bug#16769: 24.3.50; electric-pair-mode: args-out-of-range

[Xue Fuqiao <xfq@gnu.org>]

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To reproduce:

  emacs -Q --eval '(setq debug-on-error t)'
  M-x electric-pair-mode RET
  C-x h DEL

Then Emacs signals an error.  The backtrace is attached.


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Debugger entered--Lisp error: (args-out-of-range 0 1)
  parse-partial-sexp(1 0)
  #[257 "\301e\300\242\"\207" [(0) parse-partial-sexp] 4 "\n\n(fn IGNORED)"]((args-out-of-range 0 1))
  funcall(#[257 "\301e\300\242\"\207" [(0) parse-partial-sexp] 4 "\n\n(fn IGNORED)"] (args-out-of-range 0 1))
  syntax-ppss(0)
  electric-pair-syntax-info(nil)
  electric-pair-backward-delete-char(1 nil t)
  electric-pair-backward-delete-char-untabify(1 nil)
  call-interactively(electric-pair-backward-delete-char-untabify nil nil)
  command-execute(electric-pair-backward-delete-char-untabify)

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In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.8.6)
 of 2014-01-25 on xfq-ThinkPad-X1-Carbon
Repository revision: 116149 larsi@gnus.org-20140125005216-vwndukqrdbq2xv4u
System Description:	Ubuntu 13.10

Configured using:
 `configure --enable-checking --disable-silent-rules
 --enable-gtk-deprecation-warnings'

Important settings:
  value of $LC_MONETARY: en_US.UTF-8
  value of $LC_NUMERIC: en_US.UTF-8
  value of $LC_TIME: en_US.UTF-8
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix