Mercurial > urweb

annotate lib/ur/option.ur @ 843:9f0ea203a1ca

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
List.all; fix ANDALSO/ORELSE parsing precedence
author Adam Chlipala <adamc@hcoop.net>
date Sun, 07 Jun 2009 14:15:22 -0400
parents 44c2c089ca15
children 74a1e3bdf430
rev   line source
adamc@841 1 datatype t = datatype Basis.option
adamc@841 2
adamc@841 3 fun isSome [a] x =
adamc@841 4 case x of
adamc@841 5 None => False
adamc@841 6 | Some _ => True