[ruby-core:106115] [Ruby master Feature#12737] Module#defined_refinements

Issue #12737 has been updated by shugo (Shugo Maeda).


Considerations raised by Matz at the developers meeting on 2021-11-18:

1. Is the name **defined**_refinements appropriate?

    other proposals:
    * configured_refinements (by tenderlove)
    * refinements
        * consistent with Module#constants
    * contained_refinements

2. Should the return value be an Array instead of a Hash?

    pros:
    * consistent with Module.used_refinements

    cons:
    * A new API like Refinement#refined_class (or target_class) is needed to know the refined class.
    * `M.defined_refinements.find { |r| r.refined_class == Integer }` is longer than `M.defined_refinements[Integer]`.



----------------------------------------
Feature #12737: Module#defined_refinements
https://bugs.ruby-lang.org/issues/12737#change-94712

* Author: shugo (Shugo Maeda)
* Status: Assigned
* Priority: Normal
----------------------------------------
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 M.defined_refinements #=> {String => $M_String, Integer => $M_Integer}
```

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

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




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