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query_outlives_constraints_into_obligations

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This commit is contained in:
Bastian Kauschke 2020-06-17 10:46:52 +02:00
parent cd30894c2f
commit fb36c8bc80
1 changed files with 24 additions and 20 deletions
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44
src/librustc_infer/infer/canonical/query_response.rs
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@ -526,27 +526,31 @@ fn query_outlives_constraints_into_obligations<'a>(
) -> impl Iterator<Item = PredicateObligation<'tcx>> + 'a + Captures<'tcx> {
unsubstituted_region_constraints.iter().map(move |constraint| {
let constraint = substitute_value(self.tcx, result_subst, constraint);
let ty::OutlivesPredicate(k1, r2) = constraint.skip_binder(); // restored below
Obligation::new(
cause.clone(),
param_env,
match k1.unpack() {
GenericArgKind::Lifetime(r1) => ty::PredicateKind::RegionOutlives(
ty::Binder::bind(ty::OutlivesPredicate(r1, r2)),
)
.to_predicate(self.tcx),
GenericArgKind::Type(t1) => ty::PredicateKind::TypeOutlives(ty::Binder::bind(
ty::OutlivesPredicate(t1, r2),
))
.to_predicate(self.tcx),
GenericArgKind::Const(..) => {
// Consts cannot outlive one another, so we don't expect to
// ecounter this branch.
span_bug!(cause.span, "unexpected const outlives {:?}", constraint);
}
},
)
let to_predicate = |ty::OutlivesPredicate(k1, r2): ty::OutlivesPredicate<
GenericArg<'tcx>,
ty::Region<'tcx>,
>| match k1.unpack() {
GenericArgKind::Lifetime(r1) => self.tcx.intern_predicate_kint(
ty::PredicateKint::RegionOutlives(ty::OutlivesPredicate(r1, r2)),
),
GenericArgKind::Type(t1) => self.tcx.intern_predicate_kint(
ty::PredicateKint::TypeOutlives(ty::OutlivesPredicate(t1, r2)),
),
GenericArgKind::Const(..) => {
// Consts cannot outlive one another, so we don't expect to
// ecounter this branch.
span_bug!(cause.span, "unexpected const outlives {:?}", constraint);
}
};
let predicate = if let Some(constraint) = constraint.no_bound_vars() {
to_predicate(constraint).to_predicate(self.tcx)
} else {
ty::PredicateKint::ForAll(constraint.map_bound(to_predicate)).to_predicate(self.tcx)
};
Obligation::new(cause.clone(), param_env, predicate)
})
}