[ruby-core:108660] [Ruby master Bug#18799] Refinement#import_methods vs attr_reader

Issue #18799 has been reported by palkan (Vladimir Dementyev).

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Bug #18799: Refinement#import_methods vs attr_reader
https://bugs.ruby-lang.org/issues/18799

* Author: palkan (Vladimir Dementyev)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-darwin21]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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Currently, it's not possible to import methods defined as attr_{reader, accessor,writer}:

```ruby
module M
  attr_reader :fuu
end

module R
  refine Object do
    import_methods M
  end
end

#=> Can't import method which is not defined with Ruby code: M#fuu (ArgumentError)
```

Is that a known/intentional limitation or a bug? From the error message it might seem that this is a bug (since `attr_smth` is a Ruby code).





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