# File lib/cucumber/step_mother.rb, line 43
    def initialize(step_def_1, step_def_2)
      message = "Multiple step definitions have the same Regexp:\n\n"
      message << step_def_1.backtrace_line << "\n"
      message << step_def_2.backtrace_line << "\n\n"
      super(message)
    end