In my tests of how intersection works, it will return an associative array when the first array is associative and the second is sequential. It will also treat a variable name as a constant name if there is no variable by that name and there is a constant by that name. So, what I thought were problems with the code might not be.
If the purpose of these intersections is to weed out empty spaces, the same thing can be accomplished more easily with diff noupper @ or diff nolower @.
I notice that your calls to stalemated include two arguments, but only one parameter is defined for the subroutine.
In my tests of how intersection works, it will return an associative array when the first array is associative and the second is sequential. It will also treat a variable name as a constant name if there is no variable by that name and there is a constant by that name. So, what I thought were problems with the code might not be.
If the purpose of these intersections is to weed out empty spaces, the same thing can be accomplished more easily with diff noupper @ or diff nolower @.
I notice that your calls to stalemated include two arguments, but only one parameter is defined for the subroutine.