From: nagachika00@...
Date: 2020-07-23T04:51:09+00:00
Subject: [ruby-core:99288] [Ruby master Bug#16826] ObjectSpace::WeakMap#key? returns false if value is nil

Issue #16826 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: REQUIRED to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONE

ruby_2_7 9da6470d7b3aa136b4b92469c8bbc522beb1ac31 merged revision(s) a2be428c5fec31b8adbd5ac087e7637ddf7e54d0.

----------------------------------------
Bug #16826: ObjectSpace::WeakMap#key? returns false if value is nil
https://bugs.ruby-lang.org/issues/16826#change-86677

* Author: Eregon (Benoit Daloze)
* Status: Closed
* Priority: Normal
* Assignee: Eregon (Benoit Daloze)
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONE
----------------------------------------
```
$ ruby -e 'map=ObjectSpace::WeakMap.new; map[:foo] = 4; p map; p map.key? :foo'  
#<ObjectSpace::WeakMap:0x000055fbe0c38c00: :foo => 4>
true # OK

$ ruby -e 'map=ObjectSpace::WeakMap.new; map[:foo] = nil; p map; p map.key? :foo'
#<ObjectSpace::WeakMap:0x000056371e3f86e8: :foo => nil>
false # BUG
```



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