ref: 9543bdfe516ddde6d347bffed6a99c9ec5c0c40b
dir: /test/matchunion.myr/
use std /* checks that union matching works, at least on the key. exits with 84. */ type u = union `Foo `Bar `Baz `Quux ;; const main = { var v v = `Foo match v | `Bar: std.exit(42) | `Baz: std.exit(81) | `Foo: std.exit(84) | `Quux: std.exit(123) ;; }