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Rollup merge of #121840 - oli-obk:freeze, r=dtolnay

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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
This commit is contained in:
Jacob Pratt 2024-03-11 03:47:19 -04:00 committed by GitHub
commit 221402e863
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example/mini_core.rs
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@ -8,6 +8,7 @@
rustc_attrs,
transparent_unions,
auto_traits,
freeze_impls,
thread_local
)]
#![no_core]