From 522d4cd32f7727886f4fcbc28ed29c08d361ee20 Mon Sep 17 00:00:00 2001
From: Kenichi Kamiya <kachick1@gmail.com>
Date: Sun, 28 Mar 2021 14:09:52 +0900
Subject: [PATCH] Force recycle intermediate collection in Hash#transform_keys!
 [Bug #17735]

* Force recycle intermediate hash

* Force recycle intermediate array too

https://github.com/ruby/ruby/pull/4329#issuecomment-808840718
---
 hash.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hash.c b/hash.c
index 17864a0fcd..60fad036c2 100644
--- a/hash.c
+++ b/hash.c
@@ -3294,7 +3294,9 @@ rb_hash_transform_keys_bang(int argc, VALUE *argv, VALUE hash)
             rb_hash_aset(new_keys, new_key, Qnil);
         }
         rb_ary_clear(pairs);
+        rb_gc_force_recycle(pairs);
         rb_hash_clear(new_keys);
+        rb_gc_force_recycle(new_keys);
     }
     return hash;
 }