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//! Various code related to computing outlives relations.
pub mod components;
pub mod env;
pub mod obligations;
pub mod test_type_match;
pub mod verify;
use rustc_middle::traits::query::OutlivesBound;
use rustc_middle::ty;
#[instrument(level = "debug", skip(param_env))]
pub fn explicit_outlives_bounds<'tcx>(
param_env: ty::ParamEnv<'tcx>,
) -> impl Iterator<Item = OutlivesBound<'tcx>> + 'tcx {
param_env
.caller_bounds()
.into_iter()
.map(ty::Predicate::kind)
.filter_map(ty::Binder::no_bound_vars)
.filter_map(move |kind| match kind {
ty::PredicateKind::Projection(..)
| ty::PredicateKind::Trait(..)
| ty::PredicateKind::Coerce(..)
| ty::PredicateKind::Subtype(..)
| ty::PredicateKind::WellFormed(..)
| ty::PredicateKind::ObjectSafe(..)
| ty::PredicateKind::ClosureKind(..)
| ty::PredicateKind::TypeOutlives(..)
| ty::PredicateKind::ConstEvaluatable(..)
| ty::PredicateKind::ConstEquate(..)
| ty::PredicateKind::TypeWellFormedFromEnv(..) => None,
ty::PredicateKind::RegionOutlives(ty::OutlivesPredicate(r_a, r_b)) => {
Some(OutlivesBound::RegionSubRegion(r_b, r_a))
}
})
}
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