1function Any(x, y) {
2  return prec.right(choice(seq(optional(x), y), x));
3}
4
5function Qualify(...names) {
6  const qualified = [
7    ...names,
8    ...names
9      .filter((s) => typeof s == "string" && keywords.includes(s))
10      .map((name) => alias(`Core$${name}`, name)),
11  ];
12  return qualified.length === 1 ? qualified[0] : choice(...qualified);
13}
14
15function fieldExpr($, name) {
16  return field(name, $.expression);
17}