https://git.ruby-lang.org/ruby.git/commit/?id=1035a3b202

From 1035a3b202ee86bf2b0a1d00eefcfff0d7ab9f6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Wed, 22 Jul 2020 11:30:05 +0900
Subject: RUBY_SHOW_COPYRIGHT_TO_DIE: flip the default

Commit 7aab062ef3772c7e8e50fc872a1647918c76dbba says:

> ruby_show_version() will no longer exits the process, if
> RUBY_SHOW_COPYRIGHT_TO_DIE is set to 0.  This will be the default in
> the future.

3.0 is a good timing for that "future".

diff --git a/include/ruby/backward.h b/include/ruby/backward.h
index d8ea12b..350a58e 100644
--- a/include/ruby/backward.h
+++ b/include/ruby/backward.h
@@ -63,12 +63,9 @@ DECLARE_DEPRECATED_INTERNAL_FEATURE(rb_generic_ivar_table); https://github.com/ruby/ruby/blob/trunk/include/ruby/backward.h#L63
 NORETURN(ERRORFUNC(("internal function"), VALUE rb_mod_const_missing(VALUE, VALUE)));
 
 /* from version.c */
-#ifndef RUBY_SHOW_COPYRIGHT_TO_DIE
-# define RUBY_SHOW_COPYRIGHT_TO_DIE 1
-#endif
-#if RUBY_SHOW_COPYRIGHT_TO_DIE
+#if defined(RUBY_SHOW_COPYRIGHT_TO_DIE) && !!(RUBY_SHOW_COPYRIGHT_TO_DIE+0)
 /* for source code backward compatibility */
-DEPRECATED(static inline int ruby_show_copyright_to_die(int));
+RBIMPL_ATTR_DEPRECATED(("since 2.4"))
 static inline int
 ruby_show_copyright_to_die(int exitcode)
 {
-- 
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