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signature S = sig
con nm :: Name
con r :: {Type}
constraint [nm] ~ r
end
structure M : S = struct
con nm = #A
con r = [B = float, C = string]
constraint [A] ~ [B]
constraint [nm] ~ r
constraint [C] ~ [D]
end
structure M' = struct
open M
con combo = [nm = int] ++ r
end
structure M' = struct
open constraints M
con nm' = M.nm
con r' = M.r
con combo = [nm' = int] ++ r'
end
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