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Rollup merge of #139858 - oli-obk:new-const-traits-syntax, r=fee1-dead

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New const traits syntax

This PR only affects the AST and doesn't actually change anything semantically.

All occurrences of `~const` outside of libcore have been replaced by `[const]`. Within libcore we have to wait for rustfmt to be bumped in the bootstrap compiler. This will happen "automatically" (when rustfmt is run) during the bootstrap bump, as rustfmt converts `~const` into `[const]`. After this we can remove the `~const` support from the parser

Caveat discovered during impl: there is no legacy bare trait object recovery for `[const] Trait` as that snippet in type position goes down the slice /array parsing code and will error

r? ``@fee1-dead``

cc ``@nikomatsakis`` ``@traviscross`` ``@compiler-errors``
This commit is contained in:
Matthias Krüger
2025-06-27 22:13:00 +02:00
committed by GitHub
parent fe5f3dedf7 512ff95206
commit 36c2b011cb
243 changed files with 1641 additions and 1571 deletions
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2
compiler/rustc_feature/src/unstable.rs
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@@ -437,7 +437,7 @@ declare_features! (
(unstable, const_async_blocks, "1.53.0", Some(85368)),
/// Allows `const || {}` closures in const contexts.
(incomplete, const_closures, "1.68.0", Some(106003)),
/// Allows using `~const Destruct` bounds and calling drop impls in const contexts.
/// Allows using `[const] Destruct` bounds and calling drop impls in const contexts.
(unstable, const_destruct, "1.85.0", Some(133214)),
/// Allows `for _ in _` loops in const contexts.
(unstable, const_for, "1.56.0", Some(87575)),