From: ko1@...
Date: 2020-09-04T00:58:59+00:00
Subject: [ruby-core:99908] [Ruby master Bug#17146] Queue operations are allowed after it is frozen

Issue #17146 has been updated by ko1 (Koichi Sasada).


> I guess old Thread::Queue implemented in Ruby did not have this bug.


`require "thread"; q=Queue.new.freeze; q.push 1` works without error from Ruby 1.6.0.
Surprisingly before 1.6.0 there is no `Queue#freeze`.

----------------------------------------
Bug #17146: Queue operations are allowed after it is frozen
https://bugs.ruby-lang.org/issues/17146#change-87439

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.6.6p146 (2020-03-31 revision 67876) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```
[1] pry(main)> q = Queue.new
=> #<Thread::Queue:0x000056263683aee8>
[2] pry(main)> q.freeze
=> #<Thread::Queue:0x000056263683aee8>
[3] pry(main)> q << 1
=> #<Thread::Queue:0x000056263683aee8>
[4] pry(main)> q.pop
=> 1
[5] pry(main)> q.frozen?
=> true
```

Found by @ko1 in https://bugs.ruby-lang.org/issues/17100#note-28

I think it's a bug, since those are clear mutations.
I guess old Thread::Queue implemented in Ruby did not have this bug.



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