-xLEVEL

Expand conventional syntax constructions into equivalent ones that expose their internal operation. 

...

If LEVEL is at least 7, "if" statements will be translated into
equivalent expressions using "&&", "?:" and "do {}"; for instance

##</code><code>##

lanx@nc10-ubuntu:~$ perl -MO=Deparse,-x7 -e 'if($a){print $b}'
$a and do {
    print $b
};
-e syntax OK