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nested TAITs/ATPITs should reject higher-ranked regions #122093

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compiler-errors opened this issue Mar 6, 2024 · 0 comments · Fixed by #122103
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nested TAITs/ATPITs should reject higher-ranked regions #122093

compiler-errors opened this issue Mar 6, 2024 · 0 comments · Fixed by #122103
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A-lifetimes Area: Lifetimes / regions F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.

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compiler-errors commented Mar 6, 2024 •
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type TAIT = impl for<'a> Foo<'a, Assoc = impl Sized>;
                                         ^^^^^^^^^^

should be a hard error.
@compiler-errors compiler-errors added the F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` label Mar 6, 2024
@compiler-errors compiler-errors self-assigned this Mar 6, 2024
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label Mar 6, 2024
@compiler-errors compiler-errors mentioned this issue Mar 6, 2024
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@compiler-errors compiler-errors changed the title nested TAITs should reject higher-ranked regions nested TAITs/ATPITs should reject higher-ranked regions Mar 6, 2024
@fmease fmease added A-lifetimes Area: Lifetimes / regions T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue. and removed needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. labels Mar 6, 2024
@compiler-errors compiler-errors mentioned this issue Mar 6, 2024
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@bors bors closed this as completed in d4d18d2 Mar 8, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this issue Mar 8, 2024
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Unrolled build for rust-lang#122103
bdb9576 
Rollup merge of rust-lang#122103 - compiler-errors:taits-capture-everything, r=oli-obk

Make TAITs and ATPITs capture late-bound lifetimes in scope

This generalizes the behavior that RPITs have, where they duplicate their in-scope lifetimes so that they will always *reify* late-bound lifetimes that they capture. This allows TAITs and ATPITs to properly error when they capture in-scope late-bound lifetimes.

r? `@oli-obk` cc `@aliemjay`

Fixes rust-lang#122093 and therefore rust-lang#120700 (comment)
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A-lifetimes Area: Lifetimes / regions F-type_alias_impl_trait `#[feature(type_alias_impl_trait)]` T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. T-types Relevant to the types team, which will review and decide on the PR/issue.
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Make TAITs and ATPITs capture late-bound lifetimes in scope compiler-errors/rust
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