Ran something like this:
```
function f() {
throw new Exception("ABCDEF");
}
f("a", 1, null, false, (object)array(), array(), new PhutilJSON());
```
...and got this stack trace:
```
>>> orbital ~/devtools/libphutil $ ./scripts/test/prompt.php
[2014-06-14 19:14:45] EXCEPTION: (Exception) ABCDEF at [<phutil>/scripts/test/prompt.php:8]
#0 f(string, integer, NULL, boolean, stdClass, array, PhutilJSON) called at [<phutil>/scripts/test/prompt.php:11]
```