set-face-stipple

Hi, In the file lisp/faces.el: (defun set-face-stipple (face pixmap &optional frame) "[...]" (while (not (find-face face)) (setq face (signal 'wrong-type-argument (list 'facep face)))) (locate-file pixmap x-bitmap-file-path '(".xbm" "")) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ why is the line here? It causes an error as follows: (set-face-stipple 'FACE '(4 4 "\x08\x02\x04\x01")) => Signaling: (wrong-type-argument stringp (4 4 "^H^B^D^A")) -- Katsumi Yamaoka <yamaoka(a)jpl.org&gt;