ability to give comptime and non-comptime types to same parameter

lib/std/fmt.zig

@@ -469,6 +469,7 @@ pub fn formatType(
         .Fn => {
             return format(context, Errors, output, "{}@{x}", .{ @typeName(T), @ptrToInt(value) });
         },
+        .Type => return output(context, @typeName(T)),
         else => @compileError("Unable to format type '" ++ @typeName(T) ++ "'"),
     }
 }

src/ir.cpp

@@ -17359,8 +17359,18 @@ static bool ir_analyze_fn_call_generic_arg(IrAnalyze *ira, AstNode *fn_proto_nod
         }
     }
 
-    bool comptime_arg = param_decl_node->data.param_decl.is_comptime ||
+    bool comptime_arg = param_decl_node->data.param_decl.is_comptime;
-        casted_arg->value->type->id == ZigTypeIdComptimeInt || casted_arg->value->type->id == ZigTypeIdComptimeFloat;
+    if (!comptime_arg) {
+        switch (type_requires_comptime(ira->codegen, casted_arg->value->type)) {
+        case ReqCompTimeInvalid:
+            return false;
+        case ReqCompTimeYes:
+            comptime_arg = true;
+            break;
+        case ReqCompTimeNo:
+            break;
+        }
+    }
 
     ZigValue *arg_val;
 
@@ -17395,17 +17405,6 @@ static bool ir_analyze_fn_call_generic_arg(IrAnalyze *ira, AstNode *fn_proto_nod
     }
 
     if (!comptime_arg) {
-        switch (type_requires_comptime(ira->codegen, casted_arg->value->type)) {
-        case ReqCompTimeYes:
-            ir_add_error(ira, casted_arg,
-                buf_sprintf("parameter of type '%s' requires comptime", buf_ptr(&casted_arg->value->type->name)));
-            return false;
-        case ReqCompTimeInvalid:
-            return false;
-        case ReqCompTimeNo:
-            break;
-        }
-
         casted_args[fn_type_id->param_count] = casted_arg;
         FnTypeParamInfo *param_info = &fn_type_id->param_info[fn_type_id->param_count];
         param_info->type = casted_arg->value->type;

test/stage1/behavior/fn.zig

@@ -255,3 +255,20 @@ test "function call with anon list literal" {
     S.doTheTest();
     comptime S.doTheTest();
 }
+
+test "ability to give comptime types and non comptime types to same parameter" {
+    const S = struct {
+        fn doTheTest() void {
+            var x: i32 = 1;
+            expect(foo(x) == 10);
+            expect(foo(i32) == 20);
+        }
+
+        fn foo(arg: var) i32 {
+            if (@typeInfo(@typeOf(arg)) == .Type and arg == i32) return 20;
+            return 9 + arg;
+        }
+    };
+    S.doTheTest();
+    comptime S.doTheTest();
+}