[ruby-core:114147] [Ruby master Bug#19765] Ractor.make_shareable ignores self of a proc created from a Method

Issue #19765 has been reported by Ethan (Ethan -).

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Bug #19765: Ractor.make_shareable ignores self of a proc created from a Method
https://bugs.ruby-lang.org/issues/19765

* Author: Ethan (Ethan -)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.3.0dev (2023-07-12T00:26:03Z master dfe782be17) [x86_64-darwin21]
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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An unshareable receiver of a Proc or a Method will cause make_shareable to error, but this does not happen with a proc from Method#to_proc:

```ruby
str = ""

a = str.instance_exec { proc { to_s } }
Ractor.make_shareable a
# => <internal:ractor>:820:in `make_shareable': Proc's self is not shareable: #<Proc:0x00000001064b62c8 (irb):1> (Ractor::IsolationError)

b = str.instance_exec { method(:to_s) }
Ractor.make_shareable b
# => <internal:ractor>:820:in `make_shareable': can not make shareable object for #<Method: String#to_s()> (Ractor::Error)

c = str.instance_exec { method(:to_s).to_proc }
Ractor.make_shareable c

c.call
# => ""

str[0] = "!"
c.call
# => "!"
```

Related, maybe:
#19372
#19374

Tangential: why does Proc cause Ractor::IsolationError but Method causes Ractor::Error?



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