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Allow SQL aggregation over nullable types
author Adam Chlipala <adam@chlipala.net>
date Tue, 21 Dec 2010 17:01:51 -0500
parents 4d519baf357c
children
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datatype list t = Nil | Cons of t * list t

val length : t ::: Type -> list t -> int

val rev : t ::: Type -> list t -> list t