? definitely works in closures, but it often takes a little finagling to get working, like specifying the return type of the closure or setting the return type of a collect to a Result<Vec<_>>
Mapping a Vec<T> to Result<U, E> and collecting them into a single Result<Vec<U>, E> made me feel like a ninja when I first learned it was supported. I’m a little worried it’s too confusing to read for others, but it works so well.
Combined with futures::try_join_all for async closures and you can use it to do a bunch of failable tasks in parallel too, it’s great.
Combined with futures::try_join_all for async closures and you can use it to do a bunch of failable tasks in parallel too, it’s great.