static <A extends JComponent> A componentPopupMenuItem(A c, S name, Runnable action) {
  componentPopupMenu(c, voidfunc(JPopupMenu menu) {
    addMenuItem(menu, name, action);
  });
  ret c;
}

static void componentPopupMenuItem(JComponent c, JMenuItem menuItem) {
  componentPopupMenu(c, voidfunc(JPopupMenu menu) {
    addMenuItem(menu, menuItem);
  });
}