bug#12925: 24.1; string-make-unibyte instead of string-as-unibyte

[Ethan Glasser-Camp]

This bug report will be sent to the Bug-GNU-Emacs mailing list
and the GNU bug tracker at debbugs.gnu.org.  Please check that
the From: line contains a valid email address.  After a delay of up
to one day, you should receive an acknowledgement at that address.

Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

This is more of a request for information than a bug report.

Consider this code:

(let ((s (string ?\u2019))) ;; RIGHT SINGLE QUOTATION MARK
     (with-temp-buffer 
       (set-buffer-multibyte nil) 
       (insert s) 
       (buffer-string)))

This returns a string with the character ^Y. Whereas, if you switch the
insert and set-buffer-multibyte calls:

(let ((s (string ?\u2019))) ;; RIGHT SINGLE QUOTATION MARK
     (with-temp-buffer 
       (insert s) 
       (set-buffer-multibyte nil) 
       (buffer-string)))

This returns "\342\200\231" (the bytes that make up this character in
utf-8).

The first behavior is documented at the info node "(elisp)Converting
Representations" -- every character is truncated to its low 8 bits. The
second behavior is documented in the following node, "(elisp)Selecting a
Representation" -- the same bytes are left in the buffer but they are
interpreted differently.

I believe that the second behavior is easier to explain and sometimes
useful and that the first one is not. So why does it exist? Why does
inserting multibyte text into a unibyte buffer corrupt it like this?

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.1/etc/DEBUG.


In GNU Emacs 24.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.12)
 of 2012-09-22 on batsu, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11300000
Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 
'--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall -O2'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  diff-auto-refine-mode: t
  cua-mode: t
  global-ethan-wspace-mode: t
  ethan-wspace-mode: t
  ethan-wspace-clean-many-nls-eof-mode: t
  ethan-wspace-clean-no-nl-eof-mode: t
  ethan-wspace-clean-eol-mode: t
  ethan-wspace-clean-tabs-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  show-paren-mode: t
  global-auto-revert-mode: t
  xterm-mouse-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  sml-modeline-mode: t
  me-minor-mode: t
  tooltip-mode: t
  mouse-wheel-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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
i k e SPC u t f - 8 , SPC w e SPC r u n SPC i n t o 
SPC p r o b l e m s SPC w i t h SPC e m a c s ' s SPC 
M I M E S-SPC r o u t i s <backspace> n e s , SPC w 
h i c h SPC f o r c e SPC b u f f e r s SPC t o SPC 
b u SPC <backspace> <backspace> e SPC u n i b y t e 
. M-q SPC <backspace> SPC n o t m u c h - b o <backspace> 
<backspace> g e t - b o d y p a r t i <backspace> - 
i n t e r n a l SPC a l r e a d y SPC M-b M-b M-b M-b 
M-b <return> <return> C-e d o e s SPC t h i s , SPC 
<backspace> <backspace> . SPC B r i n g SPC w i t h 
- - n o t <backspace> <backspace> <backspace> <backspace> 
c u r r e n t - n o t m u c h - s h o w - m e s s g 
e <backspace> <backspace> a g e SPC i n t o SPC l i 
n e . M-q <up> C-e <up> <up> <backspace> M-< S-SPC 
<down> <backspace> <C-S-return> C-_ <up> C-d C-SPC 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> M-w M-x e m <tab> a c s <tab> - r e <tab> <M-backspace> 
<M-backspace> r e <tab> <backspace> <backspace> b u 
g <tab> <tab> <M-backspace> <M-backspace> m <backspace> 
e m <tab> <backspace> <backspace> r e <tab> p o <tab> 
r <tab> <return>

Recent messages:
Auto-saving...done
Mark set [2 times]
C-?:help M-p:pad M-o:open M-c:close M-b:blank M-s:string M-f:fill M-i:incr 
M-n:seq
Mark set
byte-code: End of buffer [2 times]
Auto-saving...done
Saving all Org-mode buffers...
(No files need saving)
Saving all Org-mode buffers... done
Making completion list... [7 times]

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hides /usr/share/emacs/24.1/lisp/org/org-ctags
/home/ethan/.emacs.d/elhome/site-lisp/upstream/org-mode.git/contrib/lisp/org-odt
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/home/ethan/.emacs.d/elhome/site-lisp/upstream/org-mode.git/lisp/org-crypt 
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/home/ethan/.emacs.d/elhome/site-lisp/upstream/org-mode.git/contrib/lisp/org-lparse
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Features:
(shadow emacsbug cua-rect hi-lock shr-color color shr browse-url
gnus-art mm-uu mml2015 epg-config gnus-sum nnoo gnus-group gnus-undo
nnmail mail-source gnus-start gnus-spec gnus-int gnus-range gnus-win
gnus gnus-ems nnheader vc-bzr conf-mode dired-aux tramp-cmds face-remap
mailalias ielm sendmail multi-isearch skeleton sh-script sort mail-extr
mule-util notmuch notmuch-message notmuch-maildir-fcc notmuch-hello
notmuch-show notmuch-print notmuch-crypto notmuch-mua rfc2368
notmuch-address notmuch-wash diff-mode coolj notmuch-query goto-addr
icalendar notmuch-tag crm notmuch-lib json message rfc822 mml mailabbrev
mail-utils gmm-utils mailheader mm-view mml-smime mml-sec smime dig
mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums executable image-file org-irc org-capture vc-git flyspell
ispell bibtex diary-lib diary-loaddefs org noutline outline cal-menu
calendar cal-loaddefs ffap hl-line idle-highlight css-mode-autoloads
find-file-in-project-autoloads idle-highlight-autoloads
inf-ruby-autoloads rainbow-mode-autoloads ruby-electric-autoloads
ruby-mode-autoloads log-edit pcvs-util add-log ethan-misc elide-head
cua-base info color-theme ido tramp-cache tramp-sh tramp tramp-compat
shell pcomplete format-spec tramp-loaddefs recentf tree-widget paren
autorevert xt-mouse imenu thingatpt uniquify ethan-el-get .loaddefs
twittering-mode url url-proxy url-privacy url-expand url-methods
url-history url-cookie url-util url-parse auth-source eieio assoc
gnus-util password-cache url-vars mm-util mail-prsvr mailcap xml
yasnippet undo-tree diff rst compile comint ansi-color ring newcomment
whole-line-or-region browse-kill-ring java-mode-indent-annotations iedit
rect paredit edmacro kmacro rainbow-mode windmove byte-code-cache
initsplit byte-opt warnings advice advice-preload cus-edit cus-start
cus-load wid-edit find-func el-get el-get-autoloads el-get-list-packages
el-get-notify help-mode easymenu view el-get-dependencies el-get-build
el-get-status pp el-get-recipes el-get-byte-compile el-get-methods
el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg
el-get-git-svn el-get-fink el-get-emacswiki el-get-http
el-get-emacsmirror el-get-github el-get-git el-get-elpa package
tabulated-list el-get-darcs el-get-cvs el-get-bzr el-get-brew
el-get-builtin el-get-apt-get el-get-custom el-get-core autoload
help-fns bytecomp byte-compile cconv macroexp cl dired regexp-opt
emacs-goodies-el emacs-goodies-custom emacs-goodies-loaddefs easy-mmode
time-date tooltip ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd
tool-bar dnd fontset image fringe lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
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 loaddefs button faces
cus-face files text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process dbusbind dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)