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sub insert_after_first {
    return if @_ < 3;
...
             : insert_after_first( $elem, $new, @_ )
           );
}

sub insert_after_first {
    return if @_ < 3;
...
             : insert_after_first( $elem, @_ )
             );
}

sub insert_after_first {
    return if @_ < 3;
...
             : &insert_after_first
       );
}