anchor.diff:    }
   
     ColorizeString call(String text) {
  -    this.initial = text;
  -    this.wrapped = text;
  -    return this;
  +    return new ColorizeString(text);
     }
   
     String buildEscSeq(String style) {
  
positive.code:   ColorizeString apply(String style, [String text]) {
  
      if (text == null) {
        text = wrapped;
      }
  
      wrapped = _stylize(style, text);
      return this;
  
    }
  
    String _stylize(String style, String text) {
  
negative.code:   static final String ESC = "\u{1B}";
  
    String initial = '';
  
    ColorizeString([this.initial = '']);
  
    String toString() {
      return initial;
    }
  
    ColorizeString noSuchMethod(Invocation mirror) {
  