work-with_refinements.rb

require 'with_refinements'

module Ext
  refine Integer do
    def asdjflk
      "ujihisa #{self}"
    end
  end
end

class C
  using WithRefinements

  def x
    123
  end

  def f
    x = 234

    p x() #=> 123
    with_refinements(Ext) do
      p x().asdjflk #=> "ujihisa 123"
      p binding.local_variable_get(:x).asdjflk #=> "ujihisa 234"
    end
  end
end

puts '----------------------'
C.new.f