[perl #56530] <variable> used only once: possible typo

[Toralf Förster (via RT) <perlbug-followup@perl.org>]

# New Ticket Created by  Toralf Förster 
# Please include the string:  [perl #56530]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=56530 >


The following one-liner shouldn't produce that warning, isn't it ? :

tfoerste@n22 ~ $ seq 1 7 | perl -we 'while (<STDIN>) { print "line break\n" if ($counter++ % 3 == 0); print }'
Name "main::counter" used only once: possible typo at -e line 1.
line break
1
2
3
line break
4
5
6
line break
7
tfoerste@n22 ~ $ perl -v

This is perl, v5.8.8 built for i686-linux

Copyright 1987-2006, Larry Wall

-- 
MfG/Sincerely

Toralf Förster
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