Testing parsing of some special syntactically invalid arrow functions.

Author: iamstolis

graal-js/src/com.oracle.truffle.js.test/js/GR-37478.js

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2022, 2022, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Licensed under the Universal Permissive License v 1.0 as shown at http://oss.oracle.com/licenses/upl.
+ */
+
+load('assert.js');
+
+assertThrows(function() {
+    eval('+async()=>{}');
+}, SyntaxError);
+
+assertThrows(function() {
+    eval('async function f() { await async()=>{}; }');
+}, SyntaxError);