paranoid-errors.el

;; Show a backtrace whenever an error is encountered
(defun user-error-to-backtrace (&rest r)
  (with-current-buffer-window
   (get-buffer-create "*issue*")
   #'display-buffer-pop-up-window nil
   (insert (kill-new (with-output-to-string (backtrace))))))

(mapc (lambda (e) (advice-remove e #'user-error-to-backtrace))
      '(user-error error))
(mapc (lambda (e) (advice-add e :before #'user-error-to-backtrace))
      '(user-error error))