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annotate tests/cancel.ur @ 1886:b7cd3c7c7edd

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Interpret 'table' signature items more flexibly, automatically adding (Ur) constraints to support a kind of subtyping over (SQL) constraint sets
author Adam Chlipala <adam@chlipala.net>
date Mon, 04 Nov 2013 15:14:23 -0500
parents dfb38a333816
children
rev   line source
adam@1582 1 type t = {A : int, B : float, C : string}
adam@1582 2 type u = {A : int, C : string, D : bool}
adam@1582 3
adam@1582 4 fun f (x : t) = x
adam@1582 5 fun g (x : u) = f x
adam@1582 6
adam@1582 7 fun h [ts] [ts ~ [A]] (r : $([A = int] ++ ts)) : $([A = int, B = float] ++ ts) = r