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lcnr 2023-07-18 18:18:32 +02:00
parent aa28b77b5a
commit 7c97a76b76
1 changed files with 6 additions and 0 deletions
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6
compiler/rustc_trait_selection/src/solve/assembly/mod.rs
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@ -324,6 +324,12 @@ impl<'tcx> EvalCtxt<'_, 'tcx> {
candidates candidates
} }
/// 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 structurally resolve the type one layer.
///
/// It would also require us to consider all impls of the trait, which is both pretty
/// bad for perf and would also constrain the self type if there is just a single impl.
fn self_ty_infer_ambiguity_hack<G: GoalKind<'tcx>>( fn self_ty_infer_ambiguity_hack<G: GoalKind<'tcx>>(
&mut self, &mut self,
goal: Goal<'tcx, G>, goal: Goal<'tcx, G>,