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view lib/ur/option.ur @ 842:d1b6acaec265

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&& and ||
author Adam Chlipala <adamc@hcoop.net>
date Sun, 07 Jun 2009 12:01:55 -0400
parents 44c2c089ca15
children 74a1e3bdf430
line wrap: on
line source
datatype t = datatype Basis.option

fun isSome [a] x =
    case x of
        None => False
      | Some _ => True