Bug #19765: Ractor.make_shareable ignores self of a proc created from a Method

• Status: Closed
• Assignee: ractor
• Target version: 3.5
• 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

[Ethan (Ethan -)]

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:

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?

[mame (Yusuke Endoh)]

• Assignee set to ko1 (Koichi Sasada)

[hsbt (Hiroshi SHIBATA)]

• Status changed from Open to Assigned

[jhawthorn (John Hawthorn)]

• Status changed from Assigned to Closed
• Assignee changed from ko1 (Koichi Sasada) to ractor
• Target version set to 3.5

This should be fixed by git|d80f3a287c5c8d0404b6cb837db360cab320cde1

The third example now also raises can not make shareable object for #<Method: String#to_s()>