Fix perf issue for auto trait selection
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3fe3b89cd5
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3 changed files with 29 additions and 2 deletions
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@ -999,6 +999,15 @@ impl<'tcx> PolyTraitRef<'tcx> {
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polarity: ty::ImplPolarity::Positive,
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})
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}
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/// Same as [`PolyTraitRef::to_poly_trait_predicate`] but sets a negative polarity instead.
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pub fn to_poly_trait_predicate_negative_polarity(&self) -> ty::PolyTraitPredicate<'tcx> {
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self.map_bound(|trait_ref| ty::TraitPredicate {
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trait_ref,
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constness: ty::BoundConstness::NotConst,
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polarity: ty::ImplPolarity::Negative,
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})
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}
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}
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/// An existential reference to a trait, where `Self` is erased.
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