Mercurial > urweb

view tests/datatypeP2.ur @ 837:ccf22c2c77b2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Tweak -- precedence; use right env for final exhaustiveness errors
author Adam Chlipala <adamc@hcoop.net>
date Tue, 02 Jun 2009 15:43:18 -0400
parents 71bafe66dbe1
children
line wrap: on
line source
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>