anchor.diff:  
     void write(String string) {
       sink.write(string);
  +    column += string.length;
     }
   
     void writeSpace([String string = ' ']) {
  
positive.code:     }
      write('\n');
      state = SPACE;
    }
  
    void writeFunction(FunctionNode function,
  
negative.code:   final Annotator annotator;
    ImportTable importTable;
    int indentation = 0;
    int column = 0;
  
    static int SPACE = 0;
    static int WORD = 1;
  