[ruby-core:126445] [Ruby Feature#22252] improve "defined with an un-shareable Proc in a different Ractor" error

19 Aug 2026

      Issue #22252 has been updated by ufuk (Ufuk Kayserilioglu).

Btw, if you make the block that you are passing to `define_method` shareable, then you can make that version work as well. The following version of the script will work properly:
```ruby
# typed: true

module A
  def hello
    puts "Hello"
  end

  define_method(:hi, &Ractor.shareable_proc do |*args, **kwargs|
    puts "hi"
  end)

  class_eval(<<~RUBY, __FILE__, __LINE__ + 1)
    def ahoy(*args, **kwargs)
      puts "ahoy"
    end
  RUBY
end

class B
  include A
end

b = B.new
b.hello
b.ahoy
b.hi

r = Ractor.new do
  b2 = B.new
  b2.hello
  b2.ahoy
  b2.hi
end
r.join
```

----------------------------------------
Feature #22252: improve "defined with an un-shareable Proc in a different Ractor" error
https://bugs.ruby-lang.org/issues/22252#change-118595

* Author: getajobmike (Mike Perham)
* Status: Open
----------------------------------------
Hi, I'm trying to make my Ruby more compatible with Ractors. I'm seeing this error message but in an API with many abstractions, it can be difficult to determine the Proc in question. Would it be possible to include the source_location of the Proc to help improve debugging?

---Files--------------------------------
rtest.rb (350 Bytes)

-- 
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