with_repl_friendly_inspect.rb

def with_repl_friendly_inspect(&block)
  x = block.call

  case x
  # We don't want to and sometimes can't override the #inspect method
  # of these classes of values.
  when Array,
       Class,
       FalseClass,
       Hash,
       Module,
       NilClass,
       Numeric,
       String,
       TrueClass
    x
  else
    x.instance_eval do
      def inspect
        "#<%s:0x00%x>" % [
          self.class.name,
          self.object_id << 1
        ]
      end
    end
  end

  x
end