Looks like fixing bug#45341 introduced a regression WRT bug#44568: font lock of assignments with type hints Load the code below or see "var3: Mapping" in center of attached png --- # from typing import Mapping, Tuple, Sequence var1: int = 5 var2: Mapping[int, int] = {10: 1024} var3: Mapping[Tuple[int, int], int] = {(2, 5): 32} var4: Sequence[Sequence[int]] = [[1], [1, 2], [1, 2, 3]] var5: Sequence[Mapping[str, Sequence[str]]] = [ { 'red': ['scarlet', 'vermilion', 'ruby'], 'green': ['emerald', 'aqua'] }, { 'sword': ['cutlass', 'rapier'] } ] [a, b, c] = 1, 2, 3 a, *b, c = range(10) inst.a, inst.b, inst.c = 'foo', 'bar', 'baz' (a, b, *c, d) = x, *y = 5, 6, 7, 8, 9 --- In GNU Emacs 28.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.14.5, cairo version 1.14.0) of 2020-12-27 Repository revision: df882c9701755e2ae063f05d3381de14ae09951e Repository branch: master Windowing system distributor 'The X.Org Foundation', version 11.0.11604000 System Description: Debian GNU/Linux 8 (jessie) Configured using: 'configure --with-mailutils -with-modules --with-ffi' Configured features: XPM JPEG TIFF GIF PNG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL GNUTLS LIBXML2 FREETYPE LIBOTF ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS PDUMPER Important settings: value of $LANG: de_DE.UTF-8 locale-coding-system: utf-8-unix Major mode: Python Minor modes in effect: shell-dirtrack-mode: t tooltip-mode: t global-eldoc-mode: t 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 Load-path shadows: None found. Features: (shadow sort mail-extr pp wid-edit descr-text help-mode emacsbug message rmc puny dired dired-loaddefs rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail rmail-loaddefs text-property-search mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils vc-git diff-mode easy-mmode python easymenu tramp-sh tramp tramp-loaddefs trampver tramp-integration files-x tramp-compat shell pcomplete parse-time iso8601 time-date ls-lisp format-spec auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache json subr-x map seq byte-opt gv bytecomp byte-compile cconv comint ring cl-loaddefs cl-lib ansi-color iso-transl tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame minibuffer 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 composite charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice button loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote threads dbusbind inotify dynamic-setting system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 8 172703 19174) (symbols 24 45243 1) (strings 16 133078 2687) (string-bytes 1 2663814) (vectors 8 17215) (vector-slots 4 625868 73776) (floats 8 48 35) (intervals 28 526 70) (buffers 560 12) (heap 1024 17094 3579))