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-rw-r--r--src/ast_util.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ast_util.ml b/src/ast_util.ml
index 0817e46c..8b51edd3 100644
--- a/src/ast_util.ml
+++ b/src/ast_util.ml
@@ -571,6 +571,7 @@ and string_of_typ_aux = function
| Typ_app (id, args) -> string_of_id id ^ "(" ^ string_of_list ", " string_of_typ_arg args ^ ")"
| Typ_fn (typ_arg, typ_ret, eff) ->
string_of_typ typ_arg ^ " -> " ^ string_of_typ typ_ret ^ " effect " ^ string_of_effect eff
+ | Typ_bidir (typ1, typ2) -> string_of_typ typ1 ^ " <-> " ^ string_of_typ typ2
| Typ_exist (kids, nc, typ) ->
"{" ^ string_of_list " " string_of_kid kids ^ ", " ^ string_of_n_constraint nc ^ ". " ^ string_of_typ typ ^ "}"
and string_of_typ_arg = function