anchor.diff:      addSource('/testB.dart', '''
   class B { }''');
       addTestSource('''
  -import "/testB.dart";
  +import "${convertPathForImport("/testB.dart")}";
   class A {var b; X _c;}
   class X{}
   main() {A a; a..^z}''');
  
positive.code: F1() { }
  class A {A(this.x) { } int x;}''');
      addTestSource('''
  import "/testA.dart";
  import "dart:async";
  int T2;
  F2() { }
  
negative.code: class X { }
  class Y { }''');
      addTestSource('''
  import "${convertPathForImport("/testB.dart")}" as b;
  var T2;
  class A { }
  foo(b.^ f) {}''');
  