From 3d8c1a7e97521e73703e198d1383839c201787ec Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 11 Sep 2017 22:46:34 +0900
Subject: The ensure stack may be empty at `OP_EPOP`; fix 1st part of #3809

---
 src/vm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/vm.c b/src/vm.c
index 3b8119c67..ee5a0fd9e 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1322,10 +1322,13 @@ RETRY_TRY_BLOCK:
       mrb_callinfo *ci, *nci;
       mrb_value self = regs[0];
 
-      /* temporary limitation */
-      mrb_assert(a==1);
-      proc = mrb->c->ensure[--mrb->c->eidx];
+      mrb_assert(a==1);         /* temporary limitation */
       ci = mrb->c->ci;
+      if (mrb->c->eidx == ci->epos) {
+        NEXT;
+      }
+
+      proc = mrb->c->ensure[--mrb->c->eidx];
       nci = cipush(mrb);
       nci->mid = ci->mid;
       nci->argc = 0;
-- 
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