Description:
------------
If the eval'ed code ends with a comment which is not termiated 
by a newline, eval hangs in an endless loop. If the comment is 
followed by a newline, there is no hang.

This causes phpBB2 on php 5.1 to hang.

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

$v='echo "Test\n"; // comment';
$w=$v."\n";

echo "Eval 1:";
eval ($w);
echo "Eval 2:";
eval ($v);
?>


Expected result:
----------------
The code sample returns after printing:

Eval 1:Test
Eval 2:Test

Actual result:
--------------
The code hangs after:

Eval 1:Test
Eval 2: