pub unsafe extern "C" fn g_cclosure_new(
callback_func: GCallback,
user_data: gpointer,
destroy_data: GClosureNotify,
) -> *mut GClosure
pub unsafe extern "C" fn g_cclosure_new(
callback_func: GCallback,
user_data: gpointer,
destroy_data: GClosureNotify,
) -> *mut GClosure