Castile / eg / linkedlist.castile

struct list {
  value: string;
  next: list|void;

fun empty() {
  return null as list|void

fun cons(v: string, l: list|void) {
  make list(value:v, next:l) as list|void

main = fun() {
  l = cons("first", cons("second", cons("third", empty())));

  h = l;
  next = empty();

   * Note that we cannot say "h =" in the following loop,
   * as inside the typecase, h has a different type from
   * So we do the next best thing.  (Pun not intended.)
  while true {
    typecase h is void { break; }
    typecase h is list {
      next =;
    h = next;
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