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-rw-r--r--lisp/emacs-lisp/gv.el7
1 files changed, 7 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/gv.el b/lisp/emacs-lisp/gv.el
index ac001af06bd..6c3036da2f2 100644
--- a/lisp/emacs-lisp/gv.el
+++ b/lisp/emacs-lisp/gv.el
@@ -639,6 +639,13 @@ REF must have been previously obtained with `gv-ref'."
;;; Generalized variables.
+;; You'd think noone would write `(setf (error ...) ..)' but it
+;; appears naturally as the result of macroexpansion of things like
+;; (setf (case-exhaustive ...)).
+;; We could generalize this to `throw' and `signal', but it seems
+;; preferable to wait until there's a concrete need.
+(gv-define-expander error (lambda (_do &rest args) `(error . ,args)))
+
;; Some Emacs-related place types.
(gv-define-simple-setter buffer-file-name set-visited-file-name t)
(make-obsolete-generalized-variable