anchor.diff:    /// Returns a boolean value to prevent the client from re-authorizing itself
     /// for multiple tests.
     Future<bool> clientIsAuthorized() async {
  -    final File authFile = workDirectory?.childFile(fs.path.join(
  +    final File authFile = workDirectory.childFile(fs.path.join(
         'temp',
         'auth_opt.json',
  -    ));
  +    ))/*!*/;
   
       if(await authFile.exists()) {
         final String contents = await authFile.readAsString();
         final Map<String, dynamic> decoded = json.decode(contents) as Map<String, dynamic>;
  -      return !(decoded['GSUtil'] as bool);
  +      return !(decoded['GSUtil'] as bool/*!*/);
       }
       return false;
     }
  
positive.code:   /// Returns a list of arguments for initializing a tryjob based on the testing
    /// environment.
    List<String> getCIArguments() {
      String pullRequest;
      String jobId;
      String cis;
  
      switch (ci) {
        case ContinuousIntegrationEnvironment.luci:
          jobId = platform.environment['LOGDOG_STREAM_PREFIX'].split('/').last;
          final List<String> refs = platform.environment['GOLD_TRYJOB'].split('/');
  
negative.code:       return;
  
      List<String> authArguments;
      /*late*/ String failureContext;
  
      switch (ci/*!*/) {
        case ContinuousIntegrationEnvironment.luci:
          authArguments = <String>[
            'auth',
  