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use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
use crate::traits::query::Fallible;
use rustc_infer::traits::query::OutlivesBound;
use rustc_middle::ty::{self, ParamEnvAnd, Ty, TyCtxt};
#[derive(Copy, Clone, Debug, HashStable, TypeFoldable, TypeVisitable, Lift)]
pub struct ImpliedOutlivesBounds<'tcx> {
pub ty: Ty<'tcx>,
}
impl<'tcx> super::QueryTypeOp<'tcx> for ImpliedOutlivesBounds<'tcx> {
type QueryResponse = Vec<OutlivesBound<'tcx>>;
fn try_fast_path(
_tcx: TyCtxt<'tcx>,
key: &ParamEnvAnd<'tcx, Self>,
) -> Option<Self::QueryResponse> {
// Don't go into the query for things that can't possibly have lifetimes.
match key.value.ty.kind() {
ty::Tuple(elems) if elems.is_empty() => Some(vec![]),
ty::Never | ty::Str | ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) => {
Some(vec![])
}
_ => None,
}
}
fn perform_query(
tcx: TyCtxt<'tcx>,
canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
) -> Fallible<CanonicalizedQueryResponse<'tcx, Self::QueryResponse>> {
// FIXME this `unchecked_map` is only necessary because the
// query is defined as taking a `ParamEnvAnd<Ty>`; it should
// take an `ImpliedOutlivesBounds` instead
let canonicalized = canonicalized.unchecked_map(|ParamEnvAnd { param_env, value }| {
let ImpliedOutlivesBounds { ty } = value;
param_env.and(ty)
});
tcx.implied_outlives_bounds(canonicalized)
}
}
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