Dmitry Gutov <dgutov@yandex.ru> writes:

> One note:
>
>>> Is it possible for (cadr item) to be a list and also be `functionp' and yet not
>>> have its car be `lambda'?
>
> The documentation allows FUNCTION in the third element, but
> imenu--subalist-p' is checking whether the second element is a
> function.

Yes, this doesn't make much sense.  I guess this function check was
intended to distinguish a special element

(INDEX-NAME POS FN . ARGS)

from a sub-alist element

(INDEX-NAME . SUB-ALIST).

The check would make sense, if this function was applied to the cdr of
an element, i.e. check if the argument is a SUB-ALIST.  But this is not
how this function is used in imenu.el .

I might have initially (and falsely) determined this as the source of
some bug.

-ap

P.S.: There is another dot missing in the documentation.