From: mame@...
Date: 2019-12-26T02:43:04+00:00
Subject: [ruby-core:96482] [Ruby master Feature#16377] Regexp literals	should be frozen

Issue #16377 has been updated by mame (Yusuke Endoh).

Assignee set to mame (Yusuke Endoh)

At the previous dev meeting, matz said that let's give it a try :-)

For the record: `Regexp.new` should continue to return unfrozen Regexp instance.

I'll review the pull request.

----------------------------------------
Feature #16377: Regexp literals should be frozen
https://bugs.ruby-lang.org/issues/16377#change-83411

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: mame (Yusuke Endoh)
* Target version: 2.8
----------------------------------------
The following script:

```ruby
def mutate
  re = /foo/
  state = re.instance_variable_get(:@state)
  re.instance_variable_set(:@state, state.to_i + 1)
  state
end

3.times do
  p mutate
end
```

Output this:

```
nil
1
2
```

IMHO, you shouldn't be able to mutate an unduplicated literal.

GitHub pull request: https://github.com/ruby/ruby/pull/2705



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