new

# File lib/irb/workspace.rb, line 16
    def initialize(*main)
      if main[0].kind_of?(Binding)
        @binding = main.shift
      elsif IRB.conf[:SINGLE_IRB]
        @binding = TOPLEVEL_BINDING
      else
        case IRB.conf[:CONTEXT_MODE]
        when 0 # binding in proc on TOPLEVEL_BINDING
          @binding = eval("proc{binding}.call",
                      TOPLEVEL_BINDING, 
                      __FILE__,
                      __LINE__)
        when 1 # binding in loaded file
          require "tempfile"
          f = Tempfile.open("irb-binding")
          f.print "          $binding = binding\n"
          f.close
          load f.path
          @binding = $binding

        when 2 # binding in loaded file(thread use)
          unless defined? BINDING_QUEUE
            require "thread"
            
            IRB.const_set("BINDING_QUEUE", SizedQueue.new(1))
            Thread.abort_on_exception = true
            Thread.start do
              eval "require \"irb/ws-for-case-2\"", TOPLEVEL_BINDING, __FILE__, __LINE__
            end
            Thread.pass
          end
          @binding = BINDING_QUEUE.pop

        when 3 # binging in function on TOPLEVEL_BINDING(default)
          @binding = eval("def irb_binding; binding; end; irb_binding",
                      TOPLEVEL_BINDING, 
                      __FILE__,
                      __LINE__ - 3)
        end
      end
      if main.empty?
        @main = eval("self", @binding)
      else
        @main = main[0]
        IRB.conf[:__MAIN__] = @main
        case @main
        when Module
          @binding = eval("IRB.conf[:__MAIN__].module_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
        else
          begin 
            @binding = eval("IRB.conf[:__MAIN__].instance_eval('binding', __FILE__, __LINE__)", @binding, __FILE__, __LINE__)
          rescue TypeError
            IRB.fail CantChangeBinding, @main.inspect
          end
        end
      end
      eval("_=nil", @binding)
    end