From my experience, using state in a named subroutine is a code smell. Sooner or later, you'll need to call the same subroutine for a different purpose, and you'll need a way to reinitialize the state variable with a different value. I usually use two closures over the same my variable, one of them being the setter. 
my $state;
sub init_state { $state = shift }
sub foo {
    if ($state) {
        ...

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Where state makes sense, in my opinion, is in anonymous subs, because an anonymous sub has a defined life span: 

for my $i (1 .. 3) {
    my $s = sub { state $x = $_; say "$i $x" };
    $s->($_) for qw( a b );
}

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($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re^2: Variable scope by choroba
in thread Variable scope by Alphaphi

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