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diff lib/ur/option.urs @ 944:da3ec6014d2f

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Filters implementation type-checking
author Adam Chlipala <adamc@hcoop.net>
date Tue, 15 Sep 2009 15:48:53 -0400
parents 0d30e6338c65
children 8c37699de273
line wrap: on
line diff
--- a/lib/ur/option.urs	Tue Sep 15 13:07:57 2009 -0400
+++ b/lib/ur/option.urs	Tue Sep 15 15:48:53 2009 -0400
@@ -2,6 +2,7 @@
 
 val eq : a ::: Type -> eq a -> eq (t a)
 
+val isNone : a ::: Type -> t a -> bool
 val isSome : a ::: Type -> t a -> bool
 
 val mp : a ::: Type -> b ::: Type -> (a -> b) -> t a -> t b