Re: 23.0.60; scroll-up gives something between error and message

["Lennart Borgman (gmail)" <lennart.borgman@gmail.com>]

Stefan Monnier wrote:
>> There is something strange with the error handling in scroll-up. When
>> calling (scroll-up 1) in an empty buffer execution of the function calling
>> it stopped and a message is given. However there is no error generated.
> 
> What makes you think no error is generated?


There is no traceback, but yes I did not try. Here is a try:

(defun test-scroll ()
   (interactive)
   (setq debug-on-error t)
   (let* ((buffer-name "test-scroll")
         (buffer (get-buffer buffer-name)))
     (when buffer (kill-buffer buffer))
     (setq buffer (get-buffer-create buffer-name))
     (switch-to-buffer buffer)
     (message "here 1") (sit-for 1)
     (condition-case err
         (scroll-up 1)
       (error (message "scroll-up error: %s" err)
              (sit-for 1)))
     (message "here 2") (sit-for 1)
     (scroll-up 1)
     (message "here 3") (sit-for 1)
     ))

The output is now

here 1
scroll-up error: (end-of-buffer)
here 2
let*: End of buffer

There is no *Backtrace* window shown for the second (scroll-up 1). Is 
there when you test it?