From a42b676ae928249d6a6f6a3a370d84b29bb2a613 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 20 Dec 2021 17:45:10 +0900
Subject: vm.c: fix a half-baked implementation of `OP_SETIDX`; ref #5608

---
 src/vm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/vm.c b/src/vm.c
index e187d162c..1a411b534 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1383,7 +1383,6 @@ RETRY_TRY_BLOCK:
         break;
       default:
       getidx_fallback:
-        c = 1;
         mid = MRB_OPSYM(aref);
         goto L_SEND_SYM;
       }
@@ -1393,7 +1392,8 @@ RETRY_TRY_BLOCK:
     CASE(OP_SETIDX, B) {
       c = 2;
       mid = MRB_OPSYM(aset);
-      goto L_SEND_SYM;
+      SET_NIL_VALUE(regs[a+3]);
+      goto L_SENDB_SYM;
     }
 
     CASE(OP_GETCONST, BB) {
-- 
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