class Range
  # Extends the default Range#include? to support range comparisons.
  #  (1..5).include?(1..5) # => true
  #  (1..5).include?(2..3) # => true
  #  (1..5).include?(2..6) # => false
  #
  # The native Range#include? behavior is untouched.
  #  ('a'..'f').include?('c') # => true
  #  (5..9).include?(11) # => false
  def include_with_range?(value)
    if value.is_a?(::Range)
      # 1...10 includes 1..9 but it does not include 1..10.
      operator = exclude_end? && !value.exclude_end? ? :< : :<=
      include_without_range?(value.first) && value.last.send(operator, last)
    else
      include_without_range?(value)
    end
  end
  # TODO: change to Module#prepend as soon as the fix is backported to MRI 2.2:
  # https://bugs.ruby-lang.org/issues/10847
  alias_method :include_without_range?, :include?
  alias_method :include?, :include_with_range?
end