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| Guest |
 Posted: Sun Apr 01, 2007 10:01 am |
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Guest
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The Erlang Emacs mode under lib/tools/emacs/erlang.el in the OTP
distribution contains a bug that breaks unicode handling in other parts
of Emacs after an Erlang buffer has been visited.
I noticed the problem on XEmacs 21.4.19 where after loading an Erlang
file, visiting a Gnus (v5.10.7) summary buffer containing unicode
subject lines produces an error like this:
(args-out-of-range "<unicode string>" 34)
string-match("\\b[^@ <>]+[!@][^@ <>]+\\b" "<unicode string>")
I subsequently managed to reproduce the problem using the following
sequence:
1) start XEmacs
2) visit an Erlang buffer
3) execute the following Elisp expression: (string-match "\\b" "Ӳ")
--> args-out-of-range-error
When omitting step 2, step 3 succeeds.
I tracked down the problem to a missing buffer-local declaration in
erlang.el. Adding
(make-local-variable 'parse-sexp-lookup-properties)
to erlang-electric-init fixes that. I have attached a patch.
The bug is present in R11B-4 and R11B-3. I haven't looked back further,
but chances are it has been there for a while. It is also present in the
erlang-mode debian package.
I cannot reproduce the bug on Gnu Emacs, though I suspect that there too
some undesirable behaviour can result from erlang.el stomping on
parse-sexp-lookup-properties. The fix certainly doesn't appear to do any
harm.
Regards,
Matthias.
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