Mercurial > urweb

datatype sum a b = Left of a | Right of b

val l : sum int string = Left 5
val r : sum int string = Right "Hi"

val show = fn x : sum int string => case x of Left _ => "Left _" | Right s => s

val page = fn x => <html><body>
        {cdata (show x)}
</body></html>

val main : unit -> page = fn () => <html><body>
        <li><a link={page l}>Left</a></li>
        <li><a link={page r}>Right</a></li>
</body></html>
author	Adam Chlipala <adam@chlipala.net>
date	Wed, 16 Jul 2014 04:06:11 -0400
parents	71bafe66dbe1
children