[ruby-core:98466] [Ruby master Bug#16904] rubygems: psych: superclass mismatch for class Mark (TypeError)

Issue #16904 has been updated by nobu (Nobuyoshi Nakada).


After installing psych 3.1.0, no error found.
What's wrong in Fedora?

```sh
$ for ruby in ruby2.{2..7}; do $ruby -rpsych -e 'p [RUBY_VERSION, Gem.load_yaml, Psych::VERSION]'; done
["2.2.10", true, "3.1.0"]
["2.3.8", true, "3.1.0"]
["2.4.10", true, "3.1.0"]
["2.5.8", true, "3.1.0"]
["2.6.6", true, "3.1.0"]
["2.7.1", true, "3.1.0"]
```

----------------------------------------
Bug #16904: rubygems: psych: superclass mismatch for class Mark (TypeError)
https://bugs.ruby-lang.org/issues/16904#change-85741

* Author: jaruga (Jun Aruga)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
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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