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Auto merge of #53580 - nikomatsakis:nll-issue-53568, r=pnkfelix
fix NLL ICEs Custom type-ops reuse some of the query machinery -- but while query results are canonicalized after they are constructed, custom type ops are not, and hence we have to resolve the type variables to avoid an ICE here. Also, use the type-op machinery for implied outlives bounds. Fixes #53568 Fixes #52992 Fixes #53680
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src/librustc/traits/query/type_op/implied_outlives_bounds.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // 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 (#53568) -- we failed to | ||
| // resolve inference variables in "custom type-ops". | ||
| // | ||
| // compile-pass | ||
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| #![feature(nll)] | ||
| #![allow(dead_code)] | ||
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| trait Future { | ||
| type Item; | ||
| } | ||
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| impl<F, T> Future for F | ||
| where F: Fn() -> T | ||
| { | ||
| type Item = T; | ||
| } | ||
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| trait Connect {} | ||
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| struct Connector<H> { | ||
| handler: H, | ||
| } | ||
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| impl<H, T> Connect for Connector<H> | ||
| where | ||
| T: 'static, | ||
| H: Future<Item = T> | ||
| { | ||
| } | ||
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| struct Client<C> { | ||
| connector: C, | ||
| } | ||
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| fn build<C>(_connector: C) -> Client<C> { | ||
| unimplemented!() | ||
| } | ||
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| fn client<H>(handler: H) -> Client<impl Connect> | ||
| where H: Fn() + Copy | ||
| { | ||
| let connector = Connector { | ||
| handler, | ||
| }; | ||
| let client = build(connector); | ||
| client | ||
| } | ||
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| fn main() { } | ||
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