diff options
Diffstat (limited to 'lisp/emacs-lisp/debug.el')
| -rw-r--r-- | lisp/emacs-lisp/debug.el | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el index 46b0306d64f..6c172d6c31d 100644 --- a/lisp/emacs-lisp/debug.el +++ b/lisp/emacs-lisp/debug.el @@ -90,6 +90,11 @@ The value used here is passed to `quit-restore-window'." :group 'debugger :version "24.3") +(defcustom debug-allow-recursive-debug nil + "If non-nil, erroring in debug and edebug won't recursively debug." + :type 'boolean + :version "29.1") + (defvar debugger-step-after-exit nil "Non-nil means \"single-step\" after the debugger exits.") @@ -534,11 +539,23 @@ The environment used is the one when entering the activation frame at point." (error 0)))) ;; If on first line. (base (debugger--backtrace-base))) (debugger-env-macro - (let ((val (backtrace-eval exp nframe base))) - (prog1 - (debugger--print val t) - (let ((str (eval-expression-print-format val))) - (if str (princ str t)))))))) + (let* ((errored nil) + (val (if debug-allow-recursive-debug + (backtrace-eval exp nframe base) + (condition-case err + (backtrace-eval exp nframe base) + (error (setq errored + (format "%s: %s" + (get (car err) 'error-message) + (car (cdr err))))))))) + (if errored + (progn + (message "Error: %s" errored) + nil) + (prog1 + (debugger--print val t) + (let ((str (eval-expression-print-format val))) + (if str (princ str t))))))))) (define-obsolete-function-alias 'debugger-toggle-locals 'backtrace-toggle-locals "28.1") |