Signaling: (wrong-number-of-arguments #<subr assoc> 3)
  assoc("non-viewer" nil t)
  mm-display-external((#<buffer  *mm*<2>> ("application/x-patch") nil nil ("attachment" (filename . "gnus-0.93-0.94.diff")) "Patches" nil nil) mailcap-save-binary-file)
  mm-display-part((#<buffer  *mm*<2>> ("application/x-patch") nil nil ("attachment" (filename . "gnus-0.93-0.94.diff")) "Patches" nil nil))
  gnus-mm-display-part((#<buffer  *mm*<2>> ("application/x-patch") nil nil ("attachment" (filename . "gnus-0.93-0.94.diff")) "Patches" nil nil))
  gnus-article-press-button()
  call-interactively(gnus-article-press-button)