From a615885f1e87f4bfbc5398b060fd3a64d5de8c4a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 29 Aug 2021 16:47:26 +0900
Subject: Free previously used tables [Bug #18134]

---
 test/ruby/test_hash.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'test/ruby')

diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index ac0d1dfce3..f79879c20a 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1278,6 +1278,15 @@ class TestHash < Test::Unit::TestCase
     assert_raise(FrozenError) { h2.replace(42) }
   end
 
+  def test_replace_memory_leak
+    assert_no_memory_leak([], "#{<<-"begin;"}", "#{<<-'end;'}")
+    h = ("aa".."zz").each_with_index.to_h
+    10_000.times {h.dup}
+    begin;
+      500_000.times {h.dup.replace(h)}
+    end;
+  end
+
   def test_size2
     assert_equal(0, @cls[].size)
   end
-- 
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