Debugger entered--Lisp error: (error "Can't find library ess-
5.3.10/")
From this error message, it looks like it did not complete to
"ess-5.3.10" but to "ess-5.3.10/", from which I gather that this is
the directory you added (you added it inside a directory which is
itself in load-path).
That's right. It is a subdirectory of a directory in `load-path'.
It is not, itself, in `load-path'.
So that looks perfectly correct. Or am I misunderstanding
something?
It doesn't seem right to me, but I'm probably naive. I wouldn't
think that it should be a completion at all, since (a) it is not
itself an Emacs-Lisp library in the load-path and (b) there are
no such libraries within it. I would expect TAB to say that there
are no completions.
I would expect that even if this directory were itself a member
of the load-path (which it is not).
But if this is the intended design, no problem. It just didn't
seem like TRT to me. IOW, I didn't expect it.