anchor.diff:      expect(element.name, 'myLabel');
       {
         Location location = element.location;
  -      expect(location.file, '/test.dart');
  +      expect(location.file, convertPath('/test.dart'));
         expect(location.offset, 9);
         expect(location.length, 'myLabel'.length);
         expect(location.startLine, 2);
  
positive.code:       expect(element.name, 'index');
        {
          Location location = element.location;
          expect(location.file, '/test.dart');
          expect(location.offset, -1);
          expect(location.length, 'index'.length);
          expect(location.startLine, 1);
  
negative.code:       expect(element.typeParameters, isNull);
        {
          Location location = element.location;
          expect(location.file, convertPath('/test.dart'));
          expect(location.offset, 17);
          expect(location.length, '_E1'.length);
          expect(location.startLine, 2);
  