anchor.diff:    test_ArgumentList_local_function_2() async {
       // ArgumentList  MethodInvocation  ExpressionStatement  Block
       addTestSource('''
  -      import '${convertPathForImport('/libA.dart')}'
         expect(arg1, int arg2) { }
         class B { }
         String bar() => true;
  
positive.code:   test_ArgumentList_local_function_3b() async {
      // ArgumentList  MethodInvocation  ExpressionStatement  Block
      addTestSource('''
        import '${convertPathForImport('/libA.dart')}'
        expect(arg1, int arg2, {bool arg3}) { }
        class B { }
        String bar() => true;
  
negative.code:   test_ArgumentList_local_function_1() async {
      // ArgumentList  MethodInvocation  ExpressionStatement  Block
      addTestSource('''
        expect(arg) { }
        class B { }
        String bar() => true;
  