[ruby-core:106513] [Ruby master Bug#18385] Refinement#import_methods(Enumerable) doesn't work

Issue #18385 has been updated by Eregon (Benoit Daloze).


zverok (Victor Shepelev) wrote in #note-2:
> I didn't realize that `import_methods` is a make-believe feature, not really integrated with the interpreter/object model. 

Not sure what you mean by that, in my POV it is integrated and it has the effect to "copy" methods from a module to another module or to a refinement, so that refinements can apply as if they were defined there lexically.

C extension-defined methods never supported refinements and likely never will (there is no lexical context for a call there).

----------------------------------------
Bug #18385: Refinement#import_methods(Enumerable) doesn't work
https://bugs.ruby-lang.org/issues/18385#change-95173

* Author: zverok (Victor Shepelev)
* Status: Closed
* Priority: Normal
* Assignee: shugo (Shugo Maeda)
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Very simple to reproduce:
```ruby
module M
  refine String do
    import_methods Enumerable
  end
end
```
Leads to: `import_methods': Can't import method: Enumerable#drop (ArgumentError)`
Which, grepping through code, seems to be raised [here](https://github.com/ruby/ruby/blob/master/eval.c#L1529) but I am not versed enough in Ruby internals to debug further.

An attempt to `import_methods Comparable` leads to the same problem, BTW: `Can't import method: Comparable#between?`

Am I missing something crucial about `import_method` behavior?



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