anchor.diff:  // VMOptions=
   // VMOptions=--interpret_irregexp
   
  -import "package:expect/expect.dart";
   import 'package:observatory/service_io.dart';
   import 'package:unittest/unittest.dart';
   import 'test_helper.dart';
  
positive.code:   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);
  }
  
  var tests = [
  
negative.code: ];
  
  main(args) => runIsolateTests(args, tests, testeeBefore: script);
  