pub const ONCE_INIT: Once = <Once>::new()
Initialization value for static Once
values.
use std::sync::{Once, ONCE_INIT}; static START: Once = ONCE_INIT;
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Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/sync/constant.ONCE_INIT.html