key-data.c (key_struct{set,steal}): Assert no other references.

Otherwise I predict serious trouble when someone gets the reference
counting wrong.

diff --git a/key-data.c b/key-data.c
index 43ad901..0e79b32 100644 (file)
--- a/key-data.c
+++ b/key-data.c
@@ -350,6 +350,7 @@ static void structset(key_data *k, int stealp,
   unsigned f;
 
   assert(((void)"Key is not structured", k->e == KENC_STRUCT));
+  assert(((void)"Key has multiple references", k->ref == 1));
   if (!kd) {
     ks = sym_find(&k->u.s, tag, -1, 0, 0);
     if (ks) sym_remove(&k->u.s, ks);