extern void set_buffer_temp (struct buffer *);
extern Lisp_Object buffer_local_value_1 (Lisp_Object, Lisp_Object);
extern void record_buffer (Lisp_Object);
-extern void buffer_slot_type_mismatch (Lisp_Object, int) NO_RETURN;
+extern _Noreturn void buffer_slot_type_mismatch (Lisp_Object, int);
extern void fix_overlays_before (struct buffer *, ptrdiff_t, ptrdiff_t);
extern void mmap_set_vars (int);