Adding context to an error comparable to anyhow

[nnmm]

It would be nice to be able to attach arbitrarily many context layers (strings) to an error like with anyhow. Then, the whole chain of errors can be displayed, making it easier to interpret the error, like so: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=e9f0165235983d8021bebf3081d9bd99

I think what error_set does with warn_context() etc. is not really comparable but something different, because the context is not stored inside of the error but immediately passed to a logging crate. For instance, if I'd like to display an error chain in a UI, not on the console, I'd need to set up a complicated tracing subscriber to extract exactly the right messages for that error - I'm not sure that is even possible.

Is this something that is worth considering? I'm guessing it would require adding an extra "Chained" variant to error enums that stores the original error and a context message.

[mcmah309]

Integration with eros may be what you are looking for.