晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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# frozen_string_literal: false
#
#   irb/ext/cb.rb -
#   	$Release Version: 0.9.6$
#   	$Revision$
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#

module IRB # :nodoc:
  class Context

    # Inherited from +TOPLEVEL_BINDING+.
    def home_workspace
      if defined? @home_workspace
        @home_workspace
      else
        @home_workspace = @workspace
      end
    end

    # Changes the current workspace to given object or binding.
    #
    # If the optional argument is omitted, the workspace will be
    # #home_workspace which is inherited from +TOPLEVEL_BINDING+ or the main
    # object, <code>IRB.conf[:MAIN_CONTEXT]</code> when irb was initialized.
    #
    # See IRB::WorkSpace.new for more information.
    def change_workspace(*_main)
      if _main.empty?
        @workspace = home_workspace
        return main
      end

      @workspace = WorkSpace.new(_main[0])

      if !(class<<main;ancestors;end).include?(ExtendCommandBundle)
        main.extend ExtendCommandBundle
      end
    end
  end
end