[ruby-core:101945] [Ruby master Bug#17513] Methods of shareable objects and UnboundMethods should be shareable

Issue #17513 has been reported by marcandre (Marc-Andre Lafortune).

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Bug #17513: Methods of shareable objects and UnboundMethods should be shareable
https://bugs.ruby-lang.org/issues/17513

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* ruby -v: 3.0.0p0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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```ruby
class Foo
  def foo
  end
end

f = Foo.new.freeze
Ractor.shareable?(f) # => true
Ractor.make_shareable(f.method(:foo).to_proc) # => Proc, ok
Ractor.make_shareable(f.method(:foo)) # => Ractor::Error, expected Method
Ractor.make_shareable(Foo.instance_method(:foo)) # => Ractor::Error, expected UnboundMethod
```




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