diff --git a/src/lib/reasoners/fun_sat.ml b/src/lib/reasoners/fun_sat.ml
index 347ef6cc4..ecb2c6cb0 100644
--- a/src/lib/reasoners/fun_sat.ml
+++ b/src/lib/reasoners/fun_sat.ml
@@ -1874,7 +1874,6 @@ module Make (Th : Theory.S) = struct
     Steps.reinit_steps ();
     clear_instances_cache ();
     Th.reinit_cpt ();
-    Symbols.clear_labels ();
     Id.Namespace.reinit ();
     Var.reinit_cnt ();
     Satml_types.Flat_Formula.reinit_cpt ();
diff --git a/src/lib/reasoners/satml_frontend.ml b/src/lib/reasoners/satml_frontend.ml
index c0b448983..f728b7399 100644
--- a/src/lib/reasoners/satml_frontend.ml
+++ b/src/lib/reasoners/satml_frontend.ml
@@ -1415,7 +1415,6 @@ module Make (Th : Theory.S) : Sat_solver_sig.S = struct
     Steps.reinit_steps ();
     Th.reinit_cpt ();
     Id.Namespace.reinit ();
-    Symbols.clear_labels ();
     Var.reinit_cnt ();
     Objective.Function.reinit_cnt ();
     Satml_types.Flat_Formula.reinit_cpt ();
diff --git a/src/lib/structures/expr.ml b/src/lib/structures/expr.ml
index 7945afddd..52c5bca3c 100644
--- a/src/lib/structures/expr.ml
+++ b/src/lib/structures/expr.ml
@@ -850,11 +850,7 @@ let add_label =
     | _ ->
       add_aux lbl e
 
-let label t =
-  try Labels.find labels t
-  with Not_found ->
-    let { f = f; _ } = t in
-    Sy.label f
+let label t = Labels.find labels t
 
 let print_tagged_classes =
   let is_labeled t = not (Hstring.equal (label t) Hstring.empty) in
diff --git a/src/lib/structures/symbols.ml b/src/lib/structures/symbols.ml
index 87e47fb45..b79a7e332 100644
--- a/src/lib/structures/symbols.ml
+++ b/src/lib/structures/symbols.ml
@@ -534,20 +534,6 @@ let fresh_skolem_var base = Var.of_string (fresh_skolem_string base)
 let is_get f = equal f (Op Get)
 let is_set f = equal f (Op Set)
 
-module Labels = Hashtbl.Make(struct
-    type nonrec t = t
-    let equal = equal
-    let hash = hash
-  end)
-
-let labels = Labels.create 107
-
-let add_label lbl t = Labels.replace labels t lbl
-
-let label t = try Labels.find labels t with Not_found -> Hstring.empty
-
-let clear_labels () = Labels.clear labels
-
 module Set : Set.S with type elt = t =
   Set.Make (struct type nonrec t = t let compare=compare end)
 
diff --git a/src/lib/structures/symbols.mli b/src/lib/structures/symbols.mli
index eb93fb3e7..da4d90ede 100644
--- a/src/lib/structures/symbols.mli
+++ b/src/lib/structures/symbols.mli
@@ -225,13 +225,9 @@ val fresh_skolem_name : string -> t
 val is_get : t -> bool
 val is_set : t -> bool
 
-val add_label : Hstring.t -> t -> unit
-val label : t -> Hstring.t
-
 val print_bound : Format.formatter -> bound -> unit
 val string_of_bound : bound -> string
 
-val clear_labels : unit -> unit
 (** Empties the labels Hashtable *)
 
 module Set : Set.S with type elt = t
diff --git a/src/lib/structures/xliteral.ml b/src/lib/structures/xliteral.ml
index b108422c2..936367be4 100644
--- a/src/lib/structures/xliteral.ml
+++ b/src/lib/structures/xliteral.ml
@@ -74,9 +74,6 @@ module type S = sig
 
   val neg : t -> t
 
-  val add_label : Hstring.t -> t -> unit
-  val label : t -> Hstring.t
-
   val print : Format.formatter -> t -> unit
 
   val compare : t -> t -> int
@@ -94,53 +91,51 @@ module type S = sig
 
 end
 
-let print_view ?(lbl="") pr_elt fmt vw =
+let print_view pp_elt ppf vw =
   match vw with
   | Eq (z1, z2) ->
-    Format.fprintf fmt "%s %a = %a" lbl pr_elt z1 pr_elt z2
+    Fmt.pf ppf "%a =@ %a" pp_elt z1 pp_elt z2
 
-  | Distinct (b,(z::l)) ->
-    let b = if b then "~ " else "" in
-    Format.fprintf fmt "%s %s%a" lbl b pr_elt z;
-    List.iter (fun x -> Format.fprintf fmt " <> %a" pr_elt x) l
+  | Distinct (b, l) ->
+    Fmt.pf ppf "%s%a"
+      (if b then "~" else "")
+      Fmt.(list ~sep:(any " <> ") pp_elt) l
 
-  | Builtin (true, LE, [v1;v2]) ->
-    Format.fprintf fmt "%s %a <= %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (true, LE, [v1; v2]) ->
+    Fmt.pf ppf "%a <=@ %a" pp_elt v1 pp_elt v2
 
-  | Builtin (true, LT, [v1;v2]) ->
-    Format.fprintf fmt "%s %a < %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (true, LT, [v1; v2]) ->
+    Fmt.pf ppf "%a <@ %a" pp_elt v1 pp_elt v2
 
-  | Builtin (false, LE, [v1;v2]) ->
-    Format.fprintf fmt "%s %a > %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (false, LE, [v1; v2]) ->
+    Fmt.pf ppf "%a >@ %a" pp_elt v1 pp_elt v2
 
-  | Builtin (false, LT, [v1;v2]) ->
-    Format.fprintf fmt "%s %a >= %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (false, LT, [v1; v2]) ->
+    Fmt.pf ppf "%a >=@ %a" pp_elt v1 pp_elt v2
 
   | Builtin (_, (LE | LT), _) ->
     assert false (* not reachable *)
 
-  | Builtin (true, BVULE, [v1;v2]) ->
-    Format.fprintf fmt "%s %a <= %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (true, BVULE, [v1; v2]) ->
+    Fmt.pf ppf "%a <=@ %a" pp_elt v1 pp_elt v2
 
-  | Builtin (false, BVULE, [v1;v2]) ->
-    Format.fprintf fmt "%s %a > %a" lbl pr_elt v1 pr_elt v2
+  | Builtin (false, BVULE, [v1; v2]) ->
+    Fmt.pf ppf "%a >@ %a" pp_elt v1 pp_elt v2
 
   | Builtin (_, BVULE, _) ->
     assert false (* not reachable *)
 
   | Builtin (pos, IsConstr tcst, [e]) ->
-    Format.fprintf fmt "%s(%a ? %a)"
-      (if pos then "" else "not ") pr_elt e DE.Term.Const.print tcst
+    Fmt.pf ppf "%s(%a ?@ %a)"
+      (if pos then "" else "~")
+      pp_elt e
+      DE.Term.Const.print tcst
 
   | Builtin (_, IsConstr _, _) ->
     assert false (* not reachable *)
 
-  | Pred (p,b) ->
-    Format.fprintf fmt "%s %a = %s" lbl pr_elt p
-      (if b then "false" else "true")
-
-  | Distinct (_, _) -> assert false
-
+  | Pred (p, b) ->
+    Fmt.pf ppf "%s%a" (if b then "~" else "") pp_elt p
 
 module Make (X : OrderedType) : S with type elt = X.t = struct
 
@@ -179,18 +174,7 @@ module Make (X : OrderedType) : S with type elt = X.t = struct
   module Set = Set.Make(T)
   module Map = Map.Make(T)
 
-  module Labels = Hashtbl.Make(T)
-
-  let labels = Labels.create 100007
-
-  let add_label lbl t = Labels.replace labels t lbl
-
-  let label t = try Labels.find labels t with Not_found -> Hstring.empty
-
-  let print fmt a =
-    let lbl = Hstring.view (label a) in
-    let lbl = if String.length lbl = 0 then lbl else lbl^":" in
-    print_view ~lbl X.print fmt (view a)
+  let print ppf a = print_view X.print ppf (view a)
 
   let equal_builtins n1 n2 =
     match n1, n2 with
@@ -335,7 +319,6 @@ module Make (X : OrderedType) : S with type elt = X.t = struct
     HC.save_cache ()
 
   let reinit_cache () =
-    HC.reinit_cache ();
-    Labels.clear labels
+    HC.reinit_cache ()
 
 end
diff --git a/src/lib/structures/xliteral.mli b/src/lib/structures/xliteral.mli
index 8e7afe376..34fc05a94 100644
--- a/src/lib/structures/xliteral.mli
+++ b/src/lib/structures/xliteral.mli
@@ -75,9 +75,6 @@ module type S = sig
 
   val neg : t -> t
 
-  val add_label : Hstring.t -> t -> unit
-  val label : t -> Hstring.t
-
   val print : Format.formatter -> t -> unit
 
   val compare : t -> t -> int
@@ -96,11 +93,6 @@ module type S = sig
   module Set : Set.S with type elt = t
 end
 
-val print_view :
-  ?lbl:string ->
-  (Format.formatter -> 'a -> unit) ->
-  Format.formatter ->
-  'a view ->
-  unit
+val print_view : 'a Fmt.t -> 'a view Fmt.t
 
 module Make ( X : OrderedType ) : S with type elt = X.t