1 files changed, 83 insertions, 0 deletions
diff --git a/js/src/tests/non262/async-functions/syntax.js b/js/src/tests/non262/async-functions/syntax.js
new file mode 100644
index 0000000000..a5ec254e2e
--- /dev/null
+++ b/js/src/tests/non262/async-functions/syntax.js
@@ -0,0 +1,83 @@
+var BUGNUMBER = 1185106;
+var summary = "async/await syntax";
+
+print(BUGNUMBER + ": " + summary);
+
+if (typeof Reflect !== "undefined" && Reflect.parse) {
+    assertEq(Reflect.parse("function a() {}").body[0].async, false);
+    assertEq(Reflect.parse("function* a() {}").body[0].async, false);
+    assertEq(Reflect.parse("async function a() {}").body[0].async, true);
+    assertEq(Reflect.parse("() => {}").body[0].async, undefined);
+
+    // No line terminator after async
+    assertEq(Reflect.parse("async\nfunction a(){}").body[0].expression.name, "async");
+
+    // Async function expressions
+    assertEq(Reflect.parse("(async function() {})()").body[0].expression.callee.async, true);
+    assertEq(Reflect.parse("var k = async function() {}").body[0].declarations[0].init.async, true);
+    assertEq(Reflect.parse("var nmd = async function named() {}").body[0].declarations[0].init.id.name, "named");
+
+    // `await` handling for function declaration name inherits.
+    assertEq(Reflect.parse("async function await() {}").body[0].id.name, "await");
+    assertThrowsInstanceOf(() => Reflect.parse("async function f() { async function await() {} }"), SyntaxError);
+
+    // `await` is not allowed in function expression name.
+    assertThrowsInstanceOf(() => Reflect.parse("(async function await() {})"), SyntaxError);
+
+    // Awaiting not directly inside an async function is not allowed
+    assertThrowsInstanceOf(() => Reflect.parse("await 4;"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("function a() { await 4; }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("function* a() { await 4; }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function k() { function a() { await 4; } }"), SyntaxError);
+
+    // Await is not allowed as a default expr.
+    assertThrowsInstanceOf(() => Reflect.parse("async function a(k = await 3) {}"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b(k = await 3) {} }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b(k = [await 3]) {} }"), SyntaxError);
+
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b([k = await 3]) {} }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b([k = [await 3]]) {} }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b({k = await 3}) {} }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { async function b({k = [await 3]}) {} }"), SyntaxError);
+
+    // Await is not legal as an identifier in an async function.
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { var await = 4; }"), SyntaxError);
+    assertThrowsInstanceOf(() => Reflect.parse("async function a() { return await; }"), SyntaxError);
+
+    // Await is still available as an identifier name in strict mode code.
+    Reflect.parse("function a() { 'use strict'; var await = 3; }");
+    Reflect.parse("'use strict'; var await = 3;");
+
+    // Await is treated differently depending on context. Various cases.
+    Reflect.parse("var await = 3; async function a() { await 4; }");
+    Reflect.parse("async function a() { await 4; } var await = 5");
+    Reflect.parse("async function a() { function b() { return await; } }");
+
+    Reflect.parse("async function a() { var k = { async: 4 } }");
+
+    Reflect.parse("function a() { await: 4 }");
+
+    assertEq(Reflect.parse("async function a() { await 4; }")
+        .body[0].body.body[0].expression.operator, "await");
+
+    assertEq(Reflect.parse("async function a() { async function b() { await 4; } }")
+        .body[0].body.body[0].body.body[0].expression.operator, "await");
+
+    // operator priority test
+    assertEq(Reflect.parse("async function a() { await 2 + 3; }")
+        .body[0].body.body[0].expression.left.argument.value, 2);
+    assertEq(Reflect.parse("async function a() { await 2 + 3; }")
+        .body[0].body.body[0].expression.left.operator, "await");
+    assertEq(Reflect.parse("async function a() { await 2 + 3; }")
+        .body[0].body.body[0].expression.right.value, 3);
+
+    // blocks and other constructions
+    assertEq(Reflect.parse("{ async function a() { return 2; } }")
+        .body[0].body[0].async, true);
+
+    // Async function expression is primary expression.
+    Reflect.parse("(async function a() {}.constructor)");
+}
+
+if (typeof reportCompare === "function")
+    reportCompare(true, true);