From 1a2f99275be28fb0e8ff4cfc0165966e99898d70 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Fri, 19 Aug 2022 23:53:33 +0900
Subject: [Bug #18958] format string must be ASCII compatible

---
 sprintf.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'sprintf.c')

diff --git a/sprintf.c b/sprintf.c
index f7ebe82e2c..22323265b3 100644
--- a/sprintf.c
+++ b/sprintf.c
@@ -250,6 +250,7 @@ rb_str_format(int argc, const VALUE *argv, VALUE fmt)
     --argv;
     StringValue(fmt);
     enc = rb_enc_get(fmt);
+    rb_must_asciicompat(fmt);
     orig = fmt;
     fmt = rb_str_tmp_frozen_acquire(fmt);
     p = RSTRING_PTR(fmt);
-- 
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