anchor.diff:      ]).toTrace();
   
       expect(trace.toString(), equals(
  -        'user/code.dart 10:11  Foo.bar\n'
  +        '$userSlashCode 10:11  Foo.bar\n'
           'dart:core 10:11       Bar.baz\n'
  -        'user/code.dart 10:11  Foo.bar\n'
  +        '$userSlashCode 10:11  Foo.bar\n'
           'dart:core 10:11       Bar.baz\n'));
     });
   
  
positive.code: 
  import 'dart:async';
  
  import 'package:stack_trace/stack_trace.dart';
  import 'package:unittest/unittest.dart';
  
  
negative.code:     });
    });
  
    var userSlashCode = p.join('user', 'code.dart');
    group('Chain.terse', () {
      test('makes each trace terse', () {
        var chain = new Chain([
  