Precise capturing in traits #131033
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Precise capturing in traits #131033
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Looks good to me! |
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@spastorino, is this waiting on anything else? I didn't see an |
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@bors r+ |
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…in-traits, r=spastorino Precise capturing in traits This PR begins to implement `feature(precise_capturing_in_traits)`, which enables using the `impl Trait + use<..>` syntax for RPITITs. It implements this by giving the desugared GATs variance, and representing the uncaptured lifetimes as bivariant, like how opaque captures work. Right now, I've left out implementing a necessary extension to the `refining_impl_trait` lint, and also I've made it so that all RPITITs always capture the parameters that come from the trait, because I'm not totally yet convinced that it's sound to not capture these args. It's certainly required to capture the type and const parameters from the trait (e.g. Self), or else users could bivariantly relate two RPITIT args that come from different impls, but region parameters don't affect trait selection in the same way, so it *may* be possible to relax this in the future. Let's stay conservative for now, though. I'm not totally sure what tests could be added on top of the ones I already added, since we really don't need to exercise the `precise_capturing` feature but simply what makes it special for RPITITs. r? types Tracking issue: * rust-lang#130044
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…in-traits, r=spastorino Precise capturing in traits This PR begins to implement `feature(precise_capturing_in_traits)`, which enables using the `impl Trait + use<..>` syntax for RPITITs. It implements this by giving the desugared GATs variance, and representing the uncaptured lifetimes as bivariant, like how opaque captures work. Right now, I've left out implementing a necessary extension to the `refining_impl_trait` lint, and also I've made it so that all RPITITs always capture the parameters that come from the trait, because I'm not totally yet convinced that it's sound to not capture these args. It's certainly required to capture the type and const parameters from the trait (e.g. Self), or else users could bivariantly relate two RPITIT args that come from different impls, but region parameters don't affect trait selection in the same way, so it *may* be possible to relax this in the future. Let's stay conservative for now, though. I'm not totally sure what tests could be added on top of the ones I already added, since we really don't need to exercise the `precise_capturing` feature but simply what makes it special for RPITITs. r? types Tracking issue: * rust-lang#130044
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Needs rebase. @bors r- |
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☔ The latest upstream changes (presumably #131263) made this pull request unmergeable. Please resolve the merge conflicts. |
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…in-traits, r=spastorino Precise capturing in traits This PR begins to implement `feature(precise_capturing_in_traits)`, which enables using the `impl Trait + use<..>` syntax for RPITITs. It implements this by giving the desugared GATs variance, and representing the uncaptured lifetimes as bivariant, like how opaque captures work. Right now, I've left out implementing a necessary extension to the `refining_impl_trait` lint, and also I've made it so that all RPITITs always capture the parameters that come from the trait, because I'm not totally yet convinced that it's sound to not capture these args. It's certainly required to capture the type and const parameters from the trait (e.g. Self), or else users could bivariantly relate two RPITIT args that come from different impls, but region parameters don't affect trait selection in the same way, so it *may* be possible to relax this in the future. Let's stay conservative for now, though. I'm not totally sure what tests could be added on top of the ones I already added, since we really don't need to exercise the `precise_capturing` feature but simply what makes it special for RPITITs. r? types Tracking issue: * rust-lang#130044
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…iaskrgr Rollup of 9 pull requests Successful merges: - rust-lang#130308 (codegen_ssa: consolidate tied target checks) - rust-lang#130538 (Stabilize const `{slice,array}::from_mut`) - rust-lang#130741 (rustc_target: Add sme-b16b16 as an explicit aarch64 target feature) - rust-lang#131033 (Precise capturing in traits) - rust-lang#131442 (Match std `RUSTFLAGS` for host and target for `mir-opt` test suite to fix double std build/rebuilds) - rust-lang#131470 (add test infra to explicitely test rustc with autodiff/enzyme disabled) - rust-lang#131475 (Compiler & its UI tests: Rename remaining occurrences of "object safe" to "dyn compatible" ) - rust-lang#131493 (Avoid redundant sysroot additions to `PATH` when linking) - rust-lang#131509 (Update .mailmap) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#131033 - compiler-errors:precise-capturing-in-traits, r=spastorino Precise capturing in traits This PR begins to implement `feature(precise_capturing_in_traits)`, which enables using the `impl Trait + use<..>` syntax for RPITITs. It implements this by giving the desugared GATs variance, and representing the uncaptured lifetimes as bivariant, like how opaque captures work. Right now, I've left out implementing a necessary extension to the `refining_impl_trait` lint, and also I've made it so that all RPITITs always capture the parameters that come from the trait, because I'm not totally yet convinced that it's sound to not capture these args. It's certainly required to capture the type and const parameters from the trait (e.g. Self), or else users could bivariantly relate two RPITIT args that come from different impls, but region parameters don't affect trait selection in the same way, so it *may* be possible to relax this in the future. Let's stay conservative for now, though. I'm not totally sure what tests could be added on top of the ones I already added, since we really don't need to exercise the `precise_capturing` feature but simply what makes it special for RPITITs. r? types Tracking issue: * rust-lang#130044
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This PR begins to implement
feature(precise_capturing_in_traits), which enables using theimpl Trait + use<..>syntax for RPITITs. It implements this by giving the desugared GATs variance, and representing the uncaptured lifetimes as bivariant, like how opaque captures work.Right now, I've left out implementing a necessary extension to the
refining_impl_traitlint, and also I've made it so that all RPITITs always capture the parameters that come from the trait, because I'm not totally yet convinced that it's sound to not capture these args. It's certainly required to capture the type and const parameters from the trait (e.g. Self), or else users could bivariantly relate two RPITIT args that come from different impls, but region parameters don't affect trait selection in the same way, so it may be possible to relax this in the future. Let's stay conservative for now, though.I'm not totally sure what tests could be added on top of the ones I already added, since we really don't need to exercise the
precise_capturingfeature but simply what makes it special for RPITITs.r? types
Tracking issue: