[garrinm]

I played around a bit with SNAFU a couple of years ago, but I'm haven't worked deeply with the library so there might well be some features I'm not aware of.

I think SNAFU is more like a combination of anyhow and thiserror into a single crate, rather than Stack Error which leans more heavily into the "turnkey" error struct. Using the Whatever struct, you get some overlap with Stack Error features:

- Error message are co-located.

- Error type implement std::error::Error (suitable for library development).

- External errors can be wrapped and context can easily be added.

Where Stack Error differs:

- Error codes (and URIs) offer ability for runtime error handling without having to compare strings.

- Provides pseudo-stack by stacking messages.

Underlying this is an opinion I baked into Stack Error: error messages are for debugging, not for runtime error handling. Otherwise all your error strings effectively become part of your public interface since a downstream library can rely on them for error handling.