diff --git a/rust/rust_test.go b/rust/rust_test.go
index 80f693e..fe55d5f 100644
--- a/rust/rust_test.go
+++ b/rust/rust_test.go
@@ -442,3 +442,10 @@
 	m.Output("libwaldo.dylib.so.bloaty.csv")
 	m.Output("stripped/libwaldo.dylib.so.bloaty.csv")
 }
+
+func assertString(t *testing.T, got, expected string) {
+	t.Helper()
+	if got != expected {
+		t.Errorf("expected %q got %q", expected, got)
+	}
+}