[burntsushi]

I'm on libs-api and I'd personally be on board with something like `thiserror` coming into `std`. But it would need a champion I think.

[epage]

I think we should provide the building blocks (display, etc like derive_more) rather than a specialized version one for errors (thiserror).

I also feel thiserror encourages a public error enum which to me is an anti-pattern as they are usually tied to your implementation and hard to add context, especially if you have a variants for other error types.

[the8472]

I don't quite understand the issue about public error enums? Distinguishing variants is very useful if some causes are recoverable or - when writing webservers - could be translated into different status codes. Often both are useful, something representing internal details for logging and a public interface.

[burntsushi]

Yeah I used the weasel-y "something like" for exactly these reasons. :-)