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More diagnostic information about some type class resolution failures
author Adam Chlipala <adam@chlipala.net>
date Fri, 04 May 2012 10:33:04 -0400
parents f0224c7f12bb
children
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table t : { Chan : option (channel unit) }

fun main () : transaction page =
    ch <- channel;
    dml (INSERT INTO t (Chan) VALUES ({[Some ch]}));
    return <xml><body>Did it.</body></xml>