[ruby-core:77215] [Ruby trunk Feature#12737] Module#defined_refinements

Issue #12737 has been reported by Shugo Maeda.

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Feature #12737: Module#defined_refinements
https://bugs.ruby-lang.org/issues/12737

* Author: Shugo Maeda
* Status: Open
* Priority: Normal
* Assignee: 
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How about to provide Module#defined_refinements, which returns the refinements defined in the receiver as a Hash, as follows:

```
module M
  refine String do
    $M_String = self
  end

  refine Integer do
    $M_Integer = self
  end
end

p Module.defined_refinements #=> {String => $M_String, Integer => $M_Integer}
```

By `Module#defined_refinements`, you can activate refinements globally:

```
for klass, refinement in Module.defined_refinements
  klass.prepend(refinement)
end
```




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