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use infer::canonical::{Canonical, Canonicalized, CanonicalizedQueryResult, QueryResult};
use traits::query::Fallible;
use ty::{ParamEnvAnd, Predicate, TyCtxt};
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
pub struct ProvePredicate<'tcx> {
pub predicate: Predicate<'tcx>,
}
impl<'tcx> ProvePredicate<'tcx> {
pub fn new(predicate: Predicate<'tcx>) -> Self {
ProvePredicate { predicate }
}
}
impl<'gcx: 'tcx, 'tcx> super::QueryTypeOp<'gcx, 'tcx> for ProvePredicate<'tcx> {
type QueryResult = ();
fn try_fast_path(
_tcx: TyCtxt<'_, 'gcx, 'tcx>,
_key: &ParamEnvAnd<'tcx, Self>,
) -> Option<Self::QueryResult> {
None
}
fn perform_query(
tcx: TyCtxt<'_, 'gcx, 'tcx>,
canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Self>>,
) -> Fallible<CanonicalizedQueryResult<'gcx, ()>> {
tcx.type_op_prove_predicate(canonicalized)
}
fn shrink_to_tcx_lifetime(
v: &'a CanonicalizedQueryResult<'gcx, ()>,
) -> &'a Canonical<'tcx, QueryResult<'tcx, ()>> {
v
}
}
BraceStructTypeFoldableImpl! {
impl<'tcx> TypeFoldable<'tcx> for ProvePredicate<'tcx> {
predicate,
}
}
BraceStructLiftImpl! {
impl<'a, 'tcx> Lift<'tcx> for ProvePredicate<'a> {
type Lifted = ProvePredicate<'tcx>;
predicate,
}
}
impl_stable_hash_for! {
struct ProvePredicate<'tcx> { predicate }
}