anchor.diff:              sdkRoot.toFilePath(),
               _sdkDevRuntime,
               'patched_sdk',
  -            if (nnbd) 'sdk_nnbd'
  +            if (_nnbd) 'sdk_nnbd'
             ],
             root.toFilePath());
         _checkExitCode(result, this, module);
  
positive.code: String _test_package = 'ddc_modular_test';
  
  Uri sdkRoot = Platform.script.resolve("../../../");
  Options _options;
  String _dartdevcScript;
  String _buildSdkScript;
  
negative.code: 
      ProcessResult result;
  
      _nnbd = flags.contains('non-nullable');
      bool allowErrors = _nnbd && _nnbdOptOut.contains(module.name);
  
      if (module.isSdk) {
        assert(transitiveDependencies.isEmpty);
  