creating suggestion

clippy_lints/src/if_let_mutex.rs

@@ -30,7 +30,7 @@ declare_clippy_lint! {
     /// ```
     pub IF_LET_MUTEX,
     correctness,
-    "locking a `Mutex` in an `if let` block can cause deadlock"
+    "locking a `Mutex` in an `if let` block can cause deadlocks"
 }
 
 declare_lint_pass!(IfLetMutex => [IF_LET_MUTEX]);

tests/ui/redundant_pattern_matching.rs

@@ -85,6 +85,7 @@ fn main() {
 
     let _ = does_something();
     let _ = returns_unit();
+    let _ = issue_5271();
 
     let opt = Some(false);
     let x = if let Some(_) = opt { true } else { false };
@@ -112,3 +113,10 @@ fn returns_unit() {
         false
     };
 }
+
+fn issue_5271() {
+    let hello = Some(String::from("hello"));
+    let _x = match hello {
+        s @ _ => drop(s),
+    };
+}