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c1b28c3435
Don't ICE on `DiscriminantKind` projection in new solver As title says, since we now actually call `Ty::discriminant_kind` on placeholder types 😃 Also drive-by simplify `Pointee::Metadata` projection logic, and fix the UI test because the `<T as Pointee>::Metadata` tests weren't actually exercising the new projection logic, since we still eagerly normalize (which hits `project.rs` in the old solver) in HIR typeck. r? `@lcnr` tho feel free to re-roll, this pr is very low-priority and not super specific to the new trait solver. Fixes compiler-errors/next-solver-hir-issues#14