fix one new build warning
@@ -6,6 +6,10 @@ static void _test_cache_trimming(void);
static void _test_no_cache(void);
static void _test_skip_slot(void);
+// defined in noun/hashtable.c
+c3_w _ch_skip_slot(c3_w mug_w, c3_w lef_w);
+
+
/* main(): run all test cases.
*/
int
