https://git.ruby-lang.org/ruby.git/commit/?id=43e8d9a050

From 43e8d9a0509e1961c406fedb2c168a6ec2359fdc Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 19 Aug 2022 23:39:52 +0900
Subject: Check if encoding capable object before check if ASCII compatible

---
 string.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/string.c b/string.c
index 6f211b2005..cd4a593856 100644
--- a/string.c
+++ b/string.c
@@ -2526,6 +2526,9 @@ void https://github.com/ruby/ruby/blob/trunk/string.c#L2526
 rb_must_asciicompat(VALUE str)
 {
     rb_encoding *enc = rb_enc_get(str);
+    if (!enc) {
+        rb_raise(rb_eTypeError, "not encoding capable object");
+    }
     if (!rb_enc_asciicompat(enc)) {
         rb_raise(rb_eEncCompatError, "ASCII incompatible encoding: %s", rb_enc_name(enc));
     }
-- 
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