Bump MSRV to 1.62

Author: spacejam

README.md

@@ -161,7 +161,7 @@ extreme::run(async move {
 
 # minimum supported Rust version (MSRV)
 
-We support Rust 1.57.0 and up.
+We support Rust 1.62 and up.
 
 # architecture
 

scripts/cross_compile.sh

@@ -12,10 +12,10 @@ rustup update --no-self-update
 
 RUSTFLAGS="--cfg miri" cargo check
 
-rustup toolchain install 1.57.0 --no-self-update
+rustup toolchain install 1.62 --no-self-update
 cargo clean
 rm Cargo.lock
-cargo +1.57.0 check
+cargo +1.62 check
 
 for target in $targets; do
   echo "setting up $target..."

src/ebr/atomic.rs

@@ -720,7 +720,7 @@ impl<'g, T> Shared<'g, T> {
 
 impl<'g, T: ?Sized + Pointable> Shared<'g, T> {
     /// Returns a new null pointer.
-    pub(crate) fn null() -> Shared<'g, T> {
+    pub(crate) const fn null() -> Shared<'g, T> {
         Shared { data: 0, _marker: PhantomData }
     }