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Rollup merge of #112772 - compiler-errors:clauses-1, r=lcnr

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Add a fully fledged `Clause` type, rename old `Clause` to `ClauseKind`

Does two basic things before I put up a more delicate set of PRs (along the lines of #112714, but hopefully much cleaner) that migrate existing usages of `ty::Predicate` to `ty::Clause` (`predicates_of`/`item_bounds`/`ParamEnv::caller_bounds`).

1. Rename `Clause` to `ClauseKind`, so it's parallel with `PredicateKind`.
2. Add a new `Clause` type which is parallel to `Predicate`.
    * This type exposes `Clause::kind(self) -> Binder<'tcx, ClauseKind<'tcx>>` which is parallel to `Predicate::kind` 😸

The new `Clause` type essentially acts as a newtype wrapper around `Predicate` that asserts that it is specifically a `PredicateKind::Clause`. Turns out from experimentation[^1] that this is not negative performance-wise, which is wonderful, since this a much simpler design than something that requires encoding the discriminant into the alignment bits of a predicate kind, or something else like that...

r? ``@lcnr`` or ``@oli-obk``

[^1]: https://github.com/rust-lang/rust/pull/112714#issuecomment-1595653910
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Nilstrieb 2023-06-21 07:37:01 +02:00 • committed by GitHub
commit a98c14f3a9
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2
compiler/rustc_mir_transform/src/generator.rs
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@ -1824,7 +1824,7 @@ fn check_must_not_suspend_ty<'tcx>(
let mut has_emitted = false;
for &(predicate, _) in tcx.explicit_item_bounds(def).skip_binder() {
// We only look at the `DefId`, so it is safe to skip the binder here.
if let ty::PredicateKind::Clause(ty::Clause::Trait(ref poly_trait_predicate)) =
if let ty::PredicateKind::Clause(ty::ClauseKind::Trait(ref poly_trait_predicate)) =
predicate.kind().skip_binder()
{
let def_id = poly_trait_predicate.trait_ref.def_id;