(Fclear_string): Signal an error if STRING is not a string.

diff --git a/src/fns.c b/src/fns.c
index 693f3eaaa934130a4abade1aaf8d01c240faddcf..cbd0dc91d2bf5f6f1ba5780757e1f9622dd5621e 100644 (file)
--- a/src/fns.c
+++ b/src/fns.c
@@ -2370,6 +2370,7 @@ This makes STRING unibyte and may change its length.  */)
      (string)
      Lisp_Object string;
 {
+  CHECK_STRING (string);
   int len = SBYTES (string);
   bzero (SDATA (string), len);
   STRING_SET_CHARS (string, len);