This is a bit annoying as we are forced to use #[related] here which isn't quite what we want.
Ideally, this would use #[diagnostic_source] but, there's a bug upstream. See: zkat/miette#172.
Far less verbose than defining classes by hand, plus, it allows to have everything about a single error be co-located. And finally, it allows to use 'related', 'label' and so on more easily.
KtorZ