forward-sentence requires newline at the end of the buffer?

[Alex Schroeder]

In GNU Emacs 20.7.1 (i686-pc-linux-gnu, X toolkit)
 of Sat Jun 24 2000 on snail

In the scratch buffer, I evaluate the following:

(forward-sentence 100)

When there is a trailing newline in the buffer, this moves to the end
of the buffer.  If there is no trailing newline, this results in an
error "End of buffer".

This is a bug.  The presence of a newline at the end of the buffer
should not change the behaviour of forward-sentence.

There is more amiss, however.  The error seems undebuggable...  The
following expression will not open a backtrace buffer.

(let ((debug-on-error t))
  (forward-sentence 100))

This is the real bug that confused me for the last half hour, because
I kept getting an error in a situation where I expected none and I was
unable to get a backtrace for it.

Alex.