Behold, the null enumerator.

nullenum.rb

e = loop

e                               # => #<Enumerator: main:loop>

e.next                          # => nil
e.next                          # => nil
e.peek                          # => nil
e.size                          # => Infinity
e.rewind
e.next                          # => nil

Interestingly, @Peeja, at least next_values agrees with you:

e.next_values                   # => []

@Peeja

[5].cycle

Nice.

@AaronLasseigne Ooh, very nice.

@avdi That's interesting. It's a shame #with_object doesn't use use #next_values. I wonder if Ruby would accept a patch for it…