bug#25441: 26.0.50; Can't autocomplete symbol names ending in ?

[Philipp Stephani]

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.