anchor.diff:      bool first = true;
       for (int i = 0; i < node.requiredParameterCount; i++) {
         if (!first) result.add(", ");
  -      result.addAll(node.positionalParameters[i].accept(this));
  +      node.positionalParameters[i].accept(this);
         first = false;
       }
       if (node.positionalParameters.length > node.requiredParameterCount) {
  
positive.code:   List<Object> labelConstant(Constant constant) {
      // TODO(askesc): Remove null check when we are completely null clean here.
      if (constant == null) return ["null-constant"];
      return constant.accept(this);
    }
  
    /// Get a textual description of the origins of the raw types appearing in
  
negative.code:           // Bound was not specified, and therefore should not be printed.
          } else {
            result.add(" extends ");
            param.bound.accept(this);
          }
        }
        result.add(">");
  