u3: initializes head/tail in u3i_defcons() (under U3_MEMORY_DEBUG)
@@ -480,8 +480,11 @@ u3i_defcons(u3_noun** hed, u3_noun** tel)
nov_u->mug_w = 0;
- // XX zero-initialize head and tail?
- //
+#ifdef U3_MEMORY_DEBUG
+ nov_u->hed = u3_none;
+ nov_u->tel = u3_none;
+#endif
+
*hed = &nov_u->hed;
*tel = &nov_u->tel;
