Description:
------------
A strange bug with references is present in today's snaphshot (10:30) of PHP 5.1.

I call it bug because many old PHP scripts don't work anymore.

The problem is that passing an argument to a function expecting a reference when this argument retreived by another function call, causes a Fatal Error.

With PHP 5.0.4 it works fine.

Reproduce code:
---------------
<?

function a (&$str) {
	echo 'hi';
}

function b ($str) {
	return $str . 'hi';
}

echo a (b('1'));


Expected result:
----------------
hi

Actual result:
--------------
Fatal error: Only variables can be passed by reference in C:\Program Files\Apache Group\...\test.php on line 11