BEGIN {
    require ab;
}

$a::variable;
&b::subroutine;

##</code><code>##

BEGIN {
    require ab;
    import a qw( $var sub );
    import b qw( sub2 sub3);
}

##</code><code>##

use a qw( $var2 &sub );

BEGIN {
    import b qw( $foo %bar );
}