When sort calls 'byVersion' it sets up $a and $b as package global variables. So these variables are used more than once -- when they are being set and when they are being used.

If you add the line 

  use vars qw/$a $b/;
you 'declare' these variables as main package globals and you should get rid of the warning.

In reply to Re: Sort and related stuff by Tyke
in thread Sort and related stuff by leons

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