[parser] don't report error for CoverInitializedNames in async arrow formals

test/mjsunit/harmony/async-await-basic.js

Index: test/mjsunit/harmony/async-await-basic.js
diff --git a/test/mjsunit/harmony/async-await-basic.js b/test/mjsunit/harmony/async-await-basic.js
index 40a2605177aee33d97c57f72a6cc31907a920ee5..f42b041aea9259d04add2765ebb324eea3382607 100644
--- a/test/mjsunit/harmony/async-await-basic.js
+++ b/test/mjsunit/harmony/async-await-basic.js
@@ -343,8 +343,17 @@ assertEquals("async function () {}", async function() {}.toString());
 assertEquals("async x => x", (async x => x).toString());
 assertEquals("async x => { return x }", (async x => { return x }).toString());
 class AsyncMethod { async foo() { } }
-assertEquals("async foo() { }", Function.prototype.toString.call(AsyncMethod.prototype.foo));
-assertEquals("async foo() { }", Function.prototype.toString.call({async foo() { }}.foo));
+assertEquals("async foo() { }",
+             Function.prototype.toString.call(AsyncMethod.prototype.foo));
+assertEquals("async foo() { }",
+             Function.prototype.toString.call({async foo() { }}.foo));
 
 // Async functions are not constructible
 assertThrows(() => class extends (async function() {}) {}, TypeError);
+
+// Regress v8:5148
+assertEqualsAsync("1", () => (async({ a = NaN }) => a)({ a: "1" }));
+assertEqualsAsync("10",
+                  () => (async(foo, { a = NaN }) => foo + a)("1", { a: "0" }));

[Dan Ehrenberg, 2016/06/24 17:30:41]

If you're writing tests for defaults, maybe let a: undefined to see that?

[caitp (gmail), 2016/06/24 18:05:40]

Done

+assertThrows(() => eval("async({ foo = 1 })"), SyntaxError);
+assertThrows(() => eval("async(a, { foo = 1 })"), SyntaxError);