ometa Repeat {
  repeat :n :rule = ?(n = 0)                             -> []
                  | ?(n > 0) apply(rule):x
                             apply(repeat(n-1, rule)):xs -> { xs[xs.length] = x;
                                                              xs },
  a   = 'a' Parse error Parse error Parse error Parse error Parse error Parse error Parse error Parse error Parse error -> -> -> -> -> -> -> -> ->,
  aaa = apply(repeat(3, a)) Parse error Parse error Parse error Parse error Parse error Parse error Parse error Parse error Parse error Parse error -> -> -> -> -> -> -> -> -> ->:xs -> xs.join()
}

Repeat.matchAll("aaaaaa", 'aaa')