From 1136985cc06fe0f261eb2fd1abd12cf983f5dd59 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 2 Jan 2022 15:15:52 +0900
Subject: [PATCH] [ruby/etc] Note for rb_deprecate_constant [ci skip]

https://github.com/ruby/etc/commit/f87fe7ad93
---
 ext/etc/extconf.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ext/etc/extconf.rb b/ext/etc/extconf.rb
index 6e7810a5e8..159b1614b7 100644
--- a/ext/etc/extconf.rb
+++ b/ext/etc/extconf.rb
@@ -47,6 +47,7 @@ if !File.exist?("#{srcdir}/depend")
   %x[#{RbConfig.ruby} #{srcdir}/mkconstants.rb -o #{srcdir}/constdefs.h]
 end
 
+# TODO: remove when dropping 2.7 support, as exported since 3.0
 have_func('rb_deprecate_constant(Qnil, "None")')
 
 $distcleanfiles << "constdefs.h"