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-rw-r--r--lisp/gnus/nnheader.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/gnus/nnheader.el b/lisp/gnus/nnheader.el
index e138f141c69..d30a7399493 100644
--- a/lisp/gnus/nnheader.el
+++ b/lisp/gnus/nnheader.el
@@ -136,6 +136,7 @@ on your system, you could say something like:
;; (That next-to-last entry is defined as "misc" in the NOV format,
;; but Gnus uses it for xrefs.)
+(defalias 'mail-header-p #'vectorp) ;For lack of tag, it's all we have.
(cl-defstruct (mail-header
(:type vector)
(:constructor nil)