add traceur test suite

test/fixtures/traceur/Destructuring/ForInLoop.js

@@ -0,0 +1,28 @@
+// Options: --block-binding
+
+var object = {
+  abc: 0,  // Keep all the keys at length 3.
+  def: 1
+};
+
+var expectedHeads = ['a', 'd'];
+var expectedTails = [['b', 'c'], ['e','f']];
+var i = 0;
+for (var [head, ...tail] in object) {
+  assert.equal(expectedHeads[i], head);
+  assertArrayEquals(expectedTails[i], tail);
+  i++;
+}
+assert.equal(2, i);
+
+{
+  let x = 42;
+  for (let {length: x} in object) {
+    assert.equal(3, x);
+  }
+  assert.equal(42, x);
+}
+
+var k;
+for ({length: k} in {abc: 3})  // No block
+  assert.equal(3, k);