2 files changed, 13 insertions, 1 deletions
diff --git a/tests/ui/stdlib-unit-tests/raw-fat-ptr.rs b/tests/ui/stdlib-unit-tests/raw-fat-ptr.rs
index 0f535523dcc..4a8289cb242 100644
--- a/tests/ui/stdlib-unit-tests/raw-fat-ptr.rs
+++ b/tests/ui/stdlib-unit-tests/raw-fat-ptr.rs
@@ -32,7 +32,7 @@ fn assert_inorder<T: PartialEq + PartialOrd>(a: &[T]) {
     }
 }
 
-trait Foo { fn foo(&self) -> usize; }
+trait Foo { fn foo(&self) -> usize; } //~ WARN method `foo` is never used
 impl<T> Foo for T {
     fn foo(&self) -> usize {
         mem::size_of::<T>()
diff --git a/tests/ui/stdlib-unit-tests/raw-fat-ptr.stderr b/tests/ui/stdlib-unit-tests/raw-fat-ptr.stderr
new file mode 100644
index 00000000000..670fa5bb922
--- /dev/null
+++ b/tests/ui/stdlib-unit-tests/raw-fat-ptr.stderr
@@ -0,0 +1,12 @@
+warning: method `foo` is never used
+  --> $DIR/raw-fat-ptr.rs:35:16
+   |
+LL | trait Foo { fn foo(&self) -> usize; }
+   |       ---      ^^^
+   |       |
+   |       method in this trait
+   |
+   = note: `#[warn(dead_code)]` on by default
+
+warning: 1 warning emitted
+