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Assert goal is fully normalized during assemble

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This commit is contained in:
Michael Goulet 2023-01-19 15:32:20 +00:00
parent c9c8e294d2
commit aee75f25cb
1 changed files with 4 additions and 1 deletions
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5
compiler/rustc_trait_selection/src/solve/assembly.rs
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@ -79,7 +79,7 @@ pub(super) enum CandidateSource {
AliasBound(usize),
}
pub(super) trait GoalKind<'tcx>: TypeFoldable<'tcx> + Copy {
pub(super) trait GoalKind<'tcx>: TypeFoldable<'tcx> + Copy + Eq {
fn self_ty(self) -> Ty<'tcx>;
fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self;
@ -124,6 +124,8 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
&mut self,
goal: Goal<'tcx, G>,
) -> Vec<Candidate<'tcx>> {
debug_assert_eq!(goal, self.infcx.resolve_vars_if_possible(goal));
// HACK: `_: Trait` is ambiguous, because it may be satisfied via a builtin rule,
// object bound, alias bound, etc. We are unable to determine this until we can at
// least structually resolve the type one layer.
@ -179,6 +181,7 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
Ok((_, certainty)) => certainty,
Err(NoSolution) => return,
};
let normalized_ty = self.infcx.resolve_vars_if_possible(normalized_ty);
// NOTE: Alternatively we could call `evaluate_goal` here and only have a `Normalized` candidate.
// This doesn't work as long as we use `CandidateSource` in winnowing.