anchor.diff:    regex = new RegExp(r"(\w+)");
     String str = "Parse my string";
     Iterable<Match> matches = regex.allMatches(str);  // Run to generate bytecode.
  -  Expect.equals(3, matches.length);
  +  expect(matches.length, equals(3));
   }
   
   var tests = [
  
positive.code: // VMOptions=
  // VMOptions=--interpret_irregexp
  
  import "package:expect/expect.dart";
  import 'package:observatory/service_io.dart';
  import 'package:unittest/unittest.dart';
  import 'test_helper.dart';
  
negative.code: ];
  
  main(args) => runIsolateTests(args, tests, testeeBefore: script);
  