error values to fit in 'u2'");
 
     cases.add("asm at compile time",
@@ -1665,17 +1666,17 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("inner struct member shadowing outer struct member",
         \\fn A() -> type {
-        \\    struct {
+        \\    return struct {
         \\        b: B(),
         \\
         \\        const Self = this;
         \\
         \\        fn B() -> type {
-        \\            struct {
+        \\            return struct {
         \\                const Self = this;
-        \\            }
+        \\            };
         \\        }
-        \\    }
+        \\    };
         \\}
         \\comptime {
         \\    assert(A().B().Self != A().Self);
@@ -1691,7 +1692,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) {}
         \\}
-        \\fn bar() -> ?i32 { 1 }
+        \\fn bar() -> ?i32 { return 1; }
     ,
         ".tmp_source.zig:2:15: error: expected type 'bool', found '?i32'");
 
@@ -1699,7 +1700,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) {}
         \\}
-        \\fn bar() -> %i32 { 1 }
+        \\fn bar() -> %i32 { return 1; }
     ,
         ".tmp_source.zig:2:15: error: expected type 'bool', found '%i32'");
 
@@ -1707,7 +1708,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) |x| {}
         \\}
-        \\fn bar() -> bool { true }
+        \\fn bar() -> bool { return true; }
     ,
         ".tmp_source.zig:2:15: error: expected nullable type, found 'bool'");
 
@@ -1715,7 +1716,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) |x| {}
         \\}
-        \\fn bar() -> %i32 { 1 }
+        \\fn bar() -> %i32 { return 1; }
     ,
         ".tmp_source.zig:2:15: error: expected nullable type, found '%i32'");
 
@@ -1723,7 +1724,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) |x| {} else |err| {}
         \\}
-        \\fn bar() -> bool { true }
+        \\fn bar() -> bool { return true; }
     ,
         ".tmp_source.zig:2:15: error: expected error union type, found 'bool'");
 
@@ -1731,7 +1732,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\export fn foo() {
         \\    while (bar()) |x| {} else |err| {}
         \\}
-        \\fn bar() -> ?i32 { 1 }
+        \\fn bar() -> ?i32 { return 1; }
     ,
         ".tmp_source.zig:2:15: error: expected error union type, found '?i32'");
 
@@ -1762,17 +1763,17 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("signed integer division",
         \\export fn foo(a: i32, b: i32) -> i32 {
-        \\    a / b
+        \\    return a / b;
         \\}
     ,
-        ".tmp_source.zig:2:7: error: division with 'i32' and 'i32': signed integers must use @divTrunc, @divFloor, or @divExact");
+        ".tmp_source.zig:2:14: error: division with 'i32' and 'i32': signed integers must use @divTrunc, @divFloor, or @divExact");
 
     cases.add("signed integer remainder division",
         \\export fn foo(a: i32, b: i32) -> i32 {
-        \\    a % b
+        \\    return a % b;
         \\}
     ,
-        ".tmp_source.zig:2:7: error: remainder division with 'i32' and 'i32': signed integers and floats must use @rem or @mod");
+        ".tmp_source.zig:2:14: error: remainder division with 'i32' and 'i32': signed integers and floats must use @rem or @mod");
 
     cases.add("cast negative value to unsigned integer",
         \\comptime {
@@ -1922,17 +1923,17 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("explicit cast float literal to integer when there is a fraction component",
         \\export fn entry() -> i32 {
-        \\    i32(12.34)
+        \\    return i32(12.34);
         \\}
     ,
-        ".tmp_source.zig:2:9: error: fractional component prevents float value 12.340000 from being casted to type 'i32'");
+        ".tmp_source.zig:2:16: error: fractional component prevents float value 12.340000 from being casted to type 'i32'");
 
     cases.add("non pointer given to @ptrToInt",
         \\export fn entry(x: i32) -> usize {
-        \\    @ptrToInt(x)
+        \\    return @ptrToInt(x);
         \\}
     ,
-        ".tmp_source.zig:2:15: error: expected pointer, found 'i32'");
+        ".tmp_source.zig:2:22: error: expected pointer, found 'i32'");
 
     cases.add("@shlExact shifts out 1 bits",
         \\comptime {
@@ -2028,7 +2029,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
 
     cases.add("@alignCast expects pointer or slice",
         \\export fn entry() {
-        \\    @alignCast(4, u32(3))
+        \\    @alignCast(4, u32(3));
         \\}
     ,
         ".tmp_source.zig:2:22: error: expected pointer or slice, found 'u32'");
@@ -2040,7 +2041,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\fn testImplicitlyDecreaseFnAlign(ptr: fn () align(8) -> i32, answer: i32) {
         \\    if (ptr() != answer) unreachable;
         \\}
-        \\fn alignedSmall() align(4) -> i32 { 1234 }
+        \\fn alignedSmall() align(4) -> i32 { return 1234; }
     ,
         ".tmp_source.zig:2:35: error: expected type 'fn() align(8) -> i32', found 'fn() align(4) -> i32'");
 
@@ -2206,17 +2207,17 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\const Mode = @import("builtin").Mode;
         \\
         \\fn Free(comptime filename: []const u8) -> TestCase {
-        \\    TestCase {
+        \\    return TestCase {
         \\        .filename = filename,
         \\        .problem_type = ProblemType.Free,
-        \\    }
+        \\    };
         \\}
         \\
         \\fn LibC(comptime filename: []const u8) -> TestCase {
-        \\    TestCase {
+        \\    return TestCase {
         \\        .filename = filename,
         \\        .problem_type = ProblemType.LinkLibC,
-        \\    }
+        \\    };
         \\}
         \\
         \\const TestCase = struct {
@@ -2374,9 +2375,9 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\pub fn MemoryPool(comptime T: type) -> type {
         \\    const free_list_t = @compileError("aoeu");
         \\
-        \\    struct {
+        \\    return struct {
         \\        free_list: free_list_t,
-        \\    }
+        \\    };
         \\}
         \\
         \\export fn entry() {
@@ -2651,7 +2652,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    C: bool,
         \\};
         \\export fn entry() {
-        \\    var a = Payload { .A = { 1234 } };
+        \\    var a = Payload { .A = 1234 };
         \\}
     ,
         ".tmp_source.zig:6:29: error: extern union does not support enum tag type");
@@ -2668,7 +2669,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    C: bool,
         \\};
         \\export fn entry() {
-        \\    var a = Payload { .A = { 1234 } };
+        \\    var a = Payload { .A = 1234 };
         \\}
     ,
         ".tmp_source.zig:6:29: error: packed union does not support enum tag type");
@@ -2680,7 +2681,7 @@ pub fn addCases(cases: &tests.CompileErrorContext) {
         \\    C: bool,
         \\};
         \\export fn entry() {
-        \\    const a = Payload { .A = { 1234 } };
+        \\    const a = Payload { .A = 1234 };
         \\    foo(a);
         \\}
         \\fn foo(a: &const Payload) {
diff --git a/test/debug_safety.zig b/test/debug_safety.zig
index 36f8d020c..58ebf838b 100644
--- a/test/debug_safety.zig
+++ b/test/debug_safety.zig
@@ -19,7 +19,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    baz(bar(a));
         \\}
         \\fn bar(a: []const i32) -> i32 {
-        \\    a[4]
+        \\    return a[4];
         \\}
         \\fn baz(a: i32) { }
     );
@@ -34,7 +34,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn add(a: u16, b: u16) -> u16 {
-        \\    a + b
+        \\    return a + b;
         \\}
     );
 
@@ -48,7 +48,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn sub(a: u16, b: u16) -> u16 {
-        \\    a - b
+        \\    return a - b;
         \\}
     );
 
@@ -62,7 +62,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn mul(a: u16, b: u16) -> u16 {
-        \\    a * b
+        \\    return a * b;
         \\}
     );
 
@@ -76,7 +76,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 32767) return error.Whatever;
         \\}
         \\fn neg(a: i16) -> i16 {
-        \\    -a
+        \\    return -a;
         \\}
     );
 
@@ -90,7 +90,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 32767) return error.Whatever;
         \\}
         \\fn div(a: i16, b: i16) -> i16 {
-        \\    @divTrunc(a, b)
+        \\    return @divTrunc(a, b);
         \\}
     );
 
@@ -104,7 +104,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn shl(a: i16, b: u4) -> i16 {
-        \\    @shlExact(a, b)
+        \\    return @shlExact(a, b);
         \\}
     );
 
@@ -118,7 +118,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn shl(a: u16, b: u4) -> u16 {
-        \\    @shlExact(a, b)
+        \\    return @shlExact(a, b);
         \\}
     );
 
@@ -132,7 +132,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn shr(a: i16, b: u4) -> i16 {
-        \\    @shrExact(a, b)
+        \\    return @shrExact(a, b);
         \\}
     );
 
@@ -146,7 +146,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn shr(a: u16, b: u4) -> u16 {
-        \\    @shrExact(a, b)
+        \\    return @shrExact(a, b);
         \\}
     );
 
@@ -159,7 +159,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    const x = div0(999, 0);
         \\}
         \\fn div0(a: i32, b: i32) -> i32 {
-        \\    @divTrunc(a, b)
+        \\    return @divTrunc(a, b);
         \\}
     );
 
@@ -173,7 +173,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn divExact(a: i32, b: i32) -> i32 {
-        \\    @divExact(a, b)
+        \\    return @divExact(a, b);
         \\}
     );
 
@@ -187,7 +187,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x.len == 0) return error.Whatever;
         \\}
         \\fn widenSlice(slice: []align(1) const u8) -> []align(1) const i32 {
-        \\    ([]align(1) const i32)(slice)
+        \\    return ([]align(1) const i32)(slice);
         \\}
     );
 
@@ -201,7 +201,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn shorten_cast(x: i32) -> i8 {
-        \\    i8(x)
+        \\    return i8(x);
         \\}
     );
 
@@ -215,7 +215,7 @@ pub fn addCases(cases: &tests.CompareOutputContext) {
         \\    if (x == 0) return error.Whatever;
         \\}
         \\fn unsigned_cast(x: i32) -> u32 {
-        \\    u32(x)
+        \\    return u32(x);
         \\}
     );
 
diff --git a/test/standalone/pkg_import/pkg.zig b/test/standalone/pkg_import/pkg.zig
index a051497fd..52ca88493 100644
--- a/test/standalone/pkg_import/pkg.zig
+++ b/test/standalone/pkg_import/pkg.zig
@@ -1 +1 @@
-pub fn add(a: i32, b: i32) -> i32 { a + b }
+pub fn add(a: i32, b: i32) -> i32 { return a + b; }
diff --git a/test/tests.zig b/test/tests.zig
index a5eb9d4db..a18404512 100644
--- a/test/tests.zig
+++ b/test/tests.zig
@@ -284,7 +284,7 @@ pub const CompareOutputContext = struct {
                     warn("Process {} terminated unexpectedly\n", full_exe_path);
                     return error.TestFailed;
                 },
-            };
+            }
 
 
             if (!mem.eql(u8, self.expected_output, stdout.toSliceConst())) {
@@ -615,7 +615,7 @@ pub const CompileErrorContext = struct {
                     warn("Process {} terminated unexpectedly\n", b.zig_exe);
                     return error.TestFailed;
                 },
-            };
+            }
 
 
             const stdout = stdout_buf.toSliceConst();
@@ -891,7 +891,7 @@ pub const TranslateCContext = struct {
                     warn("Compilation terminated unexpectedly\n");
                     return error.TestFailed;
                 },
-            };
+            }
 
             const stdout = stdout_buf.toSliceConst();
             const stderr = stderr_buf.toSliceConst();
diff --git a/test/translate_c.zig b/test/translate_c.zig
index 4f545139e..cdf900c8b 100644
--- a/test/translate_c.zig
+++ b/test/translate_c.zig
@@ -203,13 +203,13 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\pub extern var fn_ptr: ?extern fn();
     ,
         \\pub inline fn foo() {
-        \\    (??fn_ptr)()
+        \\    return (??fn_ptr)();
         \\}
     ,
         \\pub extern var fn_ptr2: ?extern fn(c_int, f32) -> u8;
     ,
         \\pub inline fn bar(arg0: c_int, arg1: f32) -> u8 {
-        \\    (??fn_ptr2)(arg0, arg1)
+        \\    return (??fn_ptr2)(arg0, arg1);
         \\}
     );
 
@@ -475,10 +475,10 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\pub export fn max(a: c_int) {
         \\    var b: c_int;
         \\    var c: c_int;
-        \\    c = {
+        \\    c = x: {
         \\        const _tmp = a;
         \\        b = _tmp;
-        \\        _tmp
+        \\        break :x _tmp;
         \\    };
         \\}
     );
@@ -613,9 +613,9 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\}
     ,
         \\pub export fn foo() -> c_int {
-        \\    return {
+        \\    return x: {
         \\        _ = 1;
-        \\        2
+        \\        break :x 2;
         \\    };
         \\}
     );
@@ -645,45 +645,45 @@ pub fn addCases(cases: &tests.TranslateCContext) {
     ,
         \\pub export fn foo() {
         \\    var a: c_int = 0;
-        \\    a += {
+        \\    a += x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) + 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a -= {
+        \\    a -= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) - 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a *= {
+        \\    a *= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) * 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a &= {
+        \\    a &= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) & 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a |= {
+        \\    a |= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) | 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a ^= {
+        \\    a ^= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) ^ 1);
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a >>= @import("std").math.Log2Int(c_int)({
+        \\    a >>= @import("std").math.Log2Int(c_int)(x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) >> @import("std").math.Log2Int(c_int)(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    });
-        \\    a <<= @import("std").math.Log2Int(c_int)({
+        \\    a <<= @import("std").math.Log2Int(c_int)(x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) << @import("std").math.Log2Int(c_int)(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    });
         \\}
     );
@@ -703,45 +703,45 @@ pub fn addCases(cases: &tests.TranslateCContext) {
     ,
         \\pub export fn foo() {
         \\    var a: c_uint = c_uint(0);
-        \\    a +%= {
+        \\    a +%= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) +% c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a -%= {
+        \\    a -%= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) -% c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a *%= {
+        \\    a *%= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) *% c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a &= {
+        \\    a &= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) & c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a |= {
+        \\    a |= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) | c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a ^= {
+        \\    a ^= x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) ^ c_uint(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    a >>= @import("std").math.Log2Int(c_uint)({
+        \\    a >>= @import("std").math.Log2Int(c_uint)(x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) >> @import("std").math.Log2Int(c_uint)(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    });
-        \\    a <<= @import("std").math.Log2Int(c_uint)({
+        \\    a <<= @import("std").math.Log2Int(c_uint)(x: {
         \\        const _ref = &a;
         \\        (*_ref) = ((*_ref) << @import("std").math.Log2Int(c_uint)(1));
-        \\        *_ref
+        \\        break :x *_ref;
         \\    });
         \\}
     );
@@ -778,29 +778,29 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\    i -= 1;
         \\    u +%= 1;
         \\    u -%= 1;
-        \\    i = {
+        \\    i = x: {
         \\        const _ref = &i;
         \\        const _tmp = *_ref;
         \\        (*_ref) += 1;
-        \\        _tmp
+        \\        break :x _tmp;
         \\    };
-        \\    i = {
+        \\    i = x: {
         \\        const _ref = &i;
         \\        const _tmp = *_ref;
         \\        (*_ref) -= 1;
-        \\        _tmp
+        \\        break :x _tmp;
         \\    };
-        \\    u = {
+        \\    u = x: {
         \\        const _ref = &u;
         \\        const _tmp = *_ref;
         \\        (*_ref) +%= 1;
-        \\        _tmp
+        \\        break :x _tmp;
         \\    };
-        \\    u = {
+        \\    u = x: {
         \\        const _ref = &u;
         \\        const _tmp = *_ref;
         \\        (*_ref) -%= 1;
-        \\        _tmp
+        \\        break :x _tmp;
         \\    };
         \\}
     );
@@ -826,25 +826,25 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\    i -= 1;
         \\    u +%= 1;
         \\    u -%= 1;
-        \\    i = {
+        \\    i = x: {
         \\        const _ref = &i;
         \\        (*_ref) += 1;
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    i = {
+        \\    i = x: {
         \\        const _ref = &i;
         \\        (*_ref) -= 1;
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    u = {
+        \\    u = x: {
         \\        const _ref = &u;
         \\        (*_ref) +%= 1;
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
-        \\    u = {
+        \\    u = x: {
         \\        const _ref = &u;
         \\        (*_ref) -%= 1;
-        \\        *_ref
+        \\        break :x *_ref;
         \\    };
         \\}
     );
@@ -1037,7 +1037,7 @@ pub fn addCases(cases: &tests.TranslateCContext) {
         \\pub const glClearPFN = PFNGLCLEARPROC;
     ,
         \\pub inline fn glClearUnion(arg0: GLbitfield) {
-        \\    (??glProcs.gl.Clear)(arg0)
+        \\    return (??glProcs.gl.Clear)(arg0);
         \\}
     ,
         \\pub const OpenGLProcs = union_OpenGLProcs;