[ruby-core:121978] [Ruby Bug#21321] Namespaces do not support extending mixins

10 May 2025


      Issue #21321 has been updated by byroot (Jean Boussier).
...
and sorry for the noise.
It's alright, even if the feature is experimental, the sooner bugs are noticed the better. So thank you for experimenting.

----------------------------------------
Bug #21321: Namespaces do not support extending mixins
https://bugs.ruby-lang.org/issues/21321#change-113094

* Author: fxn (Xavier Noria)
* Status: Closed
* 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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