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EXPRESSION for LIST;

printf "_=%s\n", $_ for $_ = 3;
$_-- > 0;

perl -wE ...

13:44 >perl -wE "printf qq[_=%s], $_ for $_ = 3; $_-- > 0;"
Useless use of numeric gt (>) in void context at -e line 1.
_=3
13:45 >