dead_code_tests: add skip multiple lambda args test

src/dead_code_tests.rs

@@ -287,6 +287,16 @@ alive
     assert_eq!(results[0].binding.name.to_string(), "dead2");
 }
 
+#[test]
+fn skip_multiple_lambda_args() {
+    let results = run("
+# deadnix: skip
+dead1: dead2:
+alive
+    ");
+    assert_eq!(0, results.len());
+}
+
 #[test]
 fn shadowed_by_skip() {
     let nix = "