Description:
------------
A function cannot directly return a reference produced by another function without first assigning it to a tmp variable.
This is a specialization of bug 24687.  

Reproduce code:
---------------
function &getSomeReference()
{
  return getSomeOtherReference(); // Fails
}
function &getSomeReference()
{
  $tmp =& getSomeOtherReference(); // Works
  return $tmp;
}


Expected result:
----------------
It should work.

Actual result:
--------------
Fatal error: Only variables or references can be returned by reference