https://git.ruby-lang.org/ruby.git/commit/?id=e42c8c160d

From e42c8c160d17e302f56fdc4af4d54043ed2499df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 28 Sep 2021 10:49:07 +0900
Subject: add undeclared variables

Why did they even exist?
---
 string.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/string.c b/string.c
index 78e2ba923f..953716a1ed 100644
--- a/string.c
+++ b/string.c
@@ -6897,6 +6897,7 @@ upcase_single(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6897
 
     while (s < send) {
         unsigned int c = *(unsigned char*)s;
+        const rb_encoding *const enc = 0;
 
         if (rb_enc_isascii(c, enc) && 'a' <= c && c <= 'z') {
             *s = 'A' + (c - 'a');
@@ -6987,6 +6988,7 @@ downcase_single(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L6988
 
     while (s < send) {
         unsigned int c = *(unsigned char*)s;
+        const rb_encoding *const enc = 0;
 
         if (rb_enc_isascii(c, enc) && 'A' <= c && c <= 'Z') {
             *s = 'a' + (c - 'A');
-- 
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