Use more efficient thread_local! { … = const { … } }
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These don't require an initialization check on every access, which should at least be useful for the `CURRENT_STATE` `thread_local!` in `tracing-core`. Probably can't be included any time soon, as this requires Rust 1.59: rust-lang/rust#91355 (comment).
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These don't require an initialization check on every access, which
should at least be useful for the
CURRENT_STATEthread_local!intracing-core.Probably can't be included any time soon, as this requires Rust 1.59:
rust-lang/rust#91355 (comment).