view tests/pprint.ur @ 1790:56b8efff64e7

Nicer <active> semantics
author Adam Chlipala <adam@chlipala.net>
date Sun, 22 Jul 2012 09:42:17 -0400
parents 318ba997a149
children
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fun isNone [a] (x : option a) =
    case x of
        None => True
      | Some _ => False