Doc fix for concat

* src/fns.c (Fconcat): Note that composition values may not remain eq
in return value of concat.  (Bug#48740)

diff --git a/src/fns.c b/src/fns.c
index a72e41aee5bda860a9af8f2d97faa0888dc2bc13..6f358dd1ba4700029937f1b04d415f4d571477d8 100644 (file)
--- a/src/fns.c
+++ b/src/fns.c
@@ -672,6 +672,9 @@ DEFUN ("concat", Fconcat, Sconcat, 0, MANY, 0,
        doc: /* Concatenate all the arguments and make the result a string.
 The result is a string whose elements are the elements of all the arguments.
 Each argument may be a string or a list or vector of characters (integers).
+
+Values of the `composition' property of the result are not guaranteed
+to be `eq'.
 usage: (concat &rest SEQUENCES)  */)
   (ptrdiff_t nargs, Lisp_Object *args)
 {