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use
TypeOp machinery for outlives_bounds
Fixes rust-lang#52992
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src/librustc/traits/query/type_op/implied_outlives_bounds.rs
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| @@ -0,0 +1,80 @@ | ||
| // Copyright 2016 The Rust Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution and at | ||
| // http://rust-lang.org/COPYRIGHT. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
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| use infer::canonical::{Canonical, Canonicalized, CanonicalizedQueryResult, QueryResult}; | ||
| use traits::query::outlives_bounds::OutlivesBound; | ||
| use traits::query::Fallible; | ||
| use ty::{ParamEnvAnd, Ty, TyCtxt}; | ||
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| #[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)] | ||
| pub struct ImpliedOutlivesBounds<'tcx> { | ||
| pub ty: Ty<'tcx>, | ||
| } | ||
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| impl<'tcx> ImpliedOutlivesBounds<'tcx> { | ||
| pub fn new(ty: Ty<'tcx>) -> Self { | ||
| ImpliedOutlivesBounds { ty } | ||
| } | ||
| } | ||
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| impl<'gcx: 'tcx, 'tcx> super::QueryTypeOp<'gcx, 'tcx> for ImpliedOutlivesBounds<'tcx> { | ||
| type QueryResult = Vec<OutlivesBound<'tcx>>; | ||
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| fn try_fast_path( | ||
| _tcx: TyCtxt<'_, 'gcx, 'tcx>, | ||
| _key: &ParamEnvAnd<'tcx, Self>, | ||
| ) -> Option<Self::QueryResult> { | ||
| None | ||
| } | ||
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| fn perform_query( | ||
| tcx: TyCtxt<'_, 'gcx, 'tcx>, | ||
| canonicalized: Canonicalized<'gcx, ParamEnvAnd<'tcx, Self>>, | ||
| ) -> Fallible<CanonicalizedQueryResult<'gcx, Self::QueryResult>> { | ||
| // FIXME the query should take a `ImpliedOutlivesBounds` | ||
| let Canonical { | ||
| variables, | ||
| value: | ||
| ParamEnvAnd { | ||
| param_env, | ||
| value: ImpliedOutlivesBounds { ty }, | ||
| }, | ||
| } = canonicalized; | ||
| let canonicalized = Canonical { | ||
| variables, | ||
| value: param_env.and(ty), | ||
| }; | ||
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| tcx.implied_outlives_bounds(canonicalized) | ||
| } | ||
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| fn shrink_to_tcx_lifetime( | ||
| v: &'a CanonicalizedQueryResult<'gcx, Self::QueryResult>, | ||
| ) -> &'a Canonical<'tcx, QueryResult<'tcx, Self::QueryResult>> { | ||
| v | ||
| } | ||
| } | ||
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| BraceStructTypeFoldableImpl! { | ||
| impl<'tcx> TypeFoldable<'tcx> for ImpliedOutlivesBounds<'tcx> { | ||
| ty, | ||
| } | ||
| } | ||
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| BraceStructLiftImpl! { | ||
| impl<'a, 'tcx> Lift<'tcx> for ImpliedOutlivesBounds<'a> { | ||
| type Lifted = ImpliedOutlivesBounds<'tcx>; | ||
| ty, | ||
| } | ||
| } | ||
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| impl_stable_hash_for! { | ||
| struct ImpliedOutlivesBounds<'tcx> { ty } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| // Copyright 2018 The Rust Project Developers. See the COPYRIGHT | ||
| // file at the top-level directory of this distribution and at | ||
| // http://rust-lang.org/COPYRIGHT. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
| // option. This file may not be copied, modified, or distributed | ||
| // except according to those terms. | ||
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| // Regression test for an NLL-related ICE (#52992) -- computing | ||
| // implied bounds was causing outlives relations that were not | ||
| // properly handled. | ||
| // | ||
| // compile-pass | ||
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| #![feature(nll)] | ||
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| fn main() {} | ||
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| fn fail<'a>() -> Struct<'a, Generic<()>> { | ||
| Struct(&Generic(())) | ||
| } | ||
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| struct Struct<'a, T>(&'a T) where | ||
| T: Trait + 'a, | ||
| T::AT: 'a; // only fails with this bound | ||
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| struct Generic<T>(T); | ||
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| trait Trait { | ||
| type AT; | ||
| } | ||
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| impl<T> Trait for Generic<T> { | ||
| type AT = T; // only fails with a generic AT | ||
| } |