-/* Toggle display of a window "win". */
-extern void toggle_window(struct WinMeta * win_meta, struct Win * win);
+/* Toggle display of a window "win".
+ *
+ * Return 0 on success, 1 on (ncurses pad/window memory allocation) error.
+ */
+extern uint8_t toggle_window(struct WinMeta * win_meta, struct Win * win);