Hi Aidan, after pulling these two: [nix-shell:~/build/xemacs-beta]$ hg log -l2 changeset: 7098:9a9e9993b412 tag: tip user: Aidan Kehoe <kehoea(a)parhasard.net&gt; date: Mon Oct 01 00:42:55 2018 +0100 summary: Advise against #'marker-position in its docstring; follow this advice, lis changeset: 7097:45b565af6128 user: Aidan Kehoe <kehoea(a)parhasard.net&gt; date: Fri Sep 28 11:00:54 2018 +0100 summary: Correct a couple of small bugs in #'byte-optimize-{cdr,car}; add tests I get this: (1) (general/warning) Error in font-lock-pre-idle-hook: Invalid argument: Marker does not point anywhere Backtrace follows: backtrace(nil t) # bind (standard-output standard-output handler-arg-name) backtrace-in-condition-handler-eliminating-handler(#:call-trapping-errors-Ldc9FC5Hr) # bind (errstr #:call-trapping-errors-Ldc9FC5Hr) #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (#:call-trapping-errors-Ldc9FC5Hr) "...(17)" [#:call-trapping-errors-Ldc9FC5Hr errstr error-message-string lwarn general warning "Error in %s: %s\n\nBacktrace follows:\n\n%s" font-lock-pre-idle-hook backtrace-in-condition-handler-eliminating-handler] 8 0x24f3>((invalid-argument "Marker does not point anywhere")) # bind (lisp-like cache state string beg depth loudly end start) font-lock-fontify-syntactically-region(1 395 nil) # (unwind-protect ...) # bind (modified old-syntax-table buffer-undo-list inhibit-read-only buffer-file-name buffer-file-truename loudly end beg) font-lock-default-fontify-region(1 395 nil) # bind (loudly end beg) font-lock-fontify-region(1 395) # bind (val end beg) #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (beg end val) "...(5)" [end beg font-lock-fontify-region] 3 0x24f8>(1 395 t) map-range-table(#<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (beg end val) "...(5)" [end beg font-lock-fontify-region] 3 0x24f8> #<range-table [1 395) t 0x2>) # (unwind-protect ...) # (unwind-protect ...) # (unwind-protect ...) byte-code("..." [font-lock-pending-buffer-table font-lock-mode font-lock-range-table buffer exit nil remhash buffer-live-p clear-range-table map-extents #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (ex dummy-maparg) "...(32)" [font-lock-range-table ex end beg extent-start-position extent-end-position 0 1 put-range-table t] 5 0x24f7> font-lock-pending t put-text-property map-range-table #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (beg end val) "...(5)" [end beg font-lock-fontify-region] 3 0x24f8>] 9) # (catch exit ...) # bind (dummy buffer) #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (buffer dummy) "...(4)" [exit (byte-code " ¬„ÄŵˆÆ\"ˆÇ!­¤È\n!ˆrqˆŠŒ~ˆÉÊʼn‰‰‰ËÌ&ˆÍedËÅ$ˆÎÏ\n\"+‡" [font-lock-pending-buffer-table font-lock-mode font-lock-range-table buffer exit nil remhash buffer-live-p clear-range-table map-extents #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (ex dummy-maparg) "...(32)" [font-lock-range-table ex end beg extent-start-position extent-end-position 0 1 put-range-table t] 5 0x24f7> font-lock-pending t put-text-property map-range-table #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (beg end val) "...(5)" [end beg font-lock-fontify-region] 3 0x24f8>] 9)] 2 0x24f9>(#<buffer "*scratch*"> t) # (unwind-protect ...) maphash(#<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (buffer dummy) "...(4)" [exit (byte-code " ¬„ÄŵˆÆ\"ˆÇ!­¤È\n!ˆrqˆŠŒ~ˆÉÊʼn‰‰‰ËÌ&ˆÍedËÅ$ˆÎÏ\n\"+‡" [font-lock-pending-buffer-table font-lock-mode font-lock-range-table buffer exit nil remhash buffer-live-p clear-range-table map-extents #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (ex dummy-maparg) "...(32)" [font-lock-range-table ex end beg extent-start-position extent-end-position 0 1 put-range-table t] 5 0x24f7> font-lock-pending t put-text-property map-range-table #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (beg end val) "...(5)" [end beg font-lock-fontify-region] 3 0x24f8>] 9)] 2 0x24f9> #<hash-table :size 0/29 :weakness key 0x8aa>) # (unwind-protect ...) # bind (#:match-data) font-lock-fontify-pending-extents() #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") nil "...(10)" [font-lock-pending-buffer-table hash-table-count 0 font-lock-fontify-pending-extents] 2 0x24f4>() # (unwind-protect ...) call-with-condition-handler(#<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") (#:call-trapping-errors-Ldc9FC5Hr) "...(17)" [#:call-trapping-errors-Ldc9FC5Hr errstr error-message-string lwarn general warning "Error in %s: %s\n\nBacktrace follows:\n\n%s" font-lock-pre-idle-hook backtrace-in-condition-handler-eliminating-handler] 8 0x24f3> #<compiled-function (from "/afs/deinprogramm.de/home/sperber/build/xemacs-beta/lisp/font-lock.elc") nil "...(10)" [font-lock-pending-buffer-table hash-table-count 0 font-lock-fontify-pending-extents] 2 0x24f4>) # (condition-case ... . ((error))) font-lock-pre-idle-hook() # (unwind-protect ...) # (catch #<INTERNAL OBJECT (XEmacs bug?) (opaque, size=0) 0x0> ...) # (unwind-protect ...) # (unwind-protect ...) # bind (inhibit-quit) # (unwind-protect ...) # (unwind-protect ...) # bind (inhibit-quit) (next-event "[internal]") # (condition-case ... . error) # (catch top-level ...)