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