diff --git a/cachegrind/tests/ann-diff4b-aux/w.rs b/cachegrind/tests/ann-diff4b-aux/w.rs
new file mode 100644
index 000000000..4cb29ea38
--- /dev/null
+++ b/cachegrind/tests/ann-diff4b-aux/w.rs
@@ -0,0 +1,3 @@
+one
+two
+three