[ruby-core:112005] [Ruby master Bug#19374] Issue with Ractor.make_shareable with curried procs

["luke-gru (Luke Gruber) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #19374 has been reported by luke-gru (Luke Gruber).

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

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* 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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