In some cases, the "heredoc" system of sh-mode triggers on things that aren't heredocs.
Steps to repeat:
Create a file, test.sh, with the following content:
========8<--------
# This is a normal comment
echo "<<HELLO>>"
# This is incorrectly highlighted as a heredoc comment.
echo "This is also incorrectly highlighted as a heredoc comment"
emacs -Q test.sh
Now, the two last lines are highlighted as a heredoc.
-- Anders
In GNU Emacs 25.0.93.1 (x86_64-w64-mingw32)
of 2016-04-23 built on KAEL
Windowing system distributor 'Microsoft Corp.', version 6.1.7601
Configured using:
'configure --prefix=/tmp/emacs --without-imagemagick 'CFLAGS=-O2
-fomit-frame-pointer -g0''
Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS
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value of $LANG: SVE
locale-coding-system: cp1252
Major mode: Shell-script
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sh-electric-here-document-mode: t
tooltip-mode: t
global-eldoc-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
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Features:
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help-mode easymenu cl-loaddefs pcase cl-lib mail-prsvr mail-utils
vc-dispatcher vc-svn sh-script smie executable time-date mule-util
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded 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 w32notify dbusbind w32
multi-tty make-network-process emacs)
Memory information:
((conses 16 96532 11635)
(symbols 56 20246 0)
(miscs 48 45 138)
(strings 32 18893 3179)
(string-bytes 1 500720)
(vectors 16 12785)
(vector-slots 8 443089 4303)
(floats 8 161 32)
(intervals 56 291 18)
(buffers 976 14))