support array destructuring on iterables - fixes #194

test/fixtures/transformation/destructuring/array/expected.js

@@ -2,7 +2,13 @@
 
 var _ref = ["hello", [", ", "junk"], ["world"]];
 
-var a = _ref[0];
-var b = _ref[1][0];
-var c = _ref[2][0];
-var d = _ref[3];
+var _ref2 = Array.from(_ref);
+
+var a = _ref2[0];
+var _ref3 = Array.from(_ref2[1]);
+
+var b = _ref3[0];
+var _ref4 = Array.from(_ref2[2]);
+
+var c = _ref4[0];
+var d = _ref2[3];