bug#37653: 26.3; edbug backquoted dot is space sensitive

[Lars Ingebrigtsen]

Devon Sean McCullough <Emacs-Hacker2018@jovi.net> writes:

> $ src/emacs --batch -Q --eval '(progn (message emacs-version) (insert "(defun 
> x () `(t .,t))") (eval-defun t))'
> 26.3
> Invalid read syntax: "."

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

Or different reproduction:

(defun x () `(t .,t))

M-: (edebug-read-storing-offsets (current-buffer))

at the start of the line.  I haven't tried debugging this further --
perhaps it's obvious to Stefan what the problem might be; added to the CCs.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no