From f788ff35567206dad1d29117bb3b163e4ac6da92 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Fri, 15 Dec 2023 11:21:39 +0900
Subject: [PATCH] add a test

proposed at https://bugs.ruby-lang.org/issues/20050#note-5
---
 test/ruby/test_hash.rb | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 639707d8eb66a4..455521105e2ba4 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -2303,4 +2303,26 @@ def test_compare_by_identity_during_iteration
       end
     end
   end
+
+  def test_ar_hash_to_st_hash
+    assert_normal_exit("#{<<~"begin;"}\n#{<<~'end;'}", 'https://bugs.ruby-lang.org/issues/20050#note-5')
+    begin;
+      srand(0)
+      class Foo
+        def to_a
+          []
+        end
+
+        def hash
+          $h.delete($h.keys.sample) if rand < 0.1
+          to_a.hash
+        end
+      end
+
+      1000.times do
+        $h = {}
+        (0..10).each {|i| $h[Foo.new] ||= {} }
+      end
+    end;
+  end
 end