anchor.diff:    foo()();
   }
   ''', [
  +      if (typeToStringWithNullability)
  +        error(CompileTimeErrorCode.UNCHECKED_USE_OF_NULLABLE_VALUE, 26, 5),
         error(CompileTimeErrorCode.USE_OF_VOID_RESULT, 26, 3),
       ]);
       assertMethodInvocation(
  
positive.code:     assertMethodInvocation(
        invocation,
        findElement.topFunction('foo'),
        'void Function({int a, bool b})',
      );
      assertNamedParameterRef('b: false', 'b');
      assertNamedParameterRef('a: 0', 'a');
  
negative.code: 
    test_noReceiver_topGetter() async {
      await assertNoErrorsInCode(r'''
  double Function(int) get foo => throw Error();
  
  main() {
    foo(0);
  