[ruby-core:121961] [Ruby Bug#21321] Namespaces do not support extending mixins

Issue #21321 has been updated by mame (Yusuke Endoh).


I don't think it's really necessary to create a separate ticket for this from #21319, is it?

----------------------------------------
Bug #21321: Namespaces do not support extending mixins
https://bugs.ruby-lang.org/issues/21321#change-113077

* Author: fxn (Xavier Noria)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
The program

```ruby
module M
end

class C
  extend M
end
```

fails under a namespace with error:

```
'Kernel#extend': Cannot extend object with refinement (TypeError)
```



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