anchor.diff:      _buffer.writeCharCode($asterisk);
     }
   
  -  // Utilities
  +  // ## Utilities
   
     void _visitChildren(Iterable<CssNode> children) {
       _buffer.writeCharCode($lbrace);
  
positive.code:     return doubleQuote ? '"$buffer"' : "'$buffer'";
    }
  
    // Selectors
  
    void visitAttributeSelector(AttributeSelector attribute) {
      _buffer.writeCharCode($lbracket);
  
negative.code:     }
    }
  
    // ## Expressions
  
    void visitBoolean(SassBoolean value) =>
        _buffer.write(value.value.toString());
  