v0.26.1

Features

• Add paging to '-h' and '--help' see PR #3478 (@MuntasirSZN)

Bugfixes

• Fix hang when using --list-themes with an explicit pager, see #3457 (@abhinavcool42)
• Fix negative values of N not being parsed in <N:M> line ranges without = flag value separator, see #3442 (@lmmx)
• Fix broken Docker syntax preventing use of custom assets, see #3476 (@keith-hall)
• Fix decorations being applied unexpectedly when piping. Now only line numbers explicitly required on the command line should be applied in auto decorations mode for cat compatibility. See #3496 (@keith-hall)
• Fix diagnostics attempting to find the version of an executable named builtin when builtin pager is used. See #3498 (@keith-hall)
• --help now correctly reads the config file for theme information etc. See #3507 (@keith-hall)

Other

• Improve README documentation on pager options passed to less, see #3443 (@injust)
• Make PowerShell completions compatible with PowerShell v5.1, see #3495 (@keith-hall)
• Use more robust approach to escaping in Bash completions, see #3448 (@akinomyoga)

Syntaxes

• Update quadlet syntax mapping to include *.{build,pod} files #3484 (@cyqsimon)
• Fix inconsistencies in Ada syntax, see #3481 (@AldanTanneo)
• Add syntax mapping for podman's artifact quadlet files, see #3497 (@xduugu)
• Highlight Korn Shell scripts (i.e. with a shebang of ...ksh) using Bash syntax, see #3509 (@keith-hall)

v0.26.0

Features

• Add build for windows/ARM64 platform. #3190 (@alcroito)
• Add paging to --list-themes, see PR #3239 (@einfachIrgendwer0815)
• Support negative relative line ranges, e.g. bat -r :-10 / bat -r='-10:', see #3068 (@ajesipow)
• Support context in line ranges, e.g. bat -r 30::5 / bat -r 30:40:5, see #3345 (@cavanaug)
• Add built-in 'minus' pager, e.g. bat --pager=builtin see PR #3402 (@academician)

Bugfixes

• Fix UTF-8 BOM not being stripped for syntax detection, see #3314 (@krikera)
• Fix BAT_THEME_DARK and BAT_THEME_LIGHT being ignored, see issue #3171 and PR #3168 (@bash)
• Prevent --list-themes from outputting default theme info to stdout when it is piped, see #3189 (@einfachIrgendwer0815)
• Rename some submodules to fix Dependabot submodule updates, see issue #3198 and PR #3201 (@victor-gp)
• Make highlight tests fail when new syntaxes don't have fixtures PR #3255 (@dan-hipschman)
• Fix crash for multibyte characters in file path, see issue #3230 and PR #3245 (@HSM95)
• Add missing mappings for various bash/zsh files, see PR #3262 (@AdamGaskins)
• Send all bat errors to stderr by default, see #3336 (@JerryImMouse)
• Make --map-syntax target case insensitive to match --language, see #3206 (@keith-hall)
• Correctly determine the end of the line in UTF16LE/BE input #3369 (@keith-hall)
• --style=changes no longer prints a two-space indent when the file is unmodified, see issue #2710 and PR #3406 (@jyn514)
• Add missing shell completions, see #3411 (@keith-hall)
• Execute help/version/diagnostic commands even with invalid config/arguments present, see #3414 (@keith-hall)
• Fixed line numbers (-n) and style components not printing when piping output, see issue #2935 and PR #3438 (@lmmx)

Other

• Update base16 README links to community driven base16 work #2871 (@JamyGolden)
• Work around build failures when building bat from vendored sources #3179 (@dtolnay)
• CICD: Stop building for x86_64-pc-windows-gnu which fails #3261 (Enselic)
• CICD: CICD: replace windows-2019 runners with windows-2025 #3339 (@cyqsimon)
• Build script: replace string-based codegen with quote-based codegen #3340 (@cyqsimon)
• Improve code coverage of --list-languages parameter #2942 (@sblondon)
• Only start offload worker thread when there's more than 1 core #2956 (@cyqsimon)
• Update terminal-colorsaurus (the library used for dark/light detection) to 1.0, see #3347 (@bash)
• Update console dependency to 0.16, see #3351 (@musicinmybrain)
• Fixed some typos #3244 (@ssbarnea)
• Update onig_sys dependency to 69.9.1 to fix a gcc build failure #3400 (@CosmicHorrorDev)
• Add a cargo feature (vendored-libgit2) to build with vendored libgit2 version without depending on the system's one #3426 (@0x61nas)
• Update syntect dependency to v5.3.0 to fix a few minor bugs, see #3410 (@keith-hall)

Syntaxes

• Add syntax mapping for paru configuration files #3182 (@cyqsimon)
• Add support for Idris 2 programming language #3150 (@buzden)
• Add syntax mapping for nix's 'flake.lock lockfiles #3196 (@odilf)
• Improvements to CSV/TSV highlighting, with autodetection of delimiter and support for TSV files, see #3186 (@keith-
• Improve (Sys)log error highlighting, see #3205 (@keith-hall)
• Map ndjson extension to JSON syntax, see #3209 (@keith-hall)
• Map files with csproj, vbproj, props and targets extensions to XML syntax, see #3213 (@keith-hall)
• Add debsources syntax to highlight /etc/apt/sources.list files, see #3215 (@keith-hall)
• Add syntax definition and test file for GDScript highlighting, see #3236 (@chetanjangir0)
• Add syntax test file for Odin highlighting, see #3241 (@chetanjangir0)
• Update quadlet syntax mapping rules to cover quadlets in subdirectories #3299 (@cyqsimon)
• Add syntax Typst #3300 (@cskeeters)
• Map .mill files to Scala syntax for Mill build tool configuration files #3311 (@krikera)
• Add syntax highlighting for VHDL, see #3337 (@JerryImMouse)
• Add syntax mapping for certbot certificate configuration #3338 (@cyqsimon)
• Update Lean syntax from Lean 3 to Lean 4 #3322 (@YDX-2147483647)
• Map .flatpakref and .flatpakrepo files to INI syntax #3353 (@Ferenc-)
• Update hosts syntax #3368 (@keith-hall)
• Map .kshrc files to Bash syntax #3364 (@ritoban23)
• Map /var/log/dmesg files to Syslog syntax #3412 (@keith-hall)
• Add syntax definition and test file for Go modules(go.mod and go.sum) highlighting, see #3424 (@DarkMatter-999)
• Syntax highlighting for typescript code blocks within Markdown files, see #3435 (@MuntasirSZN)

Themes

• Add Catppuccin, see #3317 (@SchweGELBin)
• Updated Catppuccin, see #3333 (@SchweGELBin)
• Updated gruvbox, see #3372 (@Nicholas42)
• Updated GitHub theme, see #3382 (@CosmicHorrorDev)
• Updated ANSI theme to highlight JSON object keys differently from values, see #3413 (@keith-hall)

v0.25.0

Features

• Set terminal title to file names when Paging is not Paging::Never #2807 (@Oliver-Looney)
• bat --squeeze-blank/bat -s will now squeeze consecutive empty lines, see #1441 (@eth-p) and #2665 (@einfachIrgendwer0815)
• bat --squeeze-limit to set the maximum number of empty consecutive when using --squeeze-blank, see #1441 (@eth-p) and #2665 (@einfachIrgendwer0815)
• PrettyPrinter::squeeze_empty_lines to support line squeezing for bat as a library, see #1441 (@eth-p) and #2665 (@einfachIrgendwer0815)
• Syntax highlighting for JavaScript files that start with #!/usr/bin/env bun #2913 (@sharunkumar)
• bat --strip-ansi={never,always,auto} to remove ANSI escape sequences from bat's input, see #2999 (@eth-p)
• Add or remove individual style components without replacing all styles #2929 (@eth-p)
• Automatically choose theme based on the terminal's color scheme, see #2896 (@bash)
• Add option --binary=as-text for printing binary content, see issue #2974 and PR #2976 (@einfachIrgendwer0815)
• Make shell completions available via --completion <shell>, see issue #2057 and PR #3126 (@einfachIrgendwer0815)
• Syntax highlighting for puppet code blocks within Markdown files, see #3152 (@liliwilson)

Bugfixes

• Fix long file name wrapping in header, see #2835 (@FilipRazek)
• Fix NO_COLOR support, see #2767 (@acuteenvy)
• Fix handling of inputs with OSC ANSI escape sequences, see #2541 and #2544 (@eth-p)
• Fix handling of inputs with combined ANSI color and attribute sequences, see #2185 and #2856 (@eth-p)
• Fix panel width when line 10000 wraps, see #2854 (@eth-p)
• Fix compile issue of time dependency caused by standard library regression #3045 (@cyqsimon)
• Fix override behavior of --plain and --paging, see issue #2731 and PR #3108 (@einfachIrgendwer0815)
• Fix bugs in $LESSOPEN support, see #2805 (@Anomalocaridid)

Other

• Upgrade to Rust 2021 edition #2748 (@cyqsimon)
• Refactor and cleanup build script #2756 (@cyqsimon)
• Checks changelog has been written to for PRs in CI #2766 (@cyqsimon)
  • Use GitHub API to get correct PR submitter #2791 (@cyqsimon)
• Minor benchmark script improvements #2768 (@cyqsimon)
• Update Arch Linux package URL in README files #2779 (@brunobell)
• Update and improve zsh completion, see #2772 (@okapia)
• More extensible syntax mapping mechanism #2755 (@cyqsimon)
• Use proper Architecture for Debian packages built for musl, see #2811 (@Enselic)
• Pull in fix for unsafe-libyaml security advisory, see #2812 (@dtolnay)
• Update git-version dependency to use Syn v2, see #2816 (@dtolnay)
• Update git2 dependency to v0.18.2, see #2852 (@eth-p)
• Improve performance when color output disabled, see #2397 and #2857 (@eth-p)
• Relax syntax mapping rule restrictions to allow brace expansion #2865 (@cyqsimon)
• Apply clippy fixes #2864 (@cyqsimon)
• Faster startup by offloading glob matcher building to a worker thread #2868 (@cyqsimon)
• Display which theme is the default one in basic output (no colors), see #2937 (@sblondon)
• Display which theme is the default one in colored output, see #2838 (@sblondon)
• Add aarch64-apple-darwin ("Apple Silicon") binary tarballs to releases, see #2967 (@someposer)
• Update the Lisp syntax, see #2970 (@ccqpein)
• Use bat's ANSI iterator during tab expansion, see #2998 (@eth-p)
• Support 'statically linked binary' for aarch64 in 'Release' page, see #2992 (@tzq0301)
• Update options in shell completions and the man page of bat, see #2995 (@akinomyoga)
• Update nix dev-dependency to v0.29.0, see #3112 (@decathorpe)
• Bump MSRV to 1.74, see #3154 (@keith-hall)
• Update clircle dependency to remove winapi transitive dependency, see #3113 (@niklasmohrin)

Syntaxes

• cmd-help: scope subcommands followed by other terms, and other misc improvements, see #2819 (@victor-gp)
• Upgrade JQ syntax, see #2820 (@dependabot[bot])
• Add syntax mapping for quadman quadlets #2866 (@cyqsimon)
• Map containers .conf files to TOML syntax #2867 (@cyqsimon)
• Associate .xsh files with xonsh syntax that is Python, see #2840 (@anki-code)
• Associate JSON with Comments .jsonc with json syntax, see #2795 (@mxaddict)
• Associate JSON-LD .jsonld files with json syntax, see #3037 (@vorburger)
• Associate .textproto files with ProtoBuf syntax, see #3038 (@vorburger)
• Associate GeoJSON .geojson files with json syntax, see #3084 (@mvaaltola)
• Associate .aws/{config,credentials}, see #2795 (@mxaddict)
• Associate Wireguard config /etc/wireguard/*.conf, see #2874 (@cyqsimon)
• Add support for CFML, see #3031 (@brenton-at-pieces)
• Map *.mkd files to Markdown syntax, see issue #3060 and PR #3061 (@einfachIrgendwer0815)
• Add syntax mapping for CITATION.cff, see #3103 (@Ugzuzg)
• Add syntax mapping for kubernetes config files #3049 (@cyqsimon)
• Adds support for pipe delimiter for CSV #3115 (@pratik-m)
• Add syntax mapping for /etc/pacman.conf #2961 (@cyqsimon)
• Associate uv.lock with TOML syntax, see #3132 (@fepegar)

Themes

• Patched/improved themes for better Manpage syntax highlighting support, see #2994 (@keith-hall).

bat as a library

• Changes to syntax_mapping::SyntaxMapping #2755 (@cyqsimon)
  • SyntaxMapping::get_syntax_for is now correctly public
  • [BREAKING] SyntaxMapping::{empty,builtin} are removed; use SyntaxMapping::new instead
  • [BREAKING] SyntaxMapping::mappings is replaced by SyntaxMapping::{builtin,custom,all}_mappings
• Make Controller::run_with_error_handler's error handler FnMut, see #2831 (@rhysd)
• Improve compile time by 20%, see #2815 (@dtolnay)
• Add theme::theme for choosing an appropriate theme based on the
  terminal's color scheme, see #2896 (@bash)
  • [BREAKING] Remove HighlightingAssets::default_theme. Use theme::default_theme instead.
• Add PrettyPrinter::print_with_writer for custom output destinations, see #3070 (@kojix2)

v0.24.0

Features

• Add environment variable BAT_PAGING, see #2629 (@einfachIrgendwer0815)
• Add opt-in (--features lessopen) support for LESSOPEN and LESSCLOSE. See #1597, #1739, #2444, #2602, and #2662 (@Anomalocaridid)

Bugfixes

• Fix more not being found on Windows when provided via BAT_PAGER, see #2570, #2580, and #2651 (@mataha)
• Switched default behavior of --map-syntax to be case insensitive #2520
• Updated version of serde_yaml to 0.9. See #2627 (@Raghav-Bell)
• Fix arithmetic overflow in LineRange::from and LineRange::parse_range, see #2674, #2698 (@skoriop)
• Fix paging not happening when stdout is interactive but stdin is not, see #2574 (@Nigecat)
• Make -pp override --paging and vice versa when passed as a later argument, see #2660 (@J-Kappes)

Other

• Output directory for generated assets (completion, manual) can be customized, see #2515 (@tranzystorek-io)
• Use the is-terminal crate instead of atty, see #2530 (@nickelc)
• Add Winget Releaser workflow, see #2519 (@sitiom)
• Bump MSRV to 1.70, see #2651 (@mataha)

Syntaxes

• Associate os-release with bash syntax, see #2587 (@cyqsimon)
• Associate Containerfile with Dockerfile syntax, see #2606 (@einfachIrgendwer0815)
• Replaced quotes with double quotes so fzf integration example script works on windows and linux. see #2095 (@johnmatthiggins)
• Associate ksh files with bash syntax, see #2633 (@johnmatthiggins)
• Associate sarif files with JSON syntax, see #2695 (@rhysd)
• Associate ron files with rust syntax, see #2427 (@YeungOnion)
• Add support for WebGPU Shader Language, see #2692 (@rhysd)
• Add .dpkg-new and .dpkg-tmp to ignored suffixe, see #2595 (@scop)
• fix: Add syntax mapping *.jsonl => json, see #2539 (@WinterCore)
• Update Julia syntax, see #2553 (@dependabot)
• add NSIS support, see #2577 (@idleberg)
• Update ssh-config, see #2697 (@mrmeszaros)

bat as a library

• Add optional output_buffer arg to Controller::run() and Controller::run_with_error_handler(), see #2618 (@Piturnah)

Features

• Implemented -S and --chop-long-lines flags as aliases for --wrap=never. See #2309 (@johnmatthiggins)
• Breaking change: Environment variables can now override config file settings (but command-line arguments still have the highest precedence), see #1152, #1281, and #2381 (@aaronkollasch)
• Implemented --nonprintable-notation=caret to support showing non-printable characters using caret notation. See #2429 (@einfachIrgendwer0815)

Bugfixes

• Fix bat cache --clear not clearing the --target dir if specified. See #2393 (@miles170)

Other

• Various bash completion improvements, see #2310 (@scop)
• Disable completion of cache subcommand, see #2399 (@cyqsimon)
• Signifigantly improve startup performance on macOS, see #2442 (@BlackHoleFox)
• Bump MSRV to 1.62, see #2496 (@Enselic)

Syntaxes

• Added support for Ada, see #1300 and #2316 (@dkm)
• Added todo.txt syntax, see #2375 (@BANOnotIT)
• Improve Manpage.sublime-syntax. See #2364 (@Freed-Wu) and #2461 (@keith-hall)
• Added a new requirements.txt syntax, see #2361 (@Freed-Wu)
• Added a new VimHelp syntax, see #2366 (@Freed-Wu)
• Associate pdm.lock with TOML syntax, see #2410
• Todo.txt: Fix highlighting of contexts and projects at beginning of done.txt, see #2411
• cmd-help: overhaul scope names (colors) to improve theme support; misc syntax improvements. See #2419 (@victor-gp)
• Added support for Crontab, see #2509 (@keith-hall)

Bugfixes

• Bring back pre-processing of ANSI escape characters to so that some common bat use cases starts working again. See #2308 (@Enselic)

Features

• Make the default macOS theme depend on Dark Mode. See #2197, #1746 (@Enselic)
• Support for separate system and user config files. See #668 (@patrickpichler)

Bugfixes

• Prevent fork nightmare with PAGER=batcat. See #2235 (@johnmatthiggins)
• Make --no-paging/-P override --paging=... if passed as a later arg, see #2201 (@themkat)
• --map-syntax and --ignored-suffix now works together, see #2093 (@czzrr)
• Strips byte order mark from output when in non-loop-through mode. See #1922 (@dag-h)

Other

• Relaxed glibc requirements on amd64, see #2106 and #2194 (@sharkdp)
• Improved fish completions. See #2275 (@zgracem)
• Stop pre-processing ANSI escape characters. Syntax highlighting on ANSI escaped input is not supported. See #2185 and #2189 (@Enselic)

Syntaxes

• NSE (Nmap Scripting Engine) is mapped to Lua, see #2151 (@Cre3per)
• Correctly color fstab dump and pass fields, see #2246 (@yuvalmo)
• Update Command Help syntax, see #2255
• Julia: Fix syntax highlighting for function name starting with struct, see #2230
• Minor update to LiveScript, see #2291
• Associate .mts and .cts files with the TypeScript syntax. See #2236 (@kidonng)
• Fish history is mapped to YAML. See #2237 (@kidonng)

bat as a library

• Make bat::PrettyPrinter::syntaxes() iterate over new bat::Syntax struct instead of &syntect::parsing::SyntaxReference. See #2222 (@Enselic)
• Clear highlights after printing, see #1919 and #1920 (@rhysd)

Features

• Correctly render tab stops in --show-all, see #2038 (@Synthetica9)
• Add a --style=default option and make it the default. It is less verbose than full, see #2061 (@IsaacHorvath)
• Enable BusyBox less as pager, see #2162 (@nfisher1226)
• File extensions are now matched case-insensitively. See #1854, #2181 (@Enselic)

Bugfixes

• Bump regex dependency from 1.5.4 to 1.5.5 to fix CVE-2022-24713, see #2145, #2139 (@Enselic)
• bat no longer crashes when encountering files that references missing syntaxes. See #915, #2181 (@Enselic)

Performance

• Skip syntax highlighting on long lines (> 16384 chars) to help improve performance. See #2165 (@keith-hall)
• Vastly improve startup time by lazy-loading syntaxes via syntect 5.0.0. This makes bat display small files ~75% faster than before. See #951, #2181 (@Enselic)

Other

• Include info about custom assets in --diagnostics if used. See #2107, #2144 (@Enselic)

Syntaxes

• Mapped clang-format config file (.clang-format) to YAML syntax (@TruncatedDinosour)
• log syntax: improved handling of escape characters in double quoted strings. See #2123 (@keith-hall)
• Associate /var/spool/mail/* and /var/mail/* with the Email syntax. See #2156 (@cyqsimon)
• Added cmd-help syntax to scope --help messages. See #2148 (@victor-gp)
• Slightly adjust Zig syntax. See #2136 (@Enselic)
• Associate .inf files with the INI syntax. See #2190 (@Enselic)

bat as a library

• Allow configuration of show_nonprintable with PrettyPrinter, see #2142
• The binary format of syntaxes.bin has been changed due to syntaxes now being lazy-loaded via syntect 5.0.0. See #2181 (@Enselic)
• Mark bat::error::Error enum as #[non_exhaustive] to allow adding new variants without future semver breakage. See #2181 (@Enselic)
• Change Error::SyntectError(syntect::LoadingError) to Error::SyntectError(syntect::Error). See #2181 (@Enselic)
• Add Error::SyntectLoadingError(syntect::LoadingError) enum variant. See #2181 (@Enselic)

Features

• New style component header-filesize to show size of the displayed file in the header. See #1988 (@mdibaiee)
• Use underline for line highlighting on ANSI, see #1730 (@mdibaiee)

Bugfixes

• Fix bash completion on bash 3.x and bash-completion 1.x. See #2066 (@joshpencheon)

Syntaxes

• GraphQL: Add support for interfaces implementing interfaces and consider ampersand an operator. See #2000
• Associate _vimrc and _gvimrc files with the VimL syntax. See #2002
• Associate poetry.lock files with the TOML syntax. See #2049
• Associate .mesh, .task, .rgen, .rint, .rahit, .rchit, .rmiss, and .rcall with the GLSL syntax. See #2050
• Added support for JQ syntax, see #2072 (@clarfonthey)
• Properly associate global git config files rooted in $XDG_CONFIG_HOME/git/ or $HOME/.config/git/. See #2067 (@cyqsimon)

bat as a library

• Exposed get_syntax_set and get_theme methods on HighlightingAssets. See #2030 (@dandavison)
• Added HeaderFilename and HeaderFilesize to StyleComponent enum, and mark it #[non_exhaustive]. See #1988 (@mdibaiee)

Performance

• Reduce startup time in loop-through mode (e.g. when redirecting output) by 90%. See #1747 (@Enselic)
• Load themes lazily to make bat start 25% faster when disregarding syntax load time. See #1969 (@Enselic)
• Python syntax highlighting no longer suffers from abysmal performance in specific scenarios. See #1688 (@keith-hall)
• Fix for poor performance when ANSI escape sequences are piped to bat, see #1596 (@eth-p)
• Fix for incorrect handling of ANSI escape sequences when using --wrap=never, see #1596 (@eth-p)
• Load custom assets as fast as integrated assets, see #1753 (@Enselic)

Features

• Support for x:-delta (minus) syntax in line ranges (e.g. 20:-10). See #1901 (@bojan88)
• Support for --ignored-suffix argument. See #1892 (@bojan88)
• $BAT_CONFIG_DIR is now a recognized environment variable. It has precedence over $XDG_CONFIG_HOME, see #1727 (@billrisher)
• Support for x:+delta syntax in line ranges (e.g. 20:+10). See #1810 (@bojan88)
• Add new --acknowledgements option that gives credit to theme and syntax definition authors. See #1971 (@Enselic)
• Include git hash in bat -V and bat --version output if present. See #1921 (@Enselic)

Bugfixes

• First line not shown in diff context. See #1891 (@divagant-martian)
• Do not ignore syntaxes that handle file names with a *.conf extension. See #1703 (@cbolgiano)

Other

• Add PowerShell completion, see #1826 (@rashil2000)
• Minimum supported Rust version (MSRV) bumped to 1.51, see #1994 (@mdibaiee)

Syntaxes

• Groff, see #1685 (@scop)
• HTTP Requests and Responses, see #1748 (@keith-hall)
• LLVM, see #1777 (@ioncodes)
• Highlight for vimrc and gvimrc files, see #1763 (@SuperSandro2000)
• Syslog highlighting improvements, see #1793 (@scop)
• Added support for slim syntax, see #1693 (@mfinelli)
• Racket, see #1884 (@jubnzv)
• LiveScript, see #1915 (@Enselic)
• MediaWiki, see #1925 (@sorairolake)
• The requirements.txt syntax has been removed due to incompatible license requirements.
• Dart, new highlighter, see #1959 (@Ersikan)
• SCSS and Sass syntaxes updated, see #1766 (@Enselic)
• PowerShell syntax updated, see #1935 (@Enselic)
• TypeScript syntax updated, see #1834 (@Enselic)

bat as a library

• Deprecate HighlightingAssets::syntaxes() and HighlightingAssets::syntax_for_file_name(). Use HighlightingAssets::get_syntaxes() and HighlightingAssets::get_syntax_for_path() instead. They return a Result which is needed for upcoming lazy-loading work to improve startup performance. They also return which SyntaxSet the returned SyntaxReference belongs to. See #1747, #1755, #1776, #1862 (@Enselic)
• Remove HighlightingAssets::from_files and HighlightingAssets::save_to_cache. Instead of calling the former and then the latter you now make a single call to bat::assets::build. See #1802, #1971 (@Enselic)
• Replace the error::Error(error::ErrorKind, _) struct and enum with an error::Error enum. Error(ErrorKind::UnknownSyntax, _) becomes Error::UnknownSyntax, etc. Also remove the error::ResultExt trait. These changes stem from replacing error-chain with thiserror. See #1820 (@Enselic)
• Add new MappingTarget enum variant MapExtensionToUnknown. Refer to its documentation for more information. Also mark MappingTarget as #[non_exhaustive] since more enum variants might be added in the future. See #1703 (@cbolgiano), #2012 (@Enselic)