https://git.ruby-lang.org/ruby.git/commit/?id=2419b3dba6

From 2419b3dba6d86ea40a148f7547ff87b2074ca582 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 10 Dec 2019 10:44:21 +0900
Subject: [ruby/io-console] Suppress an unused-variable warning

https://github.com/ruby/io-console/commit/ae5c72e481

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index b83fb67..7a8ab8a 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -190,6 +190,7 @@ set_rawmode(conmode *t, void *arg) https://github.com/ruby/ruby/blob/trunk/ext/io/console/console.c#L190
 	    t->c_lflag |= ISIG|IEXTEN;
 	}
 #endif
+	(void)r;
     }
 }
 
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