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view tests/pprint.ur @ 2283:4afaab523213

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Initialize invalidation to NULL!
author Ziv Scully <ziv@mit.edu>
date Thu, 12 Nov 2015 10:06:07 -0500
parents 318ba997a149
children
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line source
fun isNone [a] (x : option a) =
    case x of
        None => True
      | Some _ => False