Customize tests for Miri & add Miri to CI

Closes issue #7.

.github/workflows/ci.yml

@@ -71,6 +71,23 @@ jobs:
           LOOM_MAX_PREEMPTIONS: 3 
           RUSTFLAGS: --cfg st3_loom
 
+  miri:
+    name: Miri
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+
+      - name: Install toolchain
+        uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: miri
+
+      - name: Run cargo miri
+        run: cargo miri test
+        env:
+          MIRIFLAGS: -Zmiri-strict-provenance
+
   lints:
     name: Lints
     runs-on: ubuntu-latest

src/fifo.rs

@@ -40,7 +40,7 @@ use alloc::sync::Arc;
 
 use core::alloc::Layout;
 use core::iter::FusedIterator;
-use core::mem::{drop, transmute, MaybeUninit};
+use core::mem::{transmute, MaybeUninit};
 use core::panic::{RefUnwindSafe, UnwindSafe};
 use core::sync::atomic::Ordering::{AcqRel, Acquire, Relaxed, Release};
 
@@ -280,8 +280,8 @@ impl<T> Worker<T> {
     /// can in particular be used to perform a cheap equality check with another
     /// `Stealer` and verify that it is associated to the same `Worker`.
     pub fn stealer_ref(&self) -> &Stealer<T> {
-        // Sanity checks to assess that `queue` has indeed the size and
-        // alignment of a `Stealer` (this assert is optimized in release mode).
+        // Sanity check to assess that `queue` has indeed the size and alignment
+        // of a `Stealer` (this assert is optimized away in release mode).
         assert_eq!(Layout::for_value(&self.queue), Layout::new::<Stealer<T>>());
 
         // Safety: `self.queue` has the size and alignment of `Stealer` since

src/lifo.rs

@@ -40,7 +40,7 @@ use alloc::sync::Arc;
 
 use core::alloc::Layout;
 use core::iter::FusedIterator;
-use core::mem::{drop, transmute, MaybeUninit};
+use core::mem::{transmute, MaybeUninit};
 use core::panic::{RefUnwindSafe, UnwindSafe};
 use core::sync::atomic::Ordering::{Acquire, Relaxed, Release};
 
@@ -324,8 +324,8 @@ impl<T> Worker<T> {
     /// can in particular be used to perform a cheap equality check with another
     /// `Stealer` and verify that it is associated to the same `Worker`.
     pub fn stealer_ref(&self) -> &Stealer<T> {
-        // Sanity checks to assess that `queue` has indeed the size and
-        // alignment of a `Stealer` (this assert is optimized in release mode).
+        // Sanity check to assess that `queue` has indeed the size and alignment
+        // of a `Stealer` (this assert is optimized away in release mode).
         assert_eq!(Layout::for_value(&self.queue), Layout::new::<Stealer<T>>());
 
         // Safety: `self.queue` has the size and alignment of `Stealer` since