inspect_mode=

# File lib/irb/context.rb, line 193
    def inspect_mode=(opt)

      if i = INSPECTORS[opt]
        @inspect_mode = opt
        @inspect_method = i
        i.init
      else
        case opt
        when nil
          if INSPECTORS.keys_with_inspector(INSPECTORS[true]).include?(@inspect_mode)
            self.inspect_mode = false
          elsif INSPECTORS.keys_with_inspector(INSPECTORS[false]).include?(@inspect_mode)
            self.inspect_mode = true
          else
            puts "Can't switch inspect mode."
            return
          end
        when /^\s*\{.*\}\s*$/
          begin
            inspector = eval "proc#{opt}"
          rescue Exception
            puts "Can't switch inspect mode(#{opt})."
            return
          end
          self.inspect_mode = inspector
        when Proc
          self.inspect_mode = IRB::Inspector(opt)
        when Inspector
          prefix = "usr%d"
          i = 1
          while INSPECTORS[format(prefix, i)]; i += 1; end
          @inspect_mode = format(prefix, i)
          @inspect_method = opt
          INSPECTORS.def_inspector(format(prefix, i), @inspect_method)
        else
          puts "Can't switch inspect mode(#{opt})."
          return
        end
      end
      print "Switch to#{unless @inspect_mode; ' non';end} inspect mode.\n" if verbose?
      @inspect_mode
    end