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| author | Jacob Pratt <jacob@jhpratt.dev> | 2024-03-11 03:47:19 -0400 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-03-11 03:47:19 -0400 |
| commit | a6202e2a77ddd89879c8783cc14670e251580f0e (patch) | |
| tree | e824d8659835e406204eae46ec3ab3044e080d0f | |
| parent | 0031b219b6d5205d1f884dbd4b21ed48fa70a63d (diff) | |
| parent | 3ca0c5913e6f956014c4f2281b7d67f775ef4b3c (diff) | |
| download | rust-a6202e2a77ddd89879c8783cc14670e251580f0e.tar.gz rust-a6202e2a77ddd89879c8783cc14670e251580f0e.zip | |
Rollup merge of #121840 - oli-obk:freeze, r=dtolnay
Expose the Freeze trait again (unstably) and forbid implementing it manually non-emoji version of https://github.com/rust-lang/rust/pull/121501 cc #60715 This trait is useful for generic constants (associated consts of generic traits). See the test (`tests/ui/associated-consts/freeze.rs`) added in this PR for a usage example. The builtin `Freeze` trait is the only way to do it, users cannot work around this issue. It's also a useful trait for building some very specific abstrations, as shown by the usage by the `zerocopy` crate: https://github.com/google/zerocopy/issues/941 cc ```@RalfJung``` T-lang signed off on reexposing this unstably: https://github.com/rust-lang/rust/pull/121501#issuecomment-1969827742
| -rw-r--r-- | example/mini_core.rs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/example/mini_core.rs b/example/mini_core.rs index cc3d647c8c8..a868471ed1d 100644 --- a/example/mini_core.rs +++ b/example/mini_core.rs @@ -1,6 +1,6 @@ #![feature( no_core, lang_items, intrinsics, unboxed_closures, type_ascription, extern_types, - decl_macro, rustc_attrs, transparent_unions, auto_traits, + decl_macro, rustc_attrs, transparent_unions, auto_traits, freeze_impls, thread_local )] #![no_core] |