From: "ko1 (Koichi Sasada) via ruby-core" <ruby-core@...>
Date: 2025-02-26T20:22:15+00:00
Subject: [ruby-core:121183] [Ruby master Bug#21159] `Module#set_temporary_name` should freeze given name

Issue #21159 has been reported by ko1 (Koichi Sasada).

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Bug #21159: `Module#set_temporary_name` should freeze given name
https://bugs.ruby-lang.org/issues/21159

* Author: ko1 (Koichi Sasada)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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I think it is preferable to freeze the name. 
So `#set_temporary_name` should copy and freeze the name string.

```ruby
c = Class.new.set_temporary_name(str = +'<c>')
p c          #=> <c>
str.upcase!
p c          #=> actual: <C>
             #=> expected: <c>
p c.name.frozen?
             #=> actual: false
             #=> expected: true
```

>From the Ractor's aspect, shareable modules should refer only immutable string.



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