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diff lib/ur/option.ur @ 841:44c2c089ca15

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Start of Option; Basis.current; fix missed cases in Jscomp.isNullable
author Adam Chlipala <adamc@hcoop.net>
date Sun, 07 Jun 2009 11:13:18 -0400
parents
children 74a1e3bdf430
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/ur/option.ur	Sun Jun 07 11:13:18 2009 -0400
@@ -0,0 +1,6 @@
+datatype t = datatype Basis.option
+
+fun isSome [a] x =
+    case x of
+        None => False
+      | Some _ => True