Use `OnceLock` for `SingleCache` This uses `OnceLock` for `SingleCache` instead of `Lock<Option<T>>` so lookups are lock-free. r? `@cjgillot`
For more information about how rustc works, see the rustc dev guide.
Use `OnceLock` for `SingleCache` This uses `OnceLock` for `SingleCache` instead of `Lock<Option<T>>` so lookups are lock-free. r? `@cjgillot`
For more information about how rustc works, see the rustc dev guide.