bump MSRV to 1.49.0

.github/workflows/rust.yml

@@ -26,8 +26,8 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        # test against MSRV and next-MSRV
-        rust: [1.36.0, 1.49.0, stable, nightly]
+        # test against MSRV
+        rust: [1.49.0, stable, nightly]
     steps:
       - uses: actions/checkout@v3
       - uses: dtolnay/rust-toolchain@master

README.md

@@ -21,12 +21,12 @@ To use this crate, add the following to your `Cargo.toml`
 
 ```
 [dependencies]
-conquer-once = "0.3.3"
+conquer-once = "0.4.0"
 ```
 
 ## Minimum Supported Rust Version (MSRV)
 
-The minimum supported Rust version for this crate is 1.36.0.
+The minimum supported Rust version for this crate is 1.49.0.
 
 ## Cargo Features
 

RELEASES.md

@@ -35,4 +35,8 @@
 ### Release `0.3.3`
 
 - improves and clarifies wording of public documentation
-- improves internal documentation around all uses of unsafe code
+- improves internal documentation around all uses of unsafe code
+
+## Release `0.4.0`
+
+- bumps MSRV to 1.49.0

src/lib.rs

@@ -45,6 +45,7 @@
 
 #![cfg_attr(all(not(test), not(feature = "std")), no_std)]
 #![deny(missing_docs)]
+#![forbid(clippy::undocumented_unsafe_blocks)]
 
 #[cfg(test)]
 #[macro_use]

src/spin.rs

@@ -1,10 +1,7 @@
 //! Synchronized one-time and lazy initialization primitives that use spin-locks
 //! in case of concurrent accesses under contention.
 
-// NOTE: spin_loop_hint depracated since 1.51, replacement stable since 1.49,
-// but MSRV is 1.36
-#[allow(deprecated)]
-use core::sync::atomic::{spin_loop_hint, Ordering};
+use core::{hint, sync::atomic::Ordering};
 
 use crate::{
     cell::{Block, Unblock},
@@ -63,10 +60,7 @@ unsafe impl Block for Spin {
     fn block(state: &AtomicOnceState) {
         // (spin:1) this acquire load syncs-with the acq-rel swap (guard:2)
         while let WouldBlock(_) = state.load(Ordering::Acquire).expect(POISON_PANIC_MSG) {
-            // MSRV is currently 1.36.0 and `spin_loop_hint` was only depracated
-            // in 1.51.0
-            #[allow(deprecated)]
-            spin_loop_hint();
+            hint::spin_loop();
         }
     }
 }