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signature S1 = sig
type t
val zero : t
end
signature S2 = sig
type t = int
val zero : t
end
structure S = struct
type t = int
val zero = 0
end
structure S1 : S1 = S
structure S2 : S2 = S
type t = S1.t
val zero : t = S1.zero
type t = S2.t
val zero : int = S2.zero
structure T = S1
val main : S1.t = T.zero
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