Remove once_cell dep by replacing once_cell::sync::OnceCell with std::sync::OnceLock

Author: rukai

Cargo.toml

@@ -37,7 +37,6 @@ flaky_tests = []
 prost = ["prost-types"]
 
 [dependencies]
-once_cell = "1.4"
 prost-types = { version = "0.11", default-features = false, optional = true }
 crossbeam-utils = "0.8.5"
 

src/lib.rs

@@ -141,11 +141,10 @@
 #![allow(clippy::must_use_candidate)]
 
 use crossbeam_utils::atomic::AtomicCell;
+use std::sync::OnceLock;
 use std::time::Duration;
 use std::{cell::RefCell, sync::Arc};
 
-use once_cell::sync::OnceCell;
-
 mod clocks;
 use self::clocks::{Counter, Monotonic};
 mod detection;
@@ -159,13 +158,13 @@ mod stats;
 use self::stats::Variance;
 
 // Global clock, used by `Instant::now`.
-static GLOBAL_CLOCK: OnceCell<Clock> = OnceCell::new();
+static GLOBAL_CLOCK: OnceLock<Clock> = OnceLock::new();
 
 // Global recent measurement, used by `Clock::recent` and `Instant::recent`.
 static GLOBAL_RECENT: AtomicCell<u64> = AtomicCell::new(0);
 
 // Global calibration, shared by all clocks.
-static GLOBAL_CALIBRATION: OnceCell<Calibration> = OnceCell::new();
+static GLOBAL_CALIBRATION: OnceLock<Calibration> = OnceLock::new();
 
 // Per-thread clock override, used by `quanta::with_clock`, `Instant::now`, and sometimes `Instant::recent`.
 thread_local! {