anchor.diff:    }
   """;
   
  -const String TEST_8 = @"""
  +const String TEST_8 = r"""
     class A {
       int f;
       A(x) {
  
positive.code:   }
  """;
  
  const String TEST_14 = @"""
    class A {
      var f;
      A() { f = 1; }
  
negative.code:   }
  """;
  
  const String TEST_12 = r"""
    class S {
      int fs = 1;
      S() { fs = "2"; }
  