From: "joker1007 (Tomohiro Hashidate) via ruby-core" <ruby-core@...>
Date: 2026-06-02T14:59:42+00:00
Subject: [ruby-core:125609] [Ruby Bug#22090] Enabling Ruby::Box breaks Marshal.load.

Issue #22090 has been reported by joker1007 (Tomohiro Hashidate).

----------------------------------------
Bug #22090: Enabling Ruby::Box breaks Marshal.load.
https://bugs.ruby-lang.org/issues/22090

* Author: joker1007 (Tomohiro Hashidate)
* Status: Open
* ruby -v: ruby 4.1.0dev (2026-05-31T10:35:05Z master 12c8599ffa) +PRISM [x86_64-linux]
* Backport: 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN
----------------------------------------
This is very simple.

``` ruby
class Foo
end

f = Marshal.dump(Foo.new)
Marshal.load(f)
```

# No Ruby::Box

This code returns `#<Foo:0x00007fdb9c744da0>`.

---

# Ruby::Box enabled

This code returns "undefined class/module Foo".

```
marshal_main.rb:5:in 'Marshal.load': undefined class/module Foo (ArgumentError)

p Marshal.load(f)
               ^
        from marshal_main.rb:5:in '<main>'
```



-- 
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