+ /* In effect, this computes
+ (mapconcat 'single-key-description keys " ")
+ but we shouldn't use mapconcat because it can do GC. */
+
+ len = XFASTINT (Flength (keys));
+ sep = build_string (" ");
+ /* This has one extra element at the end that we don't pass to Fconcat. */
+ args = (Lisp_Object *) alloca (len * 2 * sizeof (Lisp_Object));
+
+ for (i = 0; i < len; i++)
+ {
+ args[i * 2] = Fsingle_key_description (XCONS (keys)->car);
+ args[i * 2 + 1] = sep;
+ keys = XCONS (keys)->cdr;
+ }