[ruby-core:89687] [Ruby trunk Bug#15278] Refinements don't work well with Forwardable

Issue #15278 has been reported by chucke (Tiago Cardoso).

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Bug #15278: Refinements don't work well with Forwardable
https://bugs.ruby-lang.org/issues/15278

* Author: chucke (Tiago Cardoso)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.1
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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Refined methods become unreachable when called through def_delegator.

```ruby
require "forwardable"

module URIExtensions
  refine URI::Generic do
    def authority
      port_string = port == default_port ? nil : ":#{port}"
      "#{host}#{port_string}"
    end

    def origin
      "#{scheme}://#{authority}"
    end
  end
end

using URIExtensions

class Container
  extend Forwardable
  def_delegator :@uri, :origin
  def_delegator :@uri, :authority

  def initialize(uri)
    @uri = uri
  end
end


u = URI("https://google.com")
container = Container.new(u)
puts container.origin
puts container.authority
```



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