ref: 4ece888b582d2cb2b9e74cdebcede99a57b55e07 dir: /test/matchunion.myr/
type u = union `Foo `Bar `Baz `Quux ;; const main = { var v v = `Foo match v `Bar: -> 42 ;; `Baz: -> 81 ;; `Foo: -> 84 ;; `Quux: -> 123 ;; ;; }