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Type inference of inferred repeat expr counts is not as strong as it could be #140855

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BoxyUwU opened this issue May 9, 2025 · 0 comments
Open

Type inference of inferred repeat expr counts is not as strong as it could be #140855

BoxyUwU opened this issue May 9, 2025 · 0 comments
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A-array Area: `[T; N]` C-bug Category: This is a bug. F-generic_arg_infer Using `_` as a const argument: #![feature(generic_arg_infer)]` F-marker_trait_attr `#![feature(marker_trait_attr)]` 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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BoxyUwU commented May 9, 2025

See the FCP writeup for inference of inferred repeat expr counts: #139635 (comment)

Once marker traits are stable we should experiment with a RepeatExprWf lang item trait in core with marker impls for [T: Copy; N], [T; 0] and [T; 1] which will allow for proper ability to defer/stall the repeat expr wf checks.
@BoxyUwU BoxyUwU added T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. C-bug Category: This is a bug. F-marker_trait_attr `#![feature(marker_trait_attr)]` A-array Area: `[T; N]` T-types Relevant to the types team, which will review and decide on the PR/issue. F-generic_arg_infer Using `_` as a const argument: #![feature(generic_arg_infer)]` labels May 9, 2025
@rustbot rustbot added the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label May 9, 2025
@BoxyUwU BoxyUwU removed the needs-triage This issue may need triage. Remove it if it has been sufficiently triaged. label May 9, 2025
@BoxyUwU BoxyUwU mentioned this issue May 9, 2025
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A-array Area: `[T; N]` C-bug Category: This is a bug. F-generic_arg_infer Using `_` as a const argument: #![feature(generic_arg_infer)]` F-marker_trait_attr `#![feature(marker_trait_attr)]` 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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