From: "hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@...>
Date: 2023-02-07T06:03:19+00:00
Subject: [ruby-core:112248] [Ruby master Bug#19409] Object's shape is reset after a ractor move

Issue #19409 has been updated by hsbt (Hiroshi SHIBATA).

Status changed from Open to Assigned
Assignee set to ko1 (Koichi Sasada)

----------------------------------------
Bug #19409: Object's shape is reset after a ractor move
https://bugs.ruby-lang.org/issues/19409#change-101675

* Author: luke-gru (Luke Gruber)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
I believe an object should have the same shape after being moved from 1 ractor to another.

```ruby
class Obj
  attr_accessor :a, :b, :c, :d
  def initialize
    @a = 1
    @b = 2
    @c = 3
  end
end
r = Ractor.new do
  obj = receive
  #p RubyVM::Shape.of(obj)
  obj.d = 4
  p obj.a, obj.b, obj.c, obj.d # gets wrong values due to object shape id being reset on object
end
obj = Obj.new
#p RubyVM::Shape.of(obj)
r.send(obj, move: true)
r.take
```



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