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  DB<168> sub tst (&@) { my $cr=shift; print $cr->($_)," " for @_ }

  DB<169> use feature 'state'; tst {state $i++} 1..3 for 1..3
 => ""
0 1 2 0 1 2 0 1 2

  DB<173> use feature 'state'; map {state $i++; print "$i "} 1..3 for 
+1..3
 => ""
1 2 3 4 5 6 7 8 9

  DB<195> use feature 'state'; for (1..3) { $y=0;while (++(my $x)) { p
+rint " $x .";last if $y++>3 } }
 => ""
...
  DB<196> use feature 'state'; for (1..3) { $y=0;while (++(state $x)) 
+{ print " $x .";last if $y++>3 } }
 => ""
 1 . 2 . 3 . 4 . 5 . 6 . 7 . 8 . 9 . 10 . 11 . 12 . 13 . 14 . 15 .