anchor.diff:  '''));
     });
   }
  +
  +String _pathToFileUri(String pathString) {
  +  pathString = path.absolute(pathString);
  +  if (Platform.operatingSystem != 'windows') return 'file://$pathString';
  +  return 'file:///${pathString.replaceAll("\\", "/")}';
  +}
  
positive.code:   });
  
    test('.toString() nicely formats the stack trace', () {
      var absolute = path.absolute(path.join('foo', 'bar.dart'));
      var trace = new Trace.parse('''
  #0      Foo._bar (file://$absolute:42:21)
  #1      zip.<anonymous closure>.zap (dart:async:0:2)
  #2      zip.<anonymous closure>.zap (http://pub.dartlang.org/thing.dart:1:100)
  ''');
  
negative.code: 
  library trace_test;
  
  import 'dart:io';
  import 'dart:uri';
  
  import 'package:pathos/path.dart' as path;
  