From 9cc6d399560f8db781ff654bca88884a6cdcde6f Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 14 Apr 2025 22:08:50 +0900
Subject: [PATCH] test/module.rb: add test for #6506

---
 test/t/module.rb | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/test/t/module.rb b/test/t/module.rb
index 1cfef87a3..7ec723a2d 100644
--- a/test/t/module.rb
+++ b/test/t/module.rb
@@ -889,3 +889,23 @@ assert('shared empty iv_tbl (prepend)') do
   m2::CONST2 = 2
   assert_equal 2, c::CONST2
 end
+
+assert('constant lookup #6506') do
+  Module.new do
+    module X
+      module A
+        class WWW; end
+      end
+    end
+
+    module X::Y; end
+
+    module X::Y::Z
+      extend X::A
+
+      class << self
+        assert_nothing_raised{WWW}
+      end
+    end
+  end
+end