anchor.diff:    test_noReceiver_getter_thisClass() async {
       await assertNoErrorsInCode(r'''
   class C {
  -  double Function(int) get foo => null;
  +  double Function(int) get foo => throw Error();
   
     void bar() {
       foo(0);
  
positive.code: 
    test_error_wrongNumberOfTypeArgumentsMethod_21() async {
      await assertErrorsInCode(r'''
  Map<T, U> foo<T extends num, U>() => null;
  
  main() {
    foo<int>();
  }
  ''', [
        error(CompileTimeErrorCode.WRONG_NUMBER_OF_TYPE_ARGUMENTS_METHOD, 58, 5),
      ]);
      assertMethodInvocation(
        findNode.methodInvocation('foo<int>()'),
  
negative.code: 
    test_noReceiver_topVariable() async {
      await assertNoErrorsInCode(r'''
  void Function(int) foo = throw Error();
  
  main() {
    foo(0);
  