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signature ABSTRACT_MACHINE =
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sig
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datatype term = Var of int | Const of int | App of term * term | Abs of term
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datatype pattern = PVar | PConst of int * (pattern list)
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datatype guard = Guard of term * term
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type program
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exception Compile of string;
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(* The de-Bruijn index 0 occurring on the right hand side refers to the LAST pattern variable, when traversing the pattern from left to right,
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1 to the second last, and so on. *)
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val compile : (guard list * pattern * term) list -> program
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val discard : program -> unit
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exception Run of string;
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val run : program -> term -> term
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end
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structure AbstractMachine : ABSTRACT_MACHINE =
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struct
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datatype term = Var of int | Const of int | App of term * term | Abs of term
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datatype pattern = PVar | PConst of int * (pattern list)
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datatype guard = Guard of term * term
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type program = unit
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exception Compile of string;
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fun compile _ = raise Compile "abstract machine stub"
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fun discard _ = raise Compile "abstract machine stub"
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exception Run of string;
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fun run p t = raise Run "abstract machine stub"
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end
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