| This test checks whether various forms of preincrement expression are allowed. |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
| PASS ++(window["x"]) is 6 |
| PASS ++((window["x"])) is 10 |
| PASS ++(y, x) threw exception ReferenceError: Prefix ++ operator applied to value that is not a reference.. |
| PASS ++(true ? x : y) threw exception ReferenceError: Prefix ++ operator applied to value that is not a reference.. |
| PASS ++++x threw exception ReferenceError: Prefix ++ operator applied to value that is not a reference.. |
| PASS successfullyParsed is true |