#[feature] not required for lint result

src/test/ui/lint/must_not_suspend/mutex.rs

@@ -1,5 +1,4 @@
 // edition:2018
-#![feature(must_not_suspend)]
 #![deny(must_not_suspend)]
 
 async fn other() {}

src/test/ui/lint/must_not_suspend/mutex.stderr

@@ -1,5 +1,5 @@
 error: `MutexGuard` held across a suspend point, but should not be
-  --> $DIR/mutex.rs:8:9
+  --> $DIR/mutex.rs:7:9
    |
 LL |     let _guard = m.lock().unwrap();
    |         ^^^^^^
@@ -7,17 +7,17 @@ LL |     other().await;
    |     ------------- the value is held across this suspend point
    |
 note: the lint level is defined here
-  --> $DIR/mutex.rs:3:9
+  --> $DIR/mutex.rs:2:9
    |
 LL | #![deny(must_not_suspend)]
    |         ^^^^^^^^^^^^^^^^
 note: Holding a MutexGuard across suspend points can cause deadlocks, delays, and cause Future's to not implement `Send`
-  --> $DIR/mutex.rs:8:9
+  --> $DIR/mutex.rs:7:9
    |
 LL |     let _guard = m.lock().unwrap();
    |         ^^^^^^
 help: consider using a block (`{ ... }`) to shrink the value's scope, ending before the suspend point
-  --> $DIR/mutex.rs:8:9
+  --> $DIR/mutex.rs:7:9
    |
 LL |     let _guard = m.lock().unwrap();
    |         ^^^^^^