code: private List<Node> createStringsFromParamList(Node params) {
      Node param = params.getFirstChild();
      ArrayList<Node> names = new ArrayList<>();
      while (param != null) {
        if (param.isName()) {
          names.add(IR.string(param.getString()).srcref(param));
        } else if (param.isDestructuringPattern()) {
          compiler.report(JSError.make(param,
              INJECTED_FUNCTION_HAS_DESTRUCTURED_PARAM));
          return new ArrayList<>();
        } else if (param.isDefaultValue()) {
          compiler.report(JSError.make(param,
              INJECTED_FUNCTION_HAS_DEFAULT_VALUE));
          return new ArrayList<>();
        }
        param = param.getNext();
      }
      return names;
    }
docs: Given a PARAM_LIST node creates an array of corresponding STRING nodes.
  @param params PARAM_LIST node.
  @return array of STRING nodes.