view tests/case.ur @ 2062:795b5b75453c

Add 'role' data attribute. Note, that 'role' attribute is a part of reach ARIA API described here: http://www.w3.org/TR/wai-aria/ Among 'role', it defines lots of aria-* attributes
author Sergey Mironov <grrwlf@gmail.com>
date Mon, 07 Jul 2014 10:05:04 +0400
parents 71bafe66dbe1
children
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datatype t = A | B

val swap = fn x : t => case x of A => B | B => A

datatype u = C of t | D

val out = fn x : u => case x of C y => y | D => A

datatype nat = O | S of nat

val is_two = fn x : nat =>
        case x of S (S O) => A | _ => B

val zero_is_two = is_two O
val one_is_two = is_two (S O)
val two_is_two = is_two (S (S O))