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structure ROOT =
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struct
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structure HOL =
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struct
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datatype boola = True | False;
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fun nota False = True
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| nota True = False;
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fun op_conj y True = y
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| op_conj x False = False
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| op_conj True ya = ya
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| op_conj False xa = False;
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end; (*struct HOL*)
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structure IntDef =
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struct
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datatype nat = Zero_nat | Succ_nat of nat;
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fun less_nat Zero_nat (Succ_nat n) = HOL.True
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| less_nat na Zero_nat = HOL.False
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| less_nat (Succ_nat m) (Succ_nat nb) = less_nat m nb;
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fun less_eq_nat m n = HOL.nota (less_nat n m);
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end; (*struct IntDef*)
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structure Codegen =
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struct
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fun in_interval (k, l) n =
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HOL.op_conj (IntDef.less_eq_nat k n) (IntDef.less_eq_nat n l);
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end; (*struct Codegen*)
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end; (*struct ROOT*)
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