view tests/pprint.ur @ 2198:cf2abef213d8

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author Adam Chlipala <adam@chlipala.net>
date Sat, 05 Dec 2015 12:12:40 -0500
parents 318ba997a149
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fun isNone [a] (x : option a) =
    case x of
        None => True
      | Some _ => False