Fix all warnings from the latest Clippy (#1123)

Author: powergee

Cargo.toml

@@ -69,3 +69,7 @@ unexpected_cfgs = { level = "warn", check-cfg = [
 ] }
 unreachable_pub = "warn"
 # unsafe_op_in_unsafe_fn = "warn" # Set at crate-level instead since https://github.com/rust-lang/rust/pull/100081 is not available on MSRV
+
+[workspace.lints.clippy]
+# Suppress buggy or noisy clippy lints
+declare_interior_mutable_const = { level = "allow", priority = 1 } # https://github.com/rust-lang/rust-clippy/issues/7665

crossbeam-channel/src/select_macro.rs

@@ -687,7 +687,7 @@ macro_rules! crossbeam_channel_internal {
         const _LEN: usize = $crate::crossbeam_channel_internal!(@count ($($cases)*));
         let _handle: &dyn $crate::internal::SelectHandle = &$crate::never::<()>();
 
-        #[allow(unused_mut)]
+        #[allow(unused_mut, clippy::zero_repeat_side_effects)]
         let mut _sel = [(_handle, 0, ::std::ptr::null()); _LEN];
 
         $crate::crossbeam_channel_internal!(

crossbeam-skiplist/src/lib.rs

@@ -91,9 +91,9 @@
 //! A solution to the above is to have the implementation wrap
 //! each value in a lock. However, this has some repercussions:
 //! * The map would no longer be lock-free, inhibiting scalability
-//! and allowing for deadlocks.
+//!   and allowing for deadlocks.
 //! * If a user of the map doesn't need mutable access, then they pay
-//! the price of locks without actually needing them.
+//!   the price of locks without actually needing them.
 //!
 //! Instead, the approach taken by this crate gives more control to the user.
 //! If mutable access is needed, then you can use interior mutability,
@@ -150,7 +150,7 @@
 //! Crossbeam [does not currently provide a concurrent unordered map](https://github.com/crossbeam-rs/rfcs/issues/32).
 //! That said, here are some other crates which may suit you:
 //! * [`DashMap`](https://docs.rs/dashmap) implements a novel concurrent hash map
-//! with good performance characteristics.
+//!   with good performance characteristics.
 //! * [`flurry`](https://docs.rs/flurry) is a Rust port of Java's `ConcurrentHashMap`.
 //!
 //! [`insert`]: SkipMap::insert

crossbeam-utils/src/atomic/atomic_cell.rs

@@ -972,7 +972,6 @@ fn lock(addr: usize) -> &'static SeqLock {
     // stored at addresses that are multiples of 3. It'd be too bad if `LEN` was divisible by 3.
     // In order to protect from such cases, we simply choose a large prime number for `LEN`.
     const LEN: usize = 67;
-    #[allow(clippy::declare_interior_mutable_const)]
     const L: CachePadded<SeqLock> = CachePadded::new(SeqLock::new());
     static LOCKS: [CachePadded<SeqLock>; LEN] = [L; LEN];