These impls are all needed for just a single `IntoDiagnostic` type, not a family of them. Note that `ErrorGuaranteed` is the default type parameter for `IntoDiagnostic`.
These impls are all needed for just a single `IntoDiagnostic` type, not a family of them. Note that `ErrorGuaranteed` is the default type parameter for `IntoDiagnostic`.