anchor.diff:            f.uri.toString().contains("/packages/")) &&
         f.uri.toString().endsWith("/.packages")));
   
  +  List<String> allCompilationErrors = [];
     for (File dotPackage in dotPackagesFiles) {
       Directory tempDir;
       Directory systemTempDir = Directory.systemTemp;
  
positive.code: 
    print("Did $compilations compilations and verifications in "
        "${stopwatch.elapsedMilliseconds} ms.");
  }
  
  // The below is copied from incremental_compiler_test.dart,
  
negative.code:   String _boundaryKey;
    bool _readingSources;
  
    List<String> allReceived = new List<String>();
  
    void listener(String s) {
      allReceived.add(s);
      if (_boundaryKey == null) {
        const String RESULT_OUTPUT_SPACE = 'result ';
        if (s.startsWith(RESULT_OUTPUT_SPACE)) {
  