elixir-lang/elixir — pull request #2664 by hamiltop (2014-08-10 18:30:07+00:00)
Title: Add Stream.interval/1 and Stream.timer/1

Per discussion on https://groups.google.com/forum/#!topic/elixir-lang-core/lhvytBduo3Q

Tests here are interesting. Anything time based is always a pain to test. Open to suggestions.