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       vars - Perl pragma to predeclare global variable names


           use vars qw($frob @mung %seen);


       NOTE: For use with variables in the current package for a single scope, the functionality
       provided by this pragma has been superseded by "our" declarations, available in Perl
       v5.6.0 or later, and use of this pragma is discouraged.  See "our" in perlfunc.

       This will predeclare all the variables whose names are in the list, allowing you to use
       them under "use strict", and disabling any typo warnings.

       Unlike pragmas that affect the $^H hints variable, the "use vars" and "use subs"
       declarations are not BLOCK-scoped.  They are thus effective for the entire file in which
       they appear.  You may not rescind such declarations with "no vars" or "no subs".

       Packages such as the AutoLoader and SelfLoader that delay loading of subroutines within
       packages can create problems with package lexicals defined using "my()". While the vars
       pragma cannot duplicate the effect of package lexicals (total transparency outside of the
       package), it can act as an acceptable substitute by pre-declaring global symbols, ensuring
       their availability to the later-loaded routines.

       See "Pragmatic Modules" in perlmodlib.