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type ex =
  | E : {
      module_ :
        (module S.Analyzer
           with type Expression.t = 'a
            and type Expression.t' = 'b
            and type Instruction.t = 'c
            and type Instruction.t' = 'd
            and type Location.t = 'e
            and type context = 'f);
      expr_witness : 'a Type.Id.t;
      expr' : 'b Type.Id.t;
      instr_witness : 'c Type.Id.t;
      instr' : 'd Type.Id.t;
      location_witness : 'e Type.Id.t;
      context : 'f Type.Id.t;
    }
      -> ex  (** Type of check to apply *)

let build :
    (module S.Analyzer
       with type Expression.t = _
        and type Expression.t' = _
        and type Instruction.t = _
        and type Instruction.t' = _
        and type Location.t = 'a
        and type context = _) ->
    'a Type.Id.t * ex =
 fun module_ ->
  let expr_witness = Type.Id.make ()
  and expr' = Type.Id.make ()
  and instr_witness = Type.Id.make ()
  and instr' = Type.Id.make ()
  and location_witness = Type.Id.make ()
  and context = Type.Id.make () in
  let t =
    E
      {
        module_;
        expr_witness;
        expr';
        instr_witness;
        instr';
        location_witness;
        context;
      }
  in
  (location_witness, t)