translate-c-2 bug fixes

- fix use of undefined value
- fix parenexprclass result not being suppressed
- add an error and a TODO for access of an anonymous field

src-self-hosted/stage1.zig

@@ -95,7 +95,7 @@ export fn stage2_translate_c(
     args_end: [*]?[*]const u8,
     resources_path: [*:0]const u8,
 ) Error {
-    var errors: []translate_c.ClangErrMsg = undefined;
+    var errors = @as([*]translate_c.ClangErrMsg, undefined)[0..0];
     out_ast.* = translate_c.translate(std.heap.c_allocator, args_begin, args_end, &errors, resources_path) catch |err| switch (err) {
         error.SemanticAnalyzeFail => {
             out_errors_ptr.* = errors.ptr;

src-self-hosted/translate_c.zig

@@ -853,15 +853,15 @@ fn transStmt(
         .ReturnStmtClass => return transReturnStmt(rp, scope, @ptrCast(*const ZigClangReturnStmt, stmt)),
         .StringLiteralClass => return transStringLiteral(rp, scope, @ptrCast(*const ZigClangStringLiteral, stmt), result_used),
         .ParenExprClass => {
-            const expr = try transExpr(rp, scope, ZigClangParenExpr_getSubExpr(@ptrCast(*const ZigClangParenExpr, stmt)), result_used, lrvalue);
+            const expr = try transExpr(rp, scope, ZigClangParenExpr_getSubExpr(@ptrCast(*const ZigClangParenExpr, stmt)), .used, lrvalue);
-            if (expr.id == .GroupedExpression) return expr;
+            if (expr.id == .GroupedExpression) return maybeSuppressResult(rp, scope, result_used, expr);
             const node = try rp.c.a().create(ast.Node.GroupedExpression);
             node.* = .{
                 .lparen = try appendToken(rp.c, .LParen, "("),
                 .expr = expr,
                 .rparen = try appendToken(rp.c, .RParen, ")"),
             };
-            return &node.base;
+            return maybeSuppressResult(rp, scope, result_used, &node.base);
         },
         .InitListExprClass => return transInitListExpr(rp, scope, @ptrCast(*const ZigClangInitListExpr, stmt), result_used),
         .ImplicitValueInitExprClass => return transImplicitValueInitExpr(rp, scope, @ptrCast(*const ZigClangExpr, stmt), result_used),
@@ -2098,6 +2098,9 @@ fn transMemberExpr(rp: RestorePoint, scope: *Scope, stmt: *const ZigClangMemberE
     }
 
     const name = try rp.c.str(ZigClangDecl_getName_bytes_begin(@ptrCast(*const ZigClangDecl, ZigClangMemberExpr_getMemberDecl(stmt))));
+    if (name.len == 0) {
+        return revertAndWarn(rp, error.UnsupportedTranslation, ZigClangStmt_getBeginLoc(@ptrCast(*const ZigClangStmt, stmt)), "TODO access of anonymous field", .{});
+    }
     const node = try transCreateNodeFieldAccess(rp.c, container_node, name);
     return maybeSuppressResult(rp, scope, result_used, node);
 }