Consider the code:

BEGIN {
  open(MESSAGES,'>msg.txt') or die "$!";
}
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Assuming that this is the only occurance of MESSAGES at the time of compilation, we get a warning that MESSAGES is used only once (i.e. the file is opened, but nothing is written to it). My question is: Is it possible to get rid of this warning by a means like "declaring" the filehandle, similar to how it can be done with variables by using our or use vars, i.e. somthing similar in spirit to

  use vars qw(MESSAGES); # wrong !!!!!!
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? Of course there are various workarounds, for example

• Put a END { close MESSAGES } into this module
• Use something like use vars '$msg'; $msg=IO::File(...)
• Write a null string to the file after opening
• Put a no warnings into the BEGIN block

Given these alternatives, my question is of more theoretical nature, but still one I'm interested in...

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