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-rw-r--r--src/Identifiers.ml1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Identifiers.ml b/src/Identifiers.ml
index 3a900643..757c9df5 100644
--- a/src/Identifiers.ml
+++ b/src/Identifiers.ml
@@ -44,6 +44,7 @@ module type Id = sig
val of_int : int -> id
val nth : 'a list -> id -> 'a
+ (* TODO: change the signature (invert the index and the list *)
val nth_opt : 'a list -> id -> 'a option