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while (1) { ... next if () ... last }

 LINE: {
        chomp($row = <$fh>) or last LINE;
        redo LINE if $key < $min;
        $done = 1 && return if ($key > $max);
      }

sub itter_maker {  # return a function that passes back data allowed b
+y the given predicate subroutine
  my $predicate = shift; #CODE ref
...
      return;
    });
}