elixir-lang/elixir — pull request #2286 by alco (2014-05-15 22:33:17+00:00)
Title: Optionparser strict

This is to continue discussion started in https://github.com/elixir-lang/elixir/issues/2262.

This is only a tentative implementation to test ideas. Here I stop on the first invalid option (whether it is undefined or has bad value).