4 files changed, 14 insertions, 3 deletions
diff --git a/frontend/ast.ml b/frontend/ast.ml
index 4f8c860..ae11064 100644
--- a/frontend/ast.ml
+++ b/frontend/ast.ml
@@ -57,6 +57,7 @@ type expr =
     (* other *)
     | AST_if          of (expr ext) * (expr ext) * (expr ext)
     | AST_instance    of (id ext) * (expr ext list) * id
+    | AST_tuple       of expr ext list
 
 type var_def = bool * id * typ
 
diff --git a/frontend/ast_printer.ml b/frontend/ast_printer.ml
index 7ddcb67..ac30fe9 100644
--- a/frontend/ast_printer.ml
+++ b/frontend/ast_printer.ml
@@ -160,6 +160,10 @@ let rec print_expr fmt e =
         Format.fprintf fmt "%a(%a)"
           print_id i (print_list print_expr ", ") (List.map fst l)
 
+  | AST_tuple x ->
+      Format.fprintf fmt "(%a)"
+        (print_list print_expr ", ") (List.map fst x)
+
 
 (* equations *)
 
diff --git a/frontend/ast_util.ml b/frontend/ast_util.ml
index a7953ad..b3393a7 100644
--- a/frontend/ast_util.ml
+++ b/frontend/ast_util.ml
@@ -55,6 +55,7 @@ let rec extract_instances p e = match fst e with
     let (node, _) = find_node_decl p f in
     let args_x = List.map2 (fun id arg -> id, arg) node.args args in
     (f, id, node.body, args_x)::more
+  | AST_tuple x -> List.flatten (List.map (extract_instances p) x)
 
 (* Utility : find pre declarations in an expression *)
 
@@ -70,6 +71,7 @@ let rec extract_pre e = match fst e with
     extract_pre e1 @ extract_pre e2 @ extract_pre e3
   | AST_instance((f, _), args, id) ->
     List.flatten (List.map extract_pre args)
+  | AST_tuple x -> List.flatten (List.map extract_pre x)
   | AST_pre(e', n) ->
     (n, e')::(extract_pre e')
 
diff --git a/frontend/typing.ml b/frontend/typing.ml
index 07b3bcd..1545a38 100644
--- a/frontend/typing.ml
+++ b/frontend/typing.ml
@@ -13,8 +13,8 @@ type typ =
     | TReal
     | TEnum of string list
 
-let bool_true = "T"
-let bool_false = "F"
+let bool_true = "tt"
+let bool_false = "ff"
 let bool_type = TEnum [bool_true; bool_false]
 
 let t_of_ast_t = function
@@ -87,11 +87,15 @@ let rec type_expr_vl p vl cvl node expr =
       (* do not check types of arguments... TODO? *)
       let (n, _) = find_node_decl p f in
       List.map (fun (_, _, t) -> t_of_ast_t t) n.ret
+    | AST_tuple x -> List.flatten (List.map sub x)
 
 
-(* type_expr : tp -> string -> typ list *)
+(* type_expr : tp -> string -> expr -> typ list *)
 let type_expr tp = type_expr_vl tp.p tp.all_vars tp.const_vars
 
+let type_var tp node id =
+    let _, _, t = List.find (fun (_, x, _) -> x = (node^"/"^id)) tp.all_vars in t
+
 
 (* Program rooting *)