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view tests/datatypeP2.ur @ 1168:69f1d39d3f2d

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Use COALESCE to hide NULL results of aggregate functions; fix bug with improper ordering of query result columns
author Adam Chlipala <adamc@hcoop.net>
date Thu, 25 Feb 2010 14:55:35 -0500
parents 71bafe66dbe1
children
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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>