Without warnings:

Type of arg 1 to push must be array (not array slice) at test.pl line 
+4, near "];"
Execution of test.pl aborted due to compilation errors.
[download]

With warnings:

Useless use of push with no values at test.pl line 4.
Type of arg 1 to push must be array (not array slice) at test.pl line 
+4, near "];"
Execution of test.pl aborted due to compilation errors.
[download]

Not a ton of new information, but if you can't figure out what's wrong from the first error message, it might be of some help.

Those who know that they are profound strive for clarity. Those who
would like to seem profound to the crowd strive for obscurity.
            --Friedrich Nietzsche