parsing break and continue statements

Hi, I am new to the PHP internals, and I was just looking through the code related to parsing break/continue statements. It looks that as of PHP 5.4, Zend/zend_language_parser.y accepts both "T_BREAK expr" and "T_CONTINUE expr" and check to make sure "expr" is a positive integer in the function zend_do_brk_cont. Doesn't it make more sense to replace "T_BREAK expr" with "T_BREAK <positive integer>" (the same goes for the continue statement)? Thanks in advance! kiyoto