That's wrong. The ones that have to be declared are the ones not in perlvar. For example, $^W does not have to be declared, but perl -e "$,=$\=$/; print keys %::" does not print it.

Update: the exact rule is in perlvar:

Perl identifiers that begin with digits, control characters, or punctuation characters are exempt from the effects of the "package" declaration and are always forced to be in package "main"; they are also exempt from "strict 'vars'" errors. A few other names are also exempt in these ways: ENV STDIN INC STDOUT ARGV STDERR ARGVOUT _ SIG

In reply to Re^2: Use of $AUTOLOAD and strict by ambrus
in thread Use of $AUTOLOAD and strict by jira0004

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