From: nagachika00@...
Date: 2021-05-23T07:10:06+00:00
Subject: [ruby-core:103998] [Ruby master Bug#17736] Destructive methods inconsistently handle `receiver frozen state` in given block

Issue #17736 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: REQUIRED to 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE

ruby_3_0 44b87adc07621b6a8eddfcf4aaff34ce634179d4 merged revision(s) e019dd24df4ed7063ad80d4c2e4070141793f598,7954bb056be30e86c419fe3792064d28990a4999,7d3fdfb27dac456827b004d9e66a44b15f8cd762.

----------------------------------------
Bug #17736: Destructive methods inconsistently handle `receiver frozen state` in given block
https://bugs.ruby-lang.org/issues/17736#change-92135

* Author: kachick (Kenichi Kamiya)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin20]
* Backport: 2.5: REQUIRED, 2.6: REQUIRED, 2.7: REQUIRED, 3.0: DONE
----------------------------------------
When I interested around https://bugs.ruby-lang.org/issues/17735, I found following behaviors.

```ruby
array = [1, 2, 3, 42]
array.select! do
  array.freeze
  false
end
p array #=> []
```

```ruby
array = [1, 2, 3, 42, 2, 3]
begin
  array.uniq! do |item|
    array.freeze
    item
  end
rescue => err
  p err #=> #<FrozenError: can't modify frozen Array: [1, 2, 3, 42, 2, 3]>
end

p array #=> [1, 2, 3, 42, 2, 3]
```

```ruby
hash = {a: 1, b: 2, c: 3}
hash.select! do
  hash.freeze
  false
end
p hash #=> {}
```

Is this an intentional behavior?
I would expect `To raise FrozenError` and `Does not modify receiver after frozen` like Array#uniq!.



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