[tests] Add void value in record regression test

Issue: #52593
Change-Id: I493da856cea05ab8cbb01900d1df3d423ce46f59
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/308244
Reviewed-by: Mark Zhou <[email protected]>

Author: nshahan

tests/language/records/regress52593_test.dart

@@ -0,0 +1,26 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// Regression test for https://github.com/dart-lang/sdk/issues/52593.
+///
+/// Adding the value returned from a method with a static return type of `void`
+/// to a record and getting the value should not cause a runtime error.
+
+import 'package:expect/expect.dart';
+
+(Object?,) fn1() => (fn2() as Object?,);
+void fn2() {}
+
+@pragma('dart2js:noInline')
+@pragma('dart2js:assumeDynamic')
+confuse(x) {
+  return x;
+}
+
+void main() {
+  var r = fn1();
+  Expect.isNull(r.$1);
+  var d = confuse(fn1());
+  Expect.isNull(d.$1);
+}