From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2025-12-08T22:21:40+00:00
Subject: [ruby-core:124059] [Ruby Bug#21265] Crash when proc from Symbol#to_proc called outside refinement scope

Issue #21265 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.2: DONTNEED, 3.3: DONTNEED, 3.4: REQUIRED to 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONE

ruby_3_4 commit:ef2d4bf51bf28cfc427388a19e4a5fe9bbbe7a7a merged revision(s) commit:6e6f5d3c32a709c891ac6aa7833376907a6c81b5.

----------------------------------------
Bug #21265: Crash when proc from Symbol#to_proc called outside refinement scope
https://bugs.ruby-lang.org/issues/21265#change-115494

* Author: alanwu (Alan Wu)
* Status: Closed
* ruby -v: ruby 3.4.2 and trunk
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONE
----------------------------------------
```ruby
class RefinedScope
  using(Module.new { refine(Kernel) { def itself = 0 } })
  ITSELF = :itself.to_proc
end

RefinedScope::ITSELF[0]
```

```
../vm_method.c:1371: Assertion Failed: prepare_callable_method_entry:RB_TYPE_2_P(defined_class, RUBY_T_ICLASS, RUBY_T_MODULE): defined_class: T_FALSE
```

Or SEGV without `-DRUBY_DEBUG`.



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