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Document flip polarity

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Santiago Pastorino 2021-10-22 09:34:36 -03:00
parent 7829d9dde3
commit c4c76a4fbd
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3
compiler/rustc_infer/src/traits/mod.rs
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@ -56,6 +56,9 @@ pub type PredicateObligation<'tcx> = Obligation<'tcx, ty::Predicate<'tcx>>;
pub type TraitObligation<'tcx> = Obligation<'tcx, ty::PolyTraitPredicate<'tcx>>;
impl PredicateObligation<'tcx> {
/// Flips the polarity of the inner predicate.
///
/// Given `T: Trait` predicate it returns `T: !Trait` and given `T: !Trait` returns `T: Trait`.
pub fn flip_polarity(&self, tcx: TyCtxt<'tcx>) -> Option<PredicateObligation<'tcx>> {
Some(PredicateObligation {
cause: self.cause.clone(),