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-rw-r--r--lisp/emacs-lisp/edebug.el12
1 files changed, 12 insertions, 0 deletions
diff --git a/lisp/emacs-lisp/edebug.el b/lisp/emacs-lisp/edebug.el
index 0aa6caa37e1..85cc8c8e7ad 100644
--- a/lisp/emacs-lisp/edebug.el
+++ b/lisp/emacs-lisp/edebug.el
@@ -1714,6 +1714,7 @@ contains a circular object."
(cl-macrolet-body . edebug-match-cl-macrolet-body)
(&not . edebug-match-&not)
(&key . edebug-match-&key)
+ (&error . edebug-match-&error)
(place . edebug-match-place)
(gate . edebug-match-gate)
;; (nil . edebug-match-nil) not this one - special case it.
@@ -1847,6 +1848,15 @@ contains a circular object."
(car (cdr pair))))
specs))))
+(defun edebug-match-&error (cursor specs)
+ ;; Signal an error, using the following string in the spec as argument.
+ (let ((error-string (car specs))
+ (edebug-error-point (edebug-before-offset cursor)))
+ (goto-char edebug-error-point)
+ (error "%s"
+ (if (stringp error-string)
+ error-string
+ "String expected after &error in edebug-spec"))))
(defun edebug-match-gate (_cursor)
;; Simply set the gate to prevent backtracking at this level.
@@ -2216,6 +2226,8 @@ into `edebug--cl-macrolet-defs' which is checked in `edebug-list-form-args'."
(def-edebug-spec nested-backquote-form
(&or
+ ("`" &error "Triply nested backquotes (without commas \"between\" them) \
+are too difficult to instrument")
;; Allow instrumentation of any , or ,@ contained within the (\, ...) or
;; (\,@ ...) matched on the next line.
([&or "," ",@"] backquote-form)