view tests/pprint.ur @ 1770:53d56d87fbd2

More manual detail on registering error handlers
author Adam Chlipala <adam@chlipala.net>
date Sat, 19 May 2012 11:38:14 -0400
parents 318ba997a149
children
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fun isNone [a] (x : option a) =
    case x of
        None => True
      | Some _ => False