From 3a15d18ebbe31e4f48e84125820a6a2bec8fb547 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 24 Jan 2022 18:14:28 +0900
Subject: [PATCH] errno.c: hide internal `_sys_fail` from backtrace.

---
 mrbgems/mruby-errno/src/errno.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mrbgems/mruby-errno/src/errno.c b/mrbgems/mruby-errno/src/errno.c
index 3617efd45..e6f91d211 100644
--- a/mrbgems/mruby-errno/src/errno.c
+++ b/mrbgems/mruby-errno/src/errno.c
@@ -92,6 +92,7 @@ mrb_sce_sys_fail(mrb_state *mrb, mrb_value cls)
   int argc;
   char name[8];
 
+  mrb->c->ci->mid = 0;
   sce = mrb_class_get(mrb, "SystemCallError");
   argc = mrb_get_args(mrb, "i|S", &no, &msg);
   if (argc == 1) {