diff --git a/compiler/main/hept2mls.ml b/compiler/main/hept2mls.ml
index 03b1b71..2361376 100644
--- a/compiler/main/hept2mls.ml
+++ b/compiler/main/hept2mls.ml
@@ -82,7 +82,7 @@ let rec translate_op = function
   | Heptagon.Eselect_trunc -> Eselect_trunc
   | Heptagon.Econcat -> Econcat
   | Heptagon.Earray -> Earray
-  | Heptagon.Etuple -> Etuple
+  | Heptagon.Etuple -> Misc.internal_error "hept2mls Etuple" 1
   | Heptagon.Earrow -> assert false
 
 let translate_app app =
diff --git a/compiler/main/mls2obc.ml b/compiler/main/mls2obc.ml
index a6dafa2..e46051b 100644
--- a/compiler/main/mls2obc.ml
+++ b/compiler/main/mls2obc.ml
@@ -218,7 +218,7 @@ let rec translate map e =
                                 |Minils.Eupdate|Minils.Eselect_dyn
                                 |Minils.Eselect_trunc|Minils.Eselect_slice
                                 |Minils.Earray_fill|Minils.Efield_update
-                                |Minils.Eifthenelse|Minils.Etuple)}, _, _) ->
+                                |Minils.Eifthenelse)}, _, _) ->
         internal_error "mls2obc" 5
   in
     mk_exp e.Minils.e_ty desc
diff --git a/compiler/minils/analysis/clocking.ml b/compiler/minils/analysis/clocking.ml
index 2b25832..cf84242 100644
--- a/compiler/minils/analysis/clocking.ml
+++ b/compiler/minils/analysis/clocking.ml
@@ -84,8 +84,6 @@ and typing_op op e_list h e ck = match op with
   | (Eequal | Efun _ | Enode _) -> (*LA*)
       List.iter (fun e -> expect h (skeleton ck e.w_ty) e) e_list;
       skeleton ck e.e_ty
-  | Etuple ->
-      Cprod (List.map (typing_extvalue h) e_list)
   | Eifthenelse ->
       let e1, e2, e3 = assert_3 e_list in
       let ct = skeleton ck e.e_ty
diff --git a/compiler/minils/minils.ml b/compiler/minils/minils.ml
index e24fe85..a831c3a 100644
--- a/compiler/minils/minils.ml
+++ b/compiler/minils/minils.ml
@@ -19,7 +19,7 @@ open Clocks
 
 (** Warning: Whenever Minils ast is modified,
     minils_format_version should be incremented. *)
-let minils_format_version = "1"
+let minils_format_version = "2"
 
 type iterator_type =
   | Imap
@@ -78,7 +78,6 @@ and app = { a_op: op; a_params: static_exp list; a_unsafe: bool }
 
 and op =
   | Eequal             (** arg1 = arg2 *)
-  | Etuple             (** (args) *)
   | Efun of fun_name   (** "Stateless" longname <<a_params>> (args) reset r *)
   | Enode of fun_name  (** "Stateful" longname <<a_params>> (args) reset r *)
   | Eifthenelse        (** if arg1 then arg2 else arg3 *)
@@ -183,9 +182,3 @@ let mk_const_dec id ty e loc =
 let mk_app ?(params=[]) ?(unsafe=false) op =
   { a_op = op; a_params = params; a_unsafe = unsafe }
 
-(** The modname field has to be set when known, TODO LG : format_version *)
-let mk_program o n t c =
-  { p_modname = Module ""; p_format_version = "";
-    p_opened = o; p_nodes = n; p_types = t; p_consts = c }
-
-let void = mk_exp (Types.Tprod []) (Eapp (mk_app Etuple, [], None))
diff --git a/compiler/minils/mls_printer.ml b/compiler/minils/mls_printer.ml
index 7b610c5..0a92b9a 100644
--- a/compiler/minils/mls_printer.ml
+++ b/compiler/minils/mls_printer.ml
@@ -130,7 +130,6 @@ and print_app ff (app, args) =
     | Eequal ->
       let e1, e2 = assert_2 args in
         fprintf ff "@[<2>%a@ = %a@]" print_extvalue e1  print_extvalue e2
-    | Etuple -> print_w_tuple ff args
     | Efun f | Enode f ->
         fprintf ff "@[%a@,%a@,%a@]"
           print_qualname f print_params app.a_params  print_w_tuple args
diff --git a/compiler/minils/mls_utils.ml b/compiler/minils/mls_utils.ml
index e5b4711..dde7852 100644
--- a/compiler/minils/mls_utils.ml
+++ b/compiler/minils/mls_utils.ml
@@ -13,7 +13,7 @@ open Misc
 (** Error Kind *)
 type err_kind = | Enot_static_exp
 
-let err_message ?(exp=void) ?(loc=exp.e_loc) = function
+let err_message exp ?(loc=exp.e_loc) = function
   | Enot_static_exp ->
       Format.eprintf "%aThe expression %a should be a static_exp.@."
         print_location loc
@@ -24,8 +24,8 @@ let rec static_exp_of_exp e =
   match e.e_desc with
     | Eextvalue w -> (match w.w_desc with
       | Wconst se -> se
-      | _ -> err_message ~exp:e Enot_static_exp)
-    | _ -> err_message ~exp:e Enot_static_exp
+      | _ -> err_message e Enot_static_exp)
+    | _ -> err_message e Enot_static_exp
 
 (** @return the list of bounds of an array type*)
 let rec bounds_list ty =