# File lib/vcr/request_matcher.rb, line 18
    def match_attributes=(attributes)
      # Unfortunately, 1.9.2 doesn't give the same hash code
      # for two sets of the same elements unless they are ordered
      # the same, so we sort the attributes here.
      attributes = attributes.sort { |a, b| a.to_s <=> b.to_s }
      @match_attributes = set(attributes)
    end