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Relax a memory order in `once_box` per https://github.com/rust-lang/rust/pull/131094#discussion_r1788536445. In the successful path we don't need `Acquire` since we don't care if the store in `f()` happened in other threads has become visible to the current thread. We'll use our own results instead and just using `Release` to ensure other threads can see our store to `Box` when they fail the `compare_exchange` will suffice. Also took https://marabos.nl/atomics/memory-ordering.html#example-lazy-initialization-with-indirection as a reference. `@rustbot` label: +T-libs r? `@ibraheemdev` |
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| proc_macro | ||
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| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@c881fe3231 | ||
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| unwind | ||
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| Cargo.toml | ||