anchor.diff:  }
   
   class C {
  -  A a;
  +  A a = A();
   }
   
   f(C c) {
  
positive.code: main() {
    defineReflectiveSuite(() {
      defineReflectiveTests(InvalidAssignmentTest);
    });
  }
  
  @reflectiveTest
  
negative.code: // 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.
  
  import 'package:analyzer/dart/analysis/features.dart';
  import 'package:analyzer/src/error/codes.dart';
  import 'package:analyzer/src/generated/engine.dart';
  import 'package:test_reflective_loader/test_reflective_loader.dart';
  
  import '../dart/resolution/driver_resolution.dart';
  