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.
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.