https://git.ruby-lang.org/ruby.git/commit/?id=0c6e24d102

From 0c6e24d102e894a7211a596e6aa95828b1cf4406 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@j...>
Date: Tue, 22 Feb 2022 13:43:14 -0800
Subject: Fix visibility of alias of zsuper methods

This was broken by 71c746379d5872e250d90ae45c585760afaf9516.

Fixes [Bug #18600]
---
 test/ruby/test_alias.rb | 10 ++++++++++
 vm_method.c             |  1 +
 2 files changed, 11 insertions(+)

diff --git a/test/ruby/test_alias.rb b/test/ruby/test_alias.rb
index 99f2223b49..0d33cb993c 100644
--- a/test/ruby/test_alias.rb
+++ b/test/ruby/test_alias.rb
@@ -265,6 +265,16 @@ class TestAlias < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_alias.rb#L265
     end;
   end
 
+  class C2
+    public :system
+    alias_method :bar, :system
+    alias_method :system, :bar
+  end
+
+  def test_zsuper_alias_visibility
+    assert(C2.new.respond_to?(:system))
+  end
+
   def test_alias_memory_leak
     assert_no_memory_leak([], "#{<<~"begin;"}", "#{<<~'end;'}", rss: true)
     begin;
diff --git a/vm_method.c b/vm_method.c
index edbaad2396..0400aab801 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -2146,6 +2146,7 @@ rb_alias(VALUE klass, ID alias_name, ID original_name) https://github.com/ruby/ruby/blob/trunk/vm_method.c#L2146
 	visi = METHOD_ENTRY_VISI(orig_me);
 	goto again;
       case VM_METHOD_TYPE_ALIAS:
+        visi = METHOD_ENTRY_VISI(orig_me);
         orig_me = orig_me->def->body.alias.original_me;
         VM_ASSERT(orig_me->def->type != VM_METHOD_TYPE_ALIAS);
         break;
-- 
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