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Consider negative polarity on overlap check

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Santiago Pastorino 2021-10-12 12:11:00 -03:00
parent 6975afd141
commit 8b0bfb0dcb
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GPG key ID: 8131A24E0C79EFAF
6 changed files with 46 additions and 19 deletions
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13
compiler/rustc_infer/src/traits/mod.rs
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@ -10,7 +10,7 @@ pub mod util;
use rustc_hir as hir;
use rustc_middle::ty::error::{ExpectedFound, TypeError};
use rustc_middle::ty::{self, Const, Ty};
use rustc_middle::ty::{self, Const, Ty, TyCtxt};
use rustc_span::Span;
pub use self::FulfillmentErrorCode::*;
@ -55,6 +55,17 @@ pub struct Obligation<'tcx, T> {
pub type PredicateObligation<'tcx> = Obligation<'tcx, ty::Predicate<'tcx>>;
pub type TraitObligation<'tcx> = Obligation<'tcx, ty::PolyTraitPredicate<'tcx>>;
impl PredicateObligation<'tcx> {
pub fn flip_polarity(&self, tcx: TyCtxt<'tcx>) -> Option<PredicateObligation<'tcx>> {
Some(PredicateObligation {
cause: self.cause.clone(),
param_env: self.param_env,
predicate: self.predicate.flip_polarity(tcx)?,
recursion_depth: self.recursion_depth,
})
}
}
// `PredicateObligation` is used a lot. Make sure it doesn't unintentionally get bigger.
#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
static_assert_size!(PredicateObligation<'_>, 32);