[ruby-core:118878] [Ruby master Bug#19374] Issue with Ractor.make_shareable with curried procs

Issue #19374 has been updated by reesericci (Reese Armstrong).


Hey y'all - 

I'm commenting here to say that this bug seems to be the only way I was able to pass a Proc to a Ractor even though it doesn't reference self - so wondering what the path is for that instead of exploiting this bug.

Thanks,

--reese

----------------------------------------
Bug #19374: Issue with Ractor.make_shareable with curried procs
https://bugs.ruby-lang.org/issues/19374#change-109451

* Author: luke-gru (Luke Gruber)
* Status: Assigned
* Assignee: ko1 (Koichi Sasada)
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
This works, but shouldn't:

```ruby
class Worker
  def start(&blk)
    blk = blk.curry # bug in ruby allows sharing of non-shareable proc
    Ractor.make_shareable(blk)
    @ractor = Ractor.new(blk) do |b|
      main = b.call
      p "from ractor: #{main}"
    end
  end

  def work
    @ractor.take
  end
end

worker = Worker.new
a = self # unshareable main object
p "from main: #{a}"
worker.start { a }

worker.work
```

The curried proc has a reference to the original proc and it's not checked for shareability.



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