1 files changed, 21 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/mut_mutex_lock.rs b/src/tools/clippy/tests/ui/mut_mutex_lock.rs
new file mode 100644
index 000000000..ea60df5ae
--- /dev/null
+++ b/src/tools/clippy/tests/ui/mut_mutex_lock.rs
@@ -0,0 +1,21 @@
+// run-rustfix
+#![allow(dead_code, unused_mut)]
+#![warn(clippy::mut_mutex_lock)]
+
+use std::sync::{Arc, Mutex};
+
+fn mut_mutex_lock() {
+    let mut value_rc = Arc::new(Mutex::new(42_u8));
+    let value_mutex = Arc::get_mut(&mut value_rc).unwrap();
+
+    let mut value = value_mutex.lock().unwrap();
+    *value += 1;
+}
+
+fn no_owned_mutex_lock() {
+    let mut value_rc = Arc::new(Mutex::new(42_u8));
+    let mut value = value_rc.lock().unwrap();
+    *value += 1;
+}
+
+fn main() {}