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Rollup merge of #95039 - spastorino:overlap-super-predicates, r=nikomatsakis

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Make negative coherence work when there's impl negative on super predicates

r? `@nikomatsakis`
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Matthias Krüger 2022-03-18 05:21:55 +01:00 • committed by GitHub
commit 588d389dc5
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6 changed files with 96 additions and 44 deletions
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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,
}