pub unsafe extern "C" fn gtk_icon_info_load_symbolic_async(
    icon_info: *mut GtkIconInfo,
    fg: *const GdkRGBA,
    success_color: *const GdkRGBA,
    warning_color: *const GdkRGBA,
    error_color: *const GdkRGBA,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer
)