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In simplifying constructors for error messages, unfold constructor synonyms from modules
author Adam Chlipala <adam@chlipala.net>
date Wed, 02 May 2012 08:23:30 -0400
parents 318ba997a149
children
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line source
fun isNone [a] (x : option a) =
    case x of
        None => True
      | Some _ => False