From d3a2a3c5420fecfee54cbf3fbdd9287bc6c58f03 Mon Sep 17 00:00:00 2001
From: "NARUSE, Yui" <naruse@airemix.jp>
Date: Sun, 30 Jan 2022 19:02:23 +0900
Subject: merge revision(s) 9e0a91d0640600f2dfd7fc1d5fae6667019c9ca5: [Backport
 #18458]

	Don't segfault if Warning.warn is undefined

	Check that there is a method entry for the method before passing
	it to rb_method_entry_arity.

	Fixes [Bug #18458]
	---
	 error.c                     | 3 ++-
	 test/ruby/test_exception.rb | 8 ++++++++
	 2 files changed, 10 insertions(+), 1 deletion(-)
---
 test/ruby/test_exception.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'test')

diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index 67f38c2e91..c8746359fd 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -1200,6 +1200,14 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
     assert_empty warning
   end
 
+  def test_undef_Warning_warn
+    assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
+    begin;
+      Warning.undef_method(:warn)
+      assert_raise(NoMethodError) { warn "" }
+    end;
+  end
+
   def test_undefined_backtrace
     assert_separately([], "#{<<-"begin;"}\n#{<<-"end;"}")
     begin;
-- 
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