Hi, author here. Glad you've enjoyed the post! To answer your questions: As leshow pointed out, Rust uses the Result type to propagate errors. The way we'll in

Hi, author here. Glad you've enjoyed the post! To answer your questions: As leshow pointed out, Rust uses the Result type to propagate errors. The way we'll integrate this in parallel-stream is by adding `try_for_each`, `try_fold`, and `try_map` methods. These methods will short-circuit when an error is returned, and have counterparts in `std` and `async-std` already. One tricky part is to get cancellation right, but we already have a design for that, it's just a matter of implementing it now. `async-std` comes with support for the `log` crate built-in, which provides information when a new `Task` (lightweight thread) is spawned. `parallel-stream` doesn't perform any logs on top of that, but it probably should! I'll open an issue. Result sets can be generated through the `collect` method which calls the `FromParallelStream` trait. This can be implemented for various types, but common examples include: `Vec<T>`(generic array), `HashMap`, and `Result<Vec<T>>`. If you're interested in how this exactly works this post by jcoglan goes into incredible detail: https://blog.jcoglan.com/2019/04/22/generic-returns-in-rust https://blog.jcoglan.com/2019/04/22/generic-returns-in-rust I hope this answers your questions!