bug#21896: 24.5; Inconsistent handling of braces in smie

[mail@ap4y.me]

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For a smie grammar like this:

(id)
(inst ("if" exp "{" insts "}")
      (exp))
(insts (insts ";" insts) (inst))
(exp (exp "." id)
     (id ":" exp)
     (exp "=" exp))
(exps (exps "," exps) (exp))

Using 2 possible ways of hanling braces tokens:

1. Using default lexer rules for braces (as per documentation).
2. Manually tokenizing braces in lexer (uncomment lines 196-197 and
213-214 in provided source file)

I'm getting different indentation results. For the case number 1,
indentation of the consutriction:

if true {
    |foo
}

is invalid and from the logs it seems like smie doesn't parse this
constructor correctly.

For the case number 2 indentation works as expected, but for the
construction like this (which is a simple sexp):

{
}|

I'm getting "Mismatching parenthesis" error when I'm calling
blink-matching-open.


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In GNU Emacs 24.5.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-09-10 on foutrelis
Windowing system distributor `The X.Org Foundation', version 11.0.11704000
System Description:	Arch Linux

Configured using:
 `configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --with-x-toolkit=gtk3 --with-xft
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
 --param=ssp-buffer-size=4' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Important settings:
  value of $EMACSLOADPATH: /home/ap4y/github/swift-mode/.cask/24.5.1/elpa/flycheck-cask-20150920.453:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/flycheck-20151027.755:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/dash-20151021.113:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/pkg-info-20150517.443:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/epl-20150517.433:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/let-alist-1.0.4:/home/ap4y/github/swift-mode/.cask/24.5.1/elpa/s-20150924.406:/usr/share/emacs/24.5/lisp:/usr/share/emacs/24.5/lisp/vc:/usr/share/emacs/24.5/lisp/url:/usr/share/emacs/24.5/lisp/textmodes:/usr/share/emacs/24.5/lisp/progmodes:/usr/share/emacs/24.5/lisp/play:/usr/share/emacs/24.5/lisp/org:/usr/share/emacs/24.5/lisp/nxml:/usr/share/emacs/24.5/lisp/net:/usr/share/emacs/24.5/lisp/mh-e:/usr/share/emacs/24.5/lisp/mail:/usr/share/emacs/24.5/lisp/leim:/usr/share/emacs/24.5/lisp/language:/usr/share/emacs/24.5/lisp/international:/usr/share/emacs/24.5/lisp/gnus:/usr/share/emacs/24.5/lisp/eshell:/usr/share/emacs/24.5/lisp/erc:/usr/share/emacs/24.5/lisp/emulation:/usr/share/emacs/24.5/lisp/emacs-parallel:/usr/share/emacs/24.5/lisp/emacs-lisp:/usr/share/emacs/24.5/lisp/cedet:/usr/share/emacs/24.5/lisp/calendar:/usr/share/emacs/24.5/lisp/calc:/usr/share/emacs/24.5/lisp/obsolete
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Swift

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
delete-backward-char: Text is read-only

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
help-fns mail-prsvr mail-utils vc-git swift-mode edmacro kmacro easymenu
derived pcase smie cl-loaddefs cl-lib comint ansi-color ring rx
time-date tooltip electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)

Memory information:
((conses 16 80479 5190)
 (symbols 48 18853 0)
 (miscs 40 39 110)
 (strings 32 13296 5273)
 (string-bytes 1 380693)
 (vectors 16 10443)
 (vector-slots 8 396412 6566)
 (floats 8 66 65)
 (intervals 56 185 0)
 (buffers 960 12)
 (heap 1024 41403 1158))