ref: 4d0895a4c80d5db3fe2c304b0820cb724d9ac0c3
dir: /test/matchunion_sl.myr/
use std /* checks pattern matching on unions with arguments. exits with 42. */ type u = union `Int int `Str byte[:] `Nil ;; const main = { var v v = `Str "foo" match v `Int 127: -> 42 ;; `Str s: std.put("%s\n", s) ;; `Nil: ;; ;; -> 0 }