Philipp Stephani <p.stephani2@gmail.com> schrieb am Fr., 13. Jan. 2017 um
19:04 Uhr:

>
> In *scratch*, write
>
> (defun foo? ())
>
> and hit C-j to evaluate the definition.  Then, try to display the help
> screen of foo? using C-h f foo? RET.  The minibuffer won't let you enter
> ? or auto-complete foo to foo?, even though ? can be part of a symbol.
>

I've just found that the Emacs manual documents this behavior (? prints a
list of possible completions). Given that ? can only have one function, and
the current one does make sense, this behavior is rather a design choice
than a bug. Closing.