Fixed out-of-bounds access of `ensure[]`; ref
@@ -1142,7 +1142,7 @@ RETRY_TRY_BLOCK:
p = mrb_closure_new(mrb, irep->reps[GETARG_Bx(i)]);
/* push ensure_stack */
- if (mrb->c->esize <= mrb->c->ci->eidx) {
+ if (mrb->c->esize <= mrb->c->ci->eidx+1) {
if (mrb->c->esize == 0) mrb->c->esize = 16;
else mrb->c->esize *= 2;
mrb->c->ensure = (struct RProc **)mrb_realloc(mrb, mrb->c->ensure, sizeof(struct RProc*) * mrb->c->esize);
