Create a native JavaScript method

    public static native void alert() /*-{
      $wnd.alert("AAA");
    }-*/;

and try to change its name. IDEA will insert strange code in the comment:

    public static native void alert1() /*-{function alert1 ( /*window*/$wnd,/*Document*/$doc) {
      $wnd.alert("AAA");
    }-*/;