Comment by swiftcoder
11 hours ago
> Rust has three main error systems (io::Error, thiserror, and anyhow), which is a pain when you have to pass them upward through a chain of calls
anyhow explicitly isn't designed for what you are trying to do here. It's designed to be the last link in the chain (and complementary to thiserror, not in competition). If you are using anyhow any deeper than your top-level binary crate, you are likely to be in for an unpleasant time.
also thiserror isn't incompatible with io::Error? all thiserror does is do code generation for "typical" enum errors. The errors it generates are normal rust code though, and the fact that they're generated by thiserror shouldn't really matter?
He was talking about the chain of function calls not crates. You still have that in your top level crate.