bug#32012: 27.0.50; jit-lock--run-functions broken

["Andreas Röhler" <andreas.roehler@online.de>]

On 30.06.2018 08:34, Eli Zaretskii wrote:
>> From: Andreas Röhler <andreas.roehler@online.de>
>> Date: Fri, 29 Jun 2018 22:16:55 +0200
>>
>> Running into it from ert-tests which call ‘jit-lock-fontify-now’
>>
>> When reproduced from emacs -Q in scratch-buffer:
>>
>> Debugger entered--Lisp error: (wrong-number-of-arguments (2 . 2) 0)
>>     jit-lock--run-functions()
>>     eval((jit-lock--run-functions) nil)
>>     elisp--eval-last-sexp(nil)
>>     eval-last-sexp(nil)
>>     funcall-interactively(eval-last-sexp nil)
>>     call-interactively(eval-last-sexp nil nil)
>>     command-execute(eval-last-sexp)
> 
> Why did you think you can call that function tis way?
> 

Hmm, by looking at its signature

(defun jit-lock-fontify-now (&optional start end)

Why that shouldn't work?

Coming here because when using font-lock-fontify-buffer in ert-tests, 
get a warning for interactive use only. Should use font-lock-ensure.
But font-lock-ensure isn't known from ert.

Maybe another bug?

Need with-buffer-prepared-for-jit-lock which seems not being provided by 
uncompiled font-lock.el

Thanks,
Andreas