56 lines
2.0 KiB
Rust
56 lines
2.0 KiB
Rust
use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
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use crate::traits::query::dropck_outlives::{trivial_dropck_outlives, DropckOutlivesResult};
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use crate::traits::query::Fallible;
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use rustc::ty::{ParamEnvAnd, Ty, TyCtxt};
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#[derive(Copy, Clone, Debug, HashStable, TypeFoldable, Lift)]
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pub struct DropckOutlives<'tcx> {
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dropped_ty: Ty<'tcx>,
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}
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impl<'tcx> DropckOutlives<'tcx> {
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pub fn new(dropped_ty: Ty<'tcx>) -> Self {
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DropckOutlives { dropped_ty }
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}
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}
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impl super::QueryTypeOp<'tcx> for DropckOutlives<'tcx> {
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type QueryResponse = DropckOutlivesResult<'tcx>;
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fn try_fast_path(
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tcx: TyCtxt<'tcx>,
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key: &ParamEnvAnd<'tcx, Self>,
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) -> Option<Self::QueryResponse> {
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if trivial_dropck_outlives(tcx, key.value.dropped_ty) {
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Some(DropckOutlivesResult::default())
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} else {
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None
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}
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}
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fn perform_query(
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tcx: TyCtxt<'tcx>,
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canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
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) -> Fallible<CanonicalizedQueryResponse<'tcx, Self::QueryResponse>> {
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// Subtle: note that we are not invoking
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// `infcx.at(...).dropck_outlives(...)` here, but rather the
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// underlying `dropck_outlives` query. This same underlying
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// query is also used by the
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// `infcx.at(...).dropck_outlives(...)` fn. Avoiding the
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// wrapper means we don't need an infcx in this code, which is
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// good because the interface doesn't give us one (so that we
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// know we are not registering any subregion relations or
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// other things).
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// FIXME convert to the type expected by the `dropck_outlives`
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// query. This should eventually be fixed by changing the
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// *underlying query*.
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let canonicalized = canonicalized.unchecked_map(|ParamEnvAnd { param_env, value }| {
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let DropckOutlives { dropped_ty } = value;
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param_env.and(dropped_ty)
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});
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tcx.dropck_outlives(canonicalized)
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}
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}
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