bytes-utf-8-length: fix result contract in docs

2017-08-02 07:30:57 -06:00 · 2017-08-02 07:30:57 -06:00 · 1ca8b6d533
commit 1ca8b6d533
parent 58dfcee14a
1 changed files with 1 additions and 1 deletions
--- a/pkgs/racket-doc/scribblings/reference/bytes.scrbl
+++ b/pkgs/racket-doc/scribblings/reference/bytes.scrbl
@ -344,7 +344,7 @@ For communication among @tech{places}, the new byte string is allocated in the
                             [err-char (or/c #f char?) #f]
                             [start exact-nonnegative-integer? 0]
                             [end exact-nonnegative-integer? (bytes-length bstr)])
-         exact-nonnegative-integer?]{
+         (or/c exact-nonnegative-integer? #f)]{
 Returns the length in characters of the UTF-8 decoding of
 @racket[bstr]'s substring from @racket[start] to @racket[end], but without
 actually generating the decoded characters. If @racket[err-char] is