tag t {
  a;
  b(str);
}

fn make(int i) -> t {
  if (i > 10) {
    ret a;
  }
  auto s = "hello";
  // Ensure s is non-const.
  s += "there";
  ret b(s);
}

fn main() {
  auto i = 0;
  // The auto slot for the result of make(i) should not leak.
  while (make(i) != a) {
    i += 1;
  }
}