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use infer::canonical::{Canonical, Canonicalized, CanonicalizedQueryResult, QueryResult};
use traits::query::dropck_outlives::trivial_dropck_outlives;
use traits::query::dropck_outlives::DropckOutlivesResult;
use traits::query::Fallible;
use ty::{ParamEnvAnd, Ty, TyCtxt};
#[derive(Copy, Clone, Debug)]
pub struct DropckOutlives<'tcx> {
dropped_ty: Ty<'tcx>,
}
impl<'tcx> DropckOutlives<'tcx> {
pub fn new(dropped_ty: Ty<'tcx>) -> Self {
DropckOutlives { dropped_ty }
}
}
impl super::QueryTypeOp<'gcx, 'tcx> for DropckOutlives<'tcx>
where
'gcx: 'tcx,
{
type QueryResult = DropckOutlivesResult<'tcx>;
fn try_fast_path(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
key: &ParamEnvAnd<'tcx, Self>,
) -> Option<Self::QueryResult> {
if trivial_dropck_outlives(tcx, key.value.dropped_ty) {
Some(DropckOutlivesResult::default())
} else {
None
}
}
fn perform_query(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Self>>,
) -> Fallible<CanonicalizedQueryResult<'gcx, Self::QueryResult>> {
let Canonical {
variables,
value:
ParamEnvAnd {
param_env,
value: DropckOutlives { dropped_ty },
},
} = canonicalized;
let canonicalized = Canonical {
variables,
value: param_env.and(dropped_ty),
};
tcx.dropck_outlives(canonicalized)
}
fn shrink_to_tcx_lifetime(
lifted_query_result: &'a CanonicalizedQueryResult<'gcx, Self::QueryResult>,
) -> &'a Canonical<'tcx, QueryResult<'tcx, Self::QueryResult>> {
lifted_query_result
}
}
BraceStructTypeFoldableImpl! {
impl<'tcx> TypeFoldable<'tcx> for DropckOutlives<'tcx> {
dropped_ty
}
}
BraceStructLiftImpl! {
impl<'a, 'tcx> Lift<'tcx> for DropckOutlives<'a> {
type Lifted = DropckOutlives<'tcx>;
dropped_ty
}
}
impl_stable_hash_for! {
struct DropckOutlives<'tcx> { dropped_ty }
}