Mercurial > urweb

view tests/datatypeP2.ur @ 1553:4105f779de7b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Even gentler handling of back-button returns to pages with stale message-passing credentials
author Adam Chlipala <adam@chlipala.net>
date Sun, 28 Aug 2011 19:32:20 -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>