https://git.ruby-lang.org/ruby.git/commit/?id=3db7f6353f

From 3db7f6353fd3b047b1fa9ea5d88a9bce36e8d46d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 6 Jul 2021 00:09:05 +0900
Subject: Suppress unused-but-set-variable warning

---
 ruby.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ruby.c b/ruby.c
index d192bad..a845a81 100644
--- a/ruby.c
+++ b/ruby.c
@@ -934,6 +934,8 @@ feature_option(const char *str, int len, void *arg, const unsigned int enable) https://github.com/ruby/ruby/blob/trunk/ruby.c#L934
 	rb_exc_raise(rb_exc_new_str(rb_eRuntimeError, mesg));
 #undef ADD_FEATURE_NAME
     }
+#else
+    (void)set;
 #endif
     rb_warn("unknown argument for --%s: `%.*s'",
 	    enable ? "enable" : "disable", len, str);
-- 
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