https://git.ruby-lang.org/ruby.git/commit/?id=167cff6a5d

From 167cff6a5d5241e2929392682cc3a68ece3b0caf Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 17 May 2021 08:49:53 +0900
Subject: NEWS.md: mention lib/objspace/trace.rb [Feature #17762]

---
 NEWS.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/NEWS.md b/NEWS.md
index a41cf0b..e5b251d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -140,6 +140,12 @@ Excluding feature bug fixes. https://github.com/ruby/ruby/blob/trunk/NEWS.md#L140
 
 ## Miscellaneous changes
 
+* lib/objspace/trace.rb is added, which is a tool for tracing the object
+  allocation. Just by requiring this file, tracing is started *immediately*.
+  Just by `Kernel#p`, you can investigate where an object was created.
+  Note that just requiring this file brings a large performance overhead.
+  This is only for debugging purpose. Do not use this in production.
+  [Feature #17762]
 
 [Bug #4443]: https://bugs.ruby-lang.org/issues/4443
 [Feature #12194]: https://bugs.ruby-lang.org/issues/12194
@@ -153,3 +159,4 @@ Excluding feature bug fixes. https://github.com/ruby/ruby/blob/trunk/NEWS.md#L159
 [Bug #17423]: https://bugs.ruby-lang.org/issues/17423
 [Feature #17479]: https://bugs.ruby-lang.org/issues/17479
 [Feature #17744]: https://bugs.ruby-lang.org/issues/17744
+[Feature #17762]: https://bugs.ruby-lang.org/issues/17762
-- 
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