From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2023-02-04T22:15:59+00:00
Subject: [ruby-core:112217] [Ruby master Bug#19413] Can't move object when 2 ivars refer to same object

Issue #19413 has been reported by luke-gru (Luke Gruber).

----------------------------------------
Bug #19413: Can't move object when 2 ivars refer to same object
https://bugs.ruby-lang.org/issues/19413

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
```ruby
class A
  def initialize
    @a = Object.new
    @b = @a
  end
end

r = Ractor.new do |err|
  obj = receive
  p obj
end
r.send(A.new, move: true) # Allocator undefined for Ractor::MovedObject
r.take
```

To fix it we could have a hash of old to new objects during traversal/replacement and use the same new object over again if necessary.



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