[ruby-core:95977] [Ruby master Feature#16377] Regexp literals should be frozen

Issue #16377 has been reported by byroot (Jean Boussier).

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

* Author: byroot (Jean Boussier)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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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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