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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 | 221402e86301a9680f6c0dbee197ce83b0ff99e3 (patch) | |
| tree | 22c08a1526d62408785186959051e70408c930b3 | |
| parent | 01affeb53a32f2e29bb90ebd3eff4c4c687e6746 (diff) | |
| parent | a11756ca757e37aa19fb5101aa44f8c82cd17d81 (diff) | |
| download | rust-221402e86301a9680f6c0dbee197ce83b0ff99e3.tar.gz rust-221402e86301a9680f6c0dbee197ce83b0ff99e3.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 | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/example/mini_core.rs b/example/mini_core.rs index 67a0d0dabea..39988cf64e5 100644 --- a/example/mini_core.rs +++ b/example/mini_core.rs @@ -8,6 +8,7 @@ rustc_attrs, transparent_unions, auto_traits, + freeze_impls, thread_local )] #![no_core] |