1 use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
2 use crate::traits::query::Fallible;
3 use rustc_infer::traits::query::OutlivesBound;
4 use rustc_middle::ty::{self, ParamEnvAnd, Ty, TyCtxt};
6 #[derive(Copy, Clone, Debug, HashStable, TypeFoldable, TypeVisitable, Lift)]
7 pub struct ImpliedOutlivesBounds<'tcx> {
11 impl<'tcx> super::QueryTypeOp<'tcx> for ImpliedOutlivesBounds<'tcx> {
12 type QueryResponse = Vec<OutlivesBound<'tcx>>;
16 key: &ParamEnvAnd<'tcx, Self>,
17 ) -> Option<Self::QueryResponse> {
18 // Don't go into the query for things that can't possibly have lifetimes.
19 match key.value.ty.kind() {
20 ty::Tuple(elems) if elems.is_empty() => Some(vec![]),
21 ty::Never | ty::Str | ty::Bool | ty::Char | ty::Int(_) | ty::Uint(_) | ty::Float(_) => {
30 canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
31 ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self::QueryResponse>> {
32 // FIXME this `unchecked_map` is only necessary because the
33 // query is defined as taking a `ParamEnvAnd<Ty>`; it should
34 // take an `ImpliedOutlivesBounds` instead
35 let canonicalized = canonicalized.unchecked_map(|ParamEnvAnd { param_env, value }| {
36 let ImpliedOutlivesBounds { ty } = value;
40 tcx.implied_outlives_bounds(canonicalized)