[Vala] Snoop warnings

[James Campos <james r campos gmail com>]

Hi,

I'm getting warnings when I use the key_snooper_install function. Am I
doing something wrong, or is this a known issue? Using Vala 0.7.8:

using Gtk;

public class Foo : Window {

        public Foo () {
                key_snooper_install (snoop_callback, null);
        }

        public int snoop_callback () {
                return 0;
        }

        public static int main (string[] args) {
                Gtk.init (ref args);

                var window = new Foo ();
                window.destroy.connect (Gtk.main_quit);
                window.show_all ();

                Gtk.main ();
                return 0;
        }
}

/home/james/code/vala/scratch.vala.c: In function
‘_foo_snoop_callback_gtk_key_snoop_func’:
/home/james/code/vala/scratch.vala.c:51: warning: passing argument 1
of ‘foo_snoop_callback’ from incompatible pointer type
/home/james/code/vala/scratch.vala.c:41: note: expected ‘struct Foo *’
but argument is of type ‘struct GtkWidget *’