[Manishearth]

Yes, because it is a Result, the caller cannot access the success value without acknowledging the existence of an error -- via match , unwrap, or try.

If the caller does not want to use the success value (esp. in cases which return Result<(),E>, i.e. return an optional error), there is a lint which tries to ensure that the error value is handled, though as steve says you can circumvent it (which is done in an explicit way so that it's pretty obvious that there is an error being ignored).