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-rw-r--r--lib/unicode.mli6
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/unicode.mli b/lib/unicode.mli
index aaf455dec5..1f8bd44eee 100644
--- a/lib/unicode.mli
+++ b/lib/unicode.mli
@@ -40,3 +40,9 @@ val ascii_of_ident : string -> string
(** Validate an UTF-8 string *)
val is_utf8 : string -> bool
+
+(** Return the length of a valid UTF-8 string. *)
+val utf8_length : string -> int
+
+(** Variant of {!String.sub} for UTF-8 strings. *)
+val utf8_sub : string -> int -> int -> string