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

From: Andreas Röhler
Subject: bug#32012: 27.0.50; jit-lock--run-functions broken
Date: Sat, 30 Jun 2018 13:19:40 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 30.06.2018 12:57, Eli Zaretskii wrote:
Cc: address@hidden
From: Andreas Röhler <address@hidden>
Date: Sat, 30 Jun 2018 08:54:49 +0200

On 30.06.2018 08:34, Eli Zaretskii wrote:
From: Andreas Röhler <address@hidden>
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)
     eval((jit-lock--run-functions) nil)
     funcall-interactively(eval-last-sexp nil)
     call-interactively(eval-last-sexp nil nil)

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?

That's not what the backtrace suggests.  It suggests that you invoked
jit-lock--run-functions via eval-last-sexp.

Right. But the arguments are optional.
Wherefrom to expect it failing?

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