Issue #16904 has been updated by vo.x (Vit Ondruch).

Backport changed from 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN to 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: REQUIRED

This was fixed in master:

https://github.com/ruby/ruby/commit/a18e81d797135de6e143a600e4f4d2b00ab23bf9
https://github.com/ruby/ruby/commit/5aa5aad48aa3effce60de3559d9bd107bfc9a91d
https://github.com/ruby/ruby/commit/07dca5c02c95322a39833705d3acd87b3adb00ac
https://github.com/ruby/ruby/commit/f0f138aa5d5857fb435bfaef95201d530f6d35da
https://github.com/ruby/ruby/commit/b9d431a7b129635356d03bb0bbdb9b5060a35729

Closing this to trigger backport request.

----------------------------------------
Bug #16904: rubygems: psych: superclass mismatch for class Mark (TypeError)
https://bugs.ruby-lang.org/issues/16904#change-86307

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: REQUIRED
----------------------------------------
Is it possible to backport the following commits into Ruby?

Remove explicit `psych` activation
https://github.com/rubygems/rubygems/commit/1ccf0912a161d20e0c4a7b139fd76e8739a411ba

bundler: Remove explicit `psych` activation. 
https://github.com/rubygems/rubygems/commit/88478bb56945ffa9868491cacd0bc74d9d73c848

It causes the following kind of error when psych is installed as not default gem but regular gem. It's a Fedora Ruby specific case. **This is not the case of Ruby built from source normally.**


```
$ cat test.rb 
require 'psych'
Gem.load_yaml # <= The error happens.
```

```
$ ruby test.rb
/usr/lib64/gems/ruby/psych-3.1.0/psych.so: warning: already initialized constant Psych::Parser::ANY
...
/usr/share/gems/gems/psych-3.1.0/lib/psych/parser.rb:34:in `<class:Parser>': superclass mismatch for class Mark (TypeError)
```

It is possibly also related to https://github.com/ruby/psych/issues/386 .

Thank you.



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