annotate tests/pprint.ur @ 2283:4afaab523213

Initialize invalidation to NULL!
author Ziv Scully <ziv@mit.edu>
date Thu, 12 Nov 2015 10:06:07 -0500
parents 318ba997a149
children
rev   line source
adam@1727 1 fun isNone [a] (x : option a) =
adam@1727 2 case x of
adam@1727 3 None => True
adam@1727 4 | Some _ => False