mozilla/rust — pull request #8440 by sfackler (2013-08-10 18:11:53+00:00)
Title: Fixed option_env! type

The type of the result of option_env! was not fully specified in the
None case, leading to type check failures in the case where the variable
was not defined (e.g. option_env!("FOO").is_none()).

Also cleaned up some compilation warnings.