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Add comments on Polarity

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Santiago Pastorino 2022-03-17 11:10:19 -03:00
parent c3797dcce6
commit 78346489c6
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7
compiler/rustc_middle/src/ty/mod.rs
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@ -748,6 +748,13 @@ pub struct TraitPredicate<'tcx> {
pub constness: BoundConstness,
/// If polarity is Positive: we are proving that the trait is implemented.
///
/// If polarity is Negative: we are proving that a negative impl of this trait
/// exists. (Note that coherence also checks whether negative impls of supertraits
/// exist via a series of predicates.)
///
/// If polarity is Reserved: that's a bug.
pub polarity: ImplPolarity,
}