https://git.ruby-lang.org/ruby.git/commit/?id=acbc2bdd30

From acbc2bdd3030bef997919ce56c5b120cc5e91e8f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 17 Mar 2022 15:07:18 +0900
Subject: Update the test for [Feature #18615]

---
 test/mkmf/test_flags.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/mkmf/test_flags.rb b/test/mkmf/test_flags.rb
index a3596d8e55..b28ac5d672 100644
--- a/test/mkmf/test_flags.rb
+++ b/test/mkmf/test_flags.rb
@@ -25,7 +25,7 @@ class TestMkmf https://github.com/ruby/ruby/blob/trunk/test/mkmf/test_flags.rb#L25
       -Wextra -Wno-unused-parameter -Wno-parentheses
       -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith
       -Wwrite-strings -Wdeclaration-after-statement
-      -Wshorten-64-to-32 -Wimplicit-function-declaration
+      -Wshorten-64-to-32 -Werror-implicit-function-declaration
       ", generated_flags
 
     ensure
-- 
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