[ruby-core:105699] [Ruby master Bug#17146] Queue operations are allowed after it is frozen

["Eregon (Benoit Daloze)" <noreply@ruby-lang.org>]

Issue #17146 has been updated by Eregon (Benoit Daloze).


OK, that `no benefit to changing the behavior.` was not reported here but I guess it's in the dev meeting log.

Benefit is consistency and being able to design deep freezing/immutable without making an exception for Queue.
Every time deep freezing/immutable comes up, this comes up as well as a problem.

I argue the current behavior is useful to nobody, and it's highly inconsistent, i.e., let's fix it.

----------------------------------------
Bug #17146: Queue operations are allowed after it is frozen
https://bugs.ruby-lang.org/issues/17146#change-94198

* 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.



-- 
https://bugs.ruby-lang.org/