Watch yourself :)

use strict;
use warnings;
use vars "$varname", "@varname";
__END__
Possible unintended interpolation of @varname in string at - line 3.
Global symbol "$varname" requires explicit package name at - line 3.
Global symbol "@varname" requires explicit package name at - line 3.
BEGIN not safe after errors--compilation aborted at - line 3.
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