This is the revision history for $a in <freenode.net:#perlbot>

factoid_idsubjectcopulapredicateauthornamespace
15626 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see https://metacpan.org/pod/Perl::Critic::Policy::Community::DollarAB ; consider using $x, $y instead. | https://perldoc.perl.org/variables/$a ilmari <*:##NULL>
15449 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see https://metacpan.org/pod/Perl::Critic::Policy::Freenode::DollarAB ; consider using $x, $y instead. | https://perldoc.perl.org/variables/$a grinnz <*:##NULL>
13589 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see https://metacpan.org/pod/Perl::Critic::Policy::Freenode::DollarAB ; consider using $x, $y instead. | https://perldoc.pl/variables/$a grinnz <*:##NULL>
12710 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see https://metacpan.org/pod/Perl::Critic::Policy::Freenode::DollarAB ; consider using $x, $y instead. pink_mist <*:##NULL>
11318 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see http://perl-begin.org/tutorials/bad-elements/#vars-a-and-b | consider $x, $y instead grinnz_ <*:##NULL>
11278 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see http://perl-begin.org/tutorials/bad-elements/#vars-a-and-b | consider $a, $b or $α, $β instead tm604 <*:##NULL>
10442 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. Please see http://perl-begin.org/tutorials/bad-elements/#vars-a-and-b pink_mist <*:##NULL>
10441 $a is Don't use $a or $b as variable names. Not even in examples. They are not normal variables and will not behave like normal variables. The only place they are cromulent is in a sort or List::Util block. pink_mist <*:##NULL>