Debugger entered--Lisp error: (void-variable font-lock-reference-face)
  eval(font-lock-reference-face t)
  #f(compiled-function (highlight) "Apply HIGHLIGHT following a match.\nHIGHLIGHT should be of the form MATCH-HIGHLIGHT, see `font-lock-keywords'." #<bytecode -0xf53eae0ecf5b08c>)((0 font-lock-reference-face t))
  font-lock-fontify-keywords-region(1 476 nil)
  font-lock-default-fontify-region(1 476 nil)
  font-lock-fontify-region(1 476)
  #f(compiled-function (beg end) #<bytecode -0x15f4e5c68345f707>)(1 476)
  font-lock-ensure()
  mm-display-inline-fontify((#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil))
  mm-inline-text((#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil))
  mm-display-inline((#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil))
  gnus-mime-display-single((#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil))
  gnus-mime-display-part((#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil))
  mapcar(gnus-mime-display-part ((#<buffer  *mm*-212059> ("text/plain") nil #f(compiled-function () #<bytecode 0xd6f85ae254c12cf>) ("inline") nil nil nil) (#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil) (#<buffer  *mm*-886068> ("text/plain") nil nil ("inline") nil nil nil)))
  gnus-mime-display-mixed(((#<buffer  *mm*-212059> ("text/plain") nil #f(compiled-function () #<bytecode 0xd6f85ae254c12cf>) ("inline") nil nil nil) (#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil) (#<buffer  *mm*-886068> ("text/plain") nil nil ("inline") nil nil nil)))
  gnus-mime-display-part((#("multipart/mixed" 0 15 (start nil from "dak@gnu.org" buffer #<buffer  *mm*> boundary "=-=-=")) (#<buffer  *mm*-212059> ("text/plain") nil #f(compiled-function () #<bytecode 0xd6f85ae254c12cf>) ("inline") nil nil nil) (#<buffer  *mm*-971471> ("text/x-lilypond") nil nil ("inline" (filename . "js.ly")) nil nil nil) (#<buffer  *mm*-886068> ("text/plain") nil nil ("inline") nil nil nil)))
  gnus-display-mime()
  gnus-article-prepare-display()
  gnus-article-prepare(157478 nil)
  gnus-summary-display-article(157478 nil)
  gnus-summary-select-article(nil nil pseudo)
  gnus-summary-scroll-up(1)
  funcall-interactively(gnus-summary-scroll-up 1)
  call-interactively(gnus-summary-scroll-up nil nil)
  command-execute(gnus-summary-scroll-up)