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