anchor.diff:    }
   
     /**
  -   * Throw away any information produced by a previous call to [link].
  +   * Throw away any information stored in the summary by a previous call to
  +   * [link].
      */
     void unlink() {
       _linkedLibrary.dependencies.length =
  
positive.code:       parameterElement.link(compilationUnit);
      }
    }
  
    /**
     * Throw away any information produced by type inference.
     */
    void unlink() {
      for (ParameterElementForLink parameterElement in parameters) {
        parameterElement.unlink();
      }
      _inferredReturnType = null;
    }
  }
  
  /**
  
negative.code:   }
  
    /**
     * Throw away any information stored in the summary by a previous call to
     * [link].
     */
    void unlink() {
      _linkedUnit.constCycles.clear();
      _linkedUnit.references.length = _unlinkedUnit.references.length;
      _linkedUnit.types.clear();
    }
  
    /**
  