private void ensureParenthesisAroundParameterList() {
    //lambda parameter without parenthesis
    if (findChildByRole(ChildRole.LPARENTH) == null) {
      addLeaf(JavaTokenType.LPARENTH, "(", getFirstChildNode());
      addLeaf(JavaTokenType.RPARENTH, ")", null);
    }
  }
private void ensureParenthesisAroundParameterList()