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bug#28850: 26.0.90; Error running timer 'jit-lock-stealth-fontify': (err
bug#28850: 26.0.90; Error running timer 'jit-lock-stealth-fontify': (error "Invalid search bound (wrong side of point)")
Sun, 5 May 2019 09:06:22 +0000
On Sat, May 04, 2019 at 16:36:36 +0300, Eli Zaretskii wrote:
> > Date: Sat, 4 May 2019 12:41:02 +0000
> > Cc: address@hidden, address@hidden
> > From: Alan Mackenzie <address@hidden>
> > However, that nil clearly did happen, so I'll be spending some time
> > working out how it could have happened, and amending
> > c-beginning-of-statement-1 accordingly, whether with your ad-hoc patch
> > or otherwise.
> Thanks in advance. Looking forward to seeing the fix in Emacs near
I have a hypothesis and a patch.
The code at this point in c-beginning-of-statement-1 is in a loop, where
it goes back a sexp at a time, checking for end of statement after each
going back. (Note, the most immediate `while' isn't this loop.)
If that sexp was a paren block, the code checks for a statement boundary
between just before the terminating paren and the starting point for the
sexp movement. However, having gone back over this paren block, it
would be a waste of time to step forward over it again, so the function
notes the starting point in the variable before-sws-pos ("sws" =
"syntactic whitespace"). This before-sws-pos is the argument to the
c-down-list-backward which shouldn't return nil.
This goes wrong if there's a macro between the sexp starting point and
the closing paren. The c-down-list-backward then moves into the macro
(if there's a paren there), and we have nonsense.
That's the theory. The fix, which is now obvious, is to (setq
before-sws-pos ...) after moving back over a macro. Perhaps I should
check the result of c-down-list-backward too, but that's to be done
after checking the current fix.
I can't actually test this myself, so would you please try out the patch
below in your test setup, and let me know whether it fixes this nasty
diff -r 13a9cf53cd4d cc-engine.el
--- a/cc-engine.el Thu May 02 20:41:32 2019 +0000
+++ b/cc-engine.el Sun May 05 08:40:14 2019 +0000
@@ -1148,6 +1148,9 @@
;; Have we moved into a macro?
((and (not macro-start)
+ (setq before-sws-pos (point)))
;; Have we crossed a statement boundary? If not,
;; keep going back until we find one or a "real" sexp.
Alan Mackenzie (Nuremberg, Germany).