diff --git a/tests/ui/is_unit_expr.stderr b/tests/ui/is_unit_expr.stderr
index e69de29bb2d..c6e2c3aaf7b 100644
--- a/tests/ui/is_unit_expr.stderr
+++ b/tests/ui/is_unit_expr.stderr
@@ -0,0 +1,16 @@
+error: unknown lint: `unit_expr`
+ --> $DIR/is_unit_expr.rs:4:8
+  |
+4 | #[warn(unit_expr)]
+  |        ^^^^^^^^^
+  |
+  = note: `-D unknown-lints` implied by `-D warnings`
+
+error: unknown lint: `no_effect`
+ --> $DIR/is_unit_expr.rs:6:9
+  |
+6 | #[allow(no_effect)]
+  |         ^^^^^^^^^
+
+error: aborting due to 2 previous errors
+