(W once) Typographical errors often show up as unique variable names.
    If you had a good reason for having a unique name, then just mention it
    again somehow to suppress the message.  The our declaration is
    provided for this purpose.
    (W unopened) An I/O operation was attempted on a filehandle that was
    never initialized.  You need to do an open() or a socket()
    call, or call a constructor from the FileHandle package.