https://git.ruby-lang.org/ruby.git/commit/?id=4318aba9c9

From 4318aba9c94ebff53e4168886e1a35a24013924f Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Fri, 14 Aug 2020 08:51:14 +0900
Subject: re.c: prevent "warning: variable 'n' set but not used"

by adding MAYBE_UNUSED.

diff --git a/re.c b/re.c
index d776690..63cfc02 100644
--- a/re.c
+++ b/re.c
@@ -3519,7 +3519,7 @@ rb_reg_quote(VALUE str) https://github.com/ruby/ruby/blob/trunk/re.c#L3519
     t = RSTRING_PTR(tmp);
     /* copy upto metacharacter */
     const char *p;
-    long n;
+    long MAYBE_UNUSED(n);
     RSTRING_GETMEM(str, p, n);
     memcpy(t, p, s - p);
     t += s - p;
-- 
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