-;;;
-;;; FIXME: should probably be STREAM-DESIGNATOR, after the term
-;;; used in the ANSI spec (if this is in fact exactly the same thing)
-(sb!xc:deftype streamlike () '(or stream (member nil t)))
+(sb!xc:deftype stream-designator () '(or stream (member nil t)))
+
+;;; something valid as the :EXTERNAL-FORMAT argument to OPEN, LOAD,
+;;; COMPILE-FILE and friends.
+(sb!xc:deftype external-format-designator ()
+ '(or keyword (cons keyword)))