Comment by jrimbault

Just to point out for other readers, nowadays to make a custom error type you just need :

- an enum (or struct)

- its Display implementation

- its Error implementation, now just one function

And a few `impl From<OtherError> for MyError` to make the try? operator work.

For a library it's really not that much work. And even that can be simplified further to a few derive macros with another library : thiserror.