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5233bc91da
This makes it more like `hir::TyKind::Err`, and avoids a `span_delayed_bug` call in `LoweringContext::lower_ty_direct`. It also requires adding `ast::TyKind::Dummy`, now that `ast::TyKind::Err` can't be used for that purpose in the absence of an error emission. There are a couple of cases that aren't as neat as I would have liked, marked with `FIXME` comments.