id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc
769,disallow variables that differ only in sigils,szabgab,,"In beginner mode disallow $x if @x is already in use.

Idea from gaal in a comment 
http://blog.woobling.org/2009/11/restricted-perl.html

Before implementing, please check if there is no Perl::Critic rule for this!",enhancement,new,major,,editor,0.50,,usability,