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Weakening-type coercions for SQL values
author Adam Chlipala <adamc@hcoop.net>
date Sun, 13 Dec 2009 13:00:55 -0500
parents 71bafe66dbe1
children
rev   line source
adamc@35 1 signature S1 = sig
adamc@34 2 type t
adamc@34 3 val zero : t
adamc@34 4 end
adamc@35 5 signature S2 = sig
adamc@35 6 type t = int
adamc@35 7 val zero : t
adamc@35 8 end
adamc@35 9 structure S = struct
adamc@34 10 type t = int
adamc@34 11 val zero = 0
adamc@34 12 end
adamc@35 13 structure S1 : S1 = S
adamc@35 14 structure S2 : S2 = S
adamc@34 15
adamc@35 16 type t = S1.t
adamc@35 17 val zero : t = S1.zero
adamc@35 18
adamc@35 19 type t = S2.t
adamc@35 20 val zero : int = S2.zero
adamc@35 21
adamc@35 22 structure T = S1
adamc@39 23 val main : S1.t = T.zero