[ruby-core:121968] [Ruby Bug#21319] Namespaces do not support including mixins

Issue #21319 has been updated by fxn (Xavier Noria).


I was yesterday running a checkout from May 6. Updated the branch now and cannot repro anymore.

----------------------------------------
Bug #21319: Namespaces do not support including mixins
https://bugs.ruby-lang.org/issues/21319#change-113084

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

```ruby
module M
end

class C
  include M
end
```

fails under a namespace with error

```
'Module#include': Cannot include refinement (TypeError)
```



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