Class IRB::ExtendCommand::Require < Nop

# File ../ruby/lib/irb/cmd/load.rb, line 29
      def execute(file_name)
#       return ruby_require(file_name) unless IRB.conf[:USE_LOADER]

        rex = Regexp.new("#{Regexp.quote(file_name)}(\.o|\.rb)?")
        return false if $".find{|f| f =~ rex}

        case file_name
        when /\.rb$/
          begin
            if irb_load(file_name)
              $".push file_name
              return true
            end
          rescue LoadError
          end
        when /\.(so|o|sl)$/
          return ruby_require(file_name)
        end

        begin
          irb_load(f = file_name + ".rb")
          $".push f
          return true
        rescue LoadError
          return ruby_require(file_name)
        end
      end