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Catch UnboundNamed exceptions that arise from missing signature items
author Adam Chlipala <adam@chlipala.net>
date Fri, 21 Oct 2011 08:51:30 -0400
parents 217eb87dde31
children
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fun other () = redirect (bless "http://www.google.com/")

fun further () = case checkUrl "http://www.google.com/" of
                     None => return <xml>Darn.</xml>
                   | Some url => redirect url

fun failing () = case checkUrl "http://www.yahoo.com/" of
                     None => return <xml>Darn.</xml>
                   | Some url => redirect url

fun main () = return <xml><body>
  <a link={other ()}>Go there</a><br/>
  <a link={further ()}>Go also there</a><br/>
  <a link={failing ()}>Fail there</a>
</body></xml>