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# File railties/lib/rails/rack/debugger.rb, line 4
      def initialize(app)
        @app = app

        ARGV.clear # clear ARGV so that script/server options aren't passed to IRB

        require_library_or_gem 'ruby-debug'
        ::Debugger.start
        ::Debugger.settings[:autoeval] = true if ::Debugger.respond_to?(:settings)
        puts "=> Debugger enabled"
      rescue Exception
        puts "You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'"
        exit
      end
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