1 files changed, 48 insertions, 0 deletions
diff --git a/tests/ui/lint/lint-invalid-atomic-ordering-exchange.rs b/tests/ui/lint/lint-invalid-atomic-ordering-exchange.rs
new file mode 100644
index 00000000000..488d268eee8
--- /dev/null
+++ b/tests/ui/lint/lint-invalid-atomic-ordering-exchange.rs
@@ -0,0 +1,48 @@
+// only-x86_64
+use std::sync::atomic::{AtomicUsize, Ordering};
+
+fn main() {
+    // `compare_exchange` (not weak) testing
+    let x = AtomicUsize::new(0);
+
+    // Allowed ordering combos
+    let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Relaxed);
+    let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Acquire);
+    let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::SeqCst);
+    let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Relaxed);
+    let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Acquire);
+    let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::SeqCst);
+    let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Relaxed);
+    let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Acquire);
+    let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::SeqCst);
+    let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Relaxed);
+    let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Acquire);
+    let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::SeqCst);
+    let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Relaxed);
+    let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Acquire);
+    let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::SeqCst);
+
+    // AcqRel is always forbidden as a failure ordering
+    let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::AcqRel);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::AcqRel);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::AcqRel);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::AcqRel);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::AcqRel);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+
+    // Release is always forbidden as a failure ordering
+    let _ = x.compare_exchange(0, 0, Ordering::Relaxed, Ordering::Release);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::Acquire, Ordering::Release);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::Release, Ordering::Release);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::AcqRel, Ordering::Release);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+    let _ = x.compare_exchange(0, 0, Ordering::SeqCst, Ordering::Release);
+    //~^ ERROR `compare_exchange`'s failure ordering may not be `Release` or `AcqRel`
+}