https://git.ruby-lang.org/ruby.git/commit/?id=44368b5f8b

From 44368b5f8bc21e19fa06a0fc0625923fc41293e6 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Thu, 6 Jan 2022 13:32:59 -0500
Subject: Set encoding before concatenating to string

If we set encoding after the call to rb_str_buf_cat, then rb_str_buf_cat
will not set the correct terminator length.
---
 string.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/string.c b/string.c
index cdb8658d7f4..5b3c7cd57b6 100644
--- a/string.c
+++ b/string.c
@@ -3186,8 +3186,8 @@ rb_enc_cr_str_buf_cat(VALUE str, const char *ptr, long len, https://github.com/ruby/ruby/blob/trunk/string.c#L3186
             if (len == 0)
                 return str;
             if (RSTRING_LEN(str) == 0) {
-                rb_str_buf_cat(str, ptr, len);
                 ENCODING_CODERANGE_SET(str, ptr_encindex, ptr_cr);
+                rb_str_buf_cat(str, ptr, len);
                 return str;
             }
             goto incompatible;
-- 
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