new file mode 100644
--- /dev/null
+++ b/js/src/tests/ecma_7/AsyncFunctions/constructor.js
@@ -0,0 +1,40 @@
+var BUGNUMBER = 1185106;
+var summary = "async function constructor and prototype";
+
+print(BUGNUMBER + ": " + summary);
+
+var test = `
+
+var f1 = async function() {};
+
+var AsyncFunction = f1.constructor;
+var AsyncFunctionPrototype = AsyncFunction.prototype;
+
+assertEq(AsyncFunction.name, "AsyncFunction");
+assertEq(AsyncFunction.length, 1);
+assertEq(Object.getPrototypeOf(async function() {}), AsyncFunctionPrototype);
+
+assertEq(AsyncFunctionPrototype.constructor, AsyncFunction);
+
+var f2 = AsyncFunction("await 1");
+assertEq(f2.constructor, AsyncFunction);
+assertEq(f2.length, 0);
+assertEq(Object.getPrototypeOf(f2), AsyncFunctionPrototype);
+
+var f3 = new AsyncFunction("await 1");
+assertEq(f3.constructor, AsyncFunction);
+assertEq(f3.length, 0);
+assertEq(Object.getPrototypeOf(f3), AsyncFunctionPrototype);
+
+var f4 = AsyncFunction("a", "b", "c", "await 1");
+assertEq(f4.constructor, AsyncFunction);
+assertEq(f4.length, 3);
+assertEq(Object.getPrototypeOf(f4), AsyncFunctionPrototype);
+
+`;
+
+if (asyncFunctionsEnabled())
+    eval(test);
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);