anchor.diff:      var library = await checkLibrary('@a import "foo.dart"; const a = b;');
       checkElementText(
           library,
  -        r'''
  +        '''
   import 'foo.dart';
     metadata
       Annotation
  
positive.code: const int a;
    constantInitializer
      SimpleIdentifier
        staticElement: file:///foo.dart::@getter::b
        staticType: int
        token: b
  ''',
  
negative.code: 
  /// Mixin containing helper methods for testing summary resynthesis.  Intended
  /// to be applied to a class implementing [ResynthesizeTestStrategy].
  mixin ResynthesizeTestHelpers
      implements ResynthesizeTestStrategy, ResourceProviderMixin {
    Future<LibraryElementImpl /*!*/ > checkLibrary(String text,
        {bool allowErrors = false, bool dumpSummaries = false}) async {
      throw 42;
  