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Add printer for Env.t for debugging #180

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Add printer for Env.t for debugging #180

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5 changes: 4 additions & 1 deletion src/core/Env.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,8 @@ let empty () =

let create ~anchor = {anchor; next = first_var}

let pp ppf env = Format.fprintf ppf "ENV(%d)" env.anchor

let fresh ~scope e =
let v = Obj.magic (Term.Var.make ~env:e.anchor ~scope e.next) in
e.next <- 1 + e.next;
Expand All @@ -37,7 +39,8 @@ let fresh ~scope e =
let check env v = (v.Term.Var.env = env.anchor)

let check_exn env v =
if check env v then () else failwith "OCanren fatal (Env.check): wrong environment"
if check env v then ()
else failwith "OCanren fatal (Env.check): wrong environment"

let var env x =
match Term.var x with
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2 changes: 2 additions & 0 deletions src/core/Env.mli
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Expand Up @@ -28,6 +28,8 @@ type t
the variable index introduced last. That's why {!empty} has extra unit argument. *)
val empty : unit -> t

val pp : Format.formatter -> t -> unit

val create : anchor:Term.Var.env -> t

(** Creating a fresh variable takes an extra argument [scope] to decide if
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