# File lib/multimethod/multimethod.rb, line 172
    def ambiguous_methods(scores)
      # Check for additional methods with the same score as
      # the first method.
      scores = scores.select{|x| x[0] == scores[0][0]}

      # Map to a list of signatures.
      scores.size > 1 ? scores.collect{|x| x[1].signature} : nil
    end