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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
This commit is contained in:
Nilstrieb 2023-06-21 07:37:01 +02:00 • committed by GitHub
commit a98c14f3a9
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101 changed files with 725 additions and 608 deletions
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8
compiler/rustc_trait_selection/src/solve/assembly/mod.rs
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@ -106,7 +106,7 @@ pub(super) trait GoalKind<'tcx>:
fn probe_and_match_goal_against_assumption(
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
assumption: ty::Binder<'tcx, ty::Clause<'tcx>>,
assumption: ty::Clause<'tcx>,
then: impl FnOnce(&mut EvalCtxt<'_, 'tcx>) -> QueryResult<'tcx>,
) -> QueryResult<'tcx>;
@ -116,7 +116,7 @@ pub(super) trait GoalKind<'tcx>:
fn consider_implied_clause(
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
assumption: ty::Binder<'tcx, ty::Clause<'tcx>>,
assumption: ty::Clause<'tcx>,
requirements: impl IntoIterator<Item = Goal<'tcx, ty::Predicate<'tcx>>>,
) -> QueryResult<'tcx> {
Self::probe_and_match_goal_against_assumption(ecx, goal, assumption, |ecx| {
@ -132,7 +132,7 @@ pub(super) trait GoalKind<'tcx>:
fn consider_alias_bound_candidate(
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
assumption: ty::Binder<'tcx, ty::Clause<'tcx>>,
assumption: ty::Clause<'tcx>,
) -> QueryResult<'tcx> {
Self::probe_and_match_goal_against_assumption(ecx, goal, assumption, |ecx| {
ecx.validate_alias_bound_self_from_param_env(goal)
@ -145,7 +145,7 @@ pub(super) trait GoalKind<'tcx>:
fn consider_object_bound_candidate(
ecx: &mut EvalCtxt<'_, 'tcx>,
goal: Goal<'tcx, Self>,
assumption: ty::Binder<'tcx, ty::Clause<'tcx>>,
assumption: ty::Clause<'tcx>,
) -> QueryResult<'tcx> {
Self::probe_and_match_goal_against_assumption(ecx, goal, assumption, |ecx| {
let tcx = ecx.tcx();