[Bug] Autocompletion for fish shell breaks with an error

When using the autocompletion for fish shell, an complete: Expected a string, but found an incomplete token error is raised.

Reproduction Rate

This bug occurs everytime the fish shell completions for tldr are loaded, which happens whenever autocompletion is triggered for the first time per session.

Steps to Reproduce

Using fish, type tldr and attempt to run autocompletion by pressing TAB.

# Switch to fish shell if you're not already using it.
$ fish

# Type tldr, a space, and then press tab.
$ tldr [TAB]

Result

$ tldr [TAB]complete: Completion 'tailscale unar ipaggcreate mupdf vimtutor doctl-balance head swift alex lpstat git-show-unmerged-branches particle doxygen bootctl go-version virsh-pool-delete d8 pdflatex pssh pkill jp2a git-clear-soft rtl_sdr swipl jigsaw iperf az-storage-entity docker-ps arp exiv2 cmp dexdump git-release odps mlr mysqld deluge-console puppet-apply git-contrib mongoimport ps dotnet-tool nu stow dolt-clone pdffonts http az-login git-sizer mkvmerge circo fc-match gdrive pio-check aws-secretsmanager jhsdb rails-destroy sendmail [ pueue-completions pnpx zoxide mycli goreload stat az-feedback z sshpass hg-clone runit cosign sops pio-ci svgo stack montage mocha jtbl tr nm httprobe qtcreator slimrb consul-kv pueue-shutdown bundletool-validate pretty-bytes gh-mintty blackfire conda-create gpg-zip eva vimdiff last sccmap gcc exiftool cradle-elastic django-admin puppet ranger spfquery xkcdpass pycodestyle docker-machine gist ulimit git-filter-repo buku vue-init zless zola git-graft minisign keychain hunspell docker-inspect newman az-storage trawl fly psql joe kotlin pueue-follow ping6 sleep cola newsboat find gox license git-pull nvim ogrmerge.py rails spark firebase pio-home gdb git-reset k8sec gh-secret hostapd docker-commit az-network kube-capacity make hg-remove f3fix phive git-bugreport case strip-nondeterminism forever pgbench pickle peludna-prognoza lzop git-gc assimp pueue-send xdelta complete diff virsh-connect pueue-restart speedtest runsvchdir bower git-abort yq scan-build obs netlify grunt chsh atq viu passwd cvs ar wrk az-storage-blob pdfinfo nvm.fish whois steamcmd twm mu git-diff-files tpp react-native drill envoy ansible-vault googler git-symbolic-ref wrangler magick nice mullvad vim var-dump-server dvc-diff husky sk jmap mmv gacutil az-appconfig cbonsai basename mdp zm unlink ngs touch doctl-account nativefier scalafmt skicka go factor tlmgr-arch gobuster zpool repren rclone git-update-ref go-vet brotli monodis bzgrep git-imerge 2to3 az-config npm-home llvm-g++ delta iex git-rename-branch ipfs pic dog nload grpcurl clockwork-cli git-reset-file python trans ldapsearch xml-edit maza zsteg [[ gpg consul mmdc whoami git-var git-fame virsh-pool-list hive shellcheck git-range-diff cloc peco hg-branch indent docker-save az-logout nmap dolt-commit git-stash more dua php-yii colorls calendar git-count-objects wapm ctest sox hsd-cli iotop phan phing xml-transform sc-im virsh-pool-start svgr git-rev-list notmuch ocamlfind ionice git-show emacs declare csvstat mosquitto_pub duplicacy chromium pinta flake8 etcd socat gitlint zip calibredb clang-cpp spike zfs pueue-pause bw pv xh jobs xplr runsv smartctl git-checkout daps llvm-gcc mongodump mkdir unclutter cdk hg-commit lt dolt-branch popd lambo docker-stats rr xml-pyx msbuild pushd logstash doctl-auth wat2wasm jq aws-quicksight xml-format airmon-ng subl git-commit-graph dvc-freeze tslint vala nano git-difftool phpcpd while git-rev-parse thunderbird composer-require-checker nasm bosh pwd x_x chezmoi tlmgr-install ipcs git-repack swc nix-env geth uniq false lmms gradle gh-api virsh-pool-define-as ghci acme.sh-dns git-daemon rustc kompose guacd git-column magento split okular kill gpg-tui glab-issue gitmoji git-rename-remote grip transcrypt mkfifo openssl-s_client glab-mr go-generate git-worktree pueue-group pueue-edit kubens vault uvicorn ipython git-cherry-pick docker-network tlmgr-candidates rubocop chars mozillavpn git-sync keybase gatsby lwp-request uncrustify cotton meson trivy git-notes 7zr apm git-ls-tree qutebrowser git-shortlog fuck nop pr javac vue-serve gnucash-cli astronomer babel pueue recsel asar img2pdf act aws-glue csvsql sv wasm2c netstat terragrunt tmpmail sublist3r nimble lolcat git-status starship-init comby deluge shift gunicorn xgettext gh-workflow satis decaffeinate view x11docker todoist distccd tbl virsh-pool-autostart vladimyr gopass cpio kubectl-logs qr neato nl ts git-check-ref-format oathtool pathchk trap sn zek pageres lp sha256sum psysh nim g++ git-missing yarn pax git-request-pull darkhttpd fdupes tcpdump ts-node autossh elixir amass-enum nginx ghdl p7zip minifab heroku git-brv testssl scc xml-unescape git-commit-tree fkill file glances sshd dig gh-auth pixiecore pdftex clojure qdbus b2sum glab-auth xetex banner scrapy xargs expand gtop kops mongorestore strings restic git-subtree fluxctl adb goimports virsh-list sshuttle virt-sysprep progpilot protector xxd pyenv you-get minetestserver uptime ykman mogrify fakedata gitlab-ctl scheme m4 aws-iam transmission-cli ss-local adb-shell eqn pg_restore xcaddy direnv borg rector watchexec qemu git-whatchanged mutt fish ksh crunch bshell pio-team scp pdftk gotty compare standard-version dotnet fc-pattern atoum git-fetch git-revert jetifier transfersh caddy mh_metric openscad sup r2 zbarimg traceroute steam grumphp rvm atom fastlane srm py-spy sfdp st-util cradle-deploy git-ls-files doctum parallel-lint deemix docker-login fls source git-for-each-repo tuir surfraw git-effort todoman pio-test phpcs ftp bastet dvc-unfreeze shards mpg321 virsh 7za timetrap tox xml-canonic tailscale-file date mosquitto locust llvm-config git-instaweb popeye zig mc zmore tac radare2 ignite swig pio-platform hg-update git-delete-tag dvc-fetch reflac go-tool omf go-env virt-sparsify nvidia-smi sdkmanager git-verify-commit echo ng pueue-log diffstat omz scala wget ogr2ogr zipgrep hostid if gxl2gv finger nkf virtualenvwrapper next cd sponge git-annex cmark git-ignore vue bandwhich odps-resource oc croc dolt-blame history expr jupyter redis-server stolonctl fin cryfs mscore dillo lebab grex git-tag read autopep8 nslookup git-cp mysql qrencode sonar-scanner fping bmaptool leave mutagen git-merge velero git-obliterate seq xml-validate docker-slim git-flow jwt ping badblocks pueue-switch typeset doctl-apps clifm virsh-pool-build glab-mr-merge lambo-new git-credential aws-ses vue-build autoflake zcat git-show-merged-branches cwebp asciinema nokogiri kdig sbt avrdude git-rm 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docker-inspect newman az-storage trawl fly psql joe kotlin pueue-follow ping6 sleep cola newsboat find gox license git-pull nvim ogrmerge.py rails spark firebase pio-home gdb git-reset k8sec gh-secret hostapd docker-commit az-network kube-capacity make hg-remove f3fix phive git-bugreport case strip-nondeterminism forever pgbench pickle peludna-prognoza lzop git-gc assimp pueue-send xdelta complete diff virsh-connect pueue-restart speedtest runsvchdir bower git-abort yq scan-build obs netlify grunt chsh atq viu passwd cvs ar wrk az-storage-blob pdfinfo nvm.fish whois steamcmd twm mu git-diff-files tpp react-native drill envoy ansible-vault googler git-symbolic-ref wrangler magick nice mullvad vim var-dump-server dvc-diff husky sk jmap mmv gacutil az-appconfig cbonsai basename mdp zm unlink ngs touch doctl-account nativefier scalafmt skicka go factor tlmgr-arch gobuster zpool repren rclone git-update-ref go-vet brotli monodis bzgrep git-imerge 2to3 az-config npm-home llvm-g++ delta iex git-rename-branch ipfs pic dog nload grpcurl clockwork-cli git-reset-file python trans ldapsearch xml-edit maza zsteg [[ gpg consul mmdc whoami git-var git-fame virsh-pool-list hive shellcheck git-range-diff cloc peco hg-branch indent docker-save az-logout nmap dolt-commit git-stash more dua php-yii colorls calendar git-count-objects wapm ctest sox hsd-cli iotop phan phing xml-transform sc-im virsh-pool-start svgr git-rev-list notmuch ocamlfind ionice git-show emacs declare csvstat mosquitto_pub duplicacy chromium pinta flake8 etcd socat gitlint zip calibredb clang-cpp spike zfs pueue-pause bw pv xh jobs xplr runsv smartctl git-checkout daps llvm-gcc mongodump mkdir unclutter cdk hg-commit lt dolt-branch popd lambo docker-stats rr xml-pyx msbuild pushd logstash doctl-auth wat2wasm jq aws-quicksight xml-format airmon-ng subl git-commit-graph dvc-freeze tslint vala nano git-difftool phpcpd while git-rev-parse thunderbird composer-require-checker nasm bosh pwd x_x chezmoi tlmgr-install ipcs git-repack swc nix-env geth uniq false lmms gradle gh-api virsh-pool-define-as ghci acme.sh-dns git-daemon rustc kompose guacd git-column magento split okular kill gpg-tui glab-issue gitmoji git-rename-remote grip transcrypt mkfifo openssl-s_client glab-mr go-generate git-worktree pueue-group pueue-edit kubens vault uvicorn ipython git-cherry-pick docker-network tlmgr-candidates rubocop chars mozillavpn git-sync keybase gatsby lwp-request uncrustify cotton meson trivy git-notes 7zr apm git-ls-tree qutebrowser git-shortlog fuck nop pr javac vue-serve gnucash-cli astronomer babel pueue recsel asar img2pdf act aws-glue csvsql sv wasm2c netstat terragrunt tmpmail sublist3r nimble lolcat git-status starship-init comby deluge shift gunicorn xgettext gh-workflow satis decaffeinate view x11docker todoist distccd tbl virsh-pool-autostart vladimyr gopass cpio kubectl-logs qr neato nl ts git-check-ref-format oathtool pathchk trap sn zek pageres lp sha256sum psysh nim g++ git-missing yarn pax 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bastet dvc-unfreeze shards mpg321 virsh 7za timetrap tox xml-canonic tailscale-file date mosquitto locust llvm-config git-instaweb popeye zig mc zmore tac radare2 ignite swig pio-platform hg-update git-delete-tag dvc-fetch reflac go-tool omf go-env virt-sparsify nvidia-smi sdkmanager git-verify-commit echo ng pueue-log diffstat omz scala wget ogr2ogr zipgrep hostid if gxl2gv finger nkf virtualenvwrapper next cd sponge git-annex cmark git-ignore vue bandwhich odps-resource oc croc dolt-blame history expr jupyter redis-server stolonctl fin cryfs mscore dillo lebab grex git-tag read autopep8 nslookup git-cp mysql qrencode sonar-scanner fping bmaptool leave mutagen git-merge velero git-obliterate seq xml-validate docker-slim git-flow jwt ping badblocks pueue-switch typeset doctl-apps clifm virsh-pool-build glab-mr-merge lambo-new git-credential aws-ses vue-build autoflake zcat git-show-merged-branches cwebp asciinema nokogiri kdig sbt avrdude git-rm llvm-objdump az-account git-secret helm 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^{[TAB] represents pressing the tab key and is not actually visible. $ is the prompt, tldr [TAB] is user input, and the rest is error output.}

Expected Result

The expected result is that the fish shell autocompletion script does not cause an error, like so:

$ tldr [TAB]
2to3                        lerna
7z                          less
7za                         lex
7zr                         license
…and 1080 more rows

^{[TAB] represents pressing the tab key and is not actually visible. $ is the prompt, tldr [TAB] is user input, and the rest is output.}

Additional Information

I am running macOS 12.4 and using fish shell.
The problematic code is installed at $(brew --prefix)/var/homebrew/linked/tldr/share/fish/vendor_completions.d/tldr.fish. The code in this repository that is relevant is autocomplete/complete.fish.
~~This bug was caused by https://github.com/tldr-pages/tldr/pull/5205 and~~ https://github.com/tldr-pages/tldr/pull/7530, which added tldr pages for ~~[ and~~ [[~~, respectfully~~. However, the names of the file~~s [.md and~~ [[.md broke the fish autocompletion as written in #17.
I have already made #86, which fixes this issue and makes additional improvements to fish shell completion.

tldr-pages / tldr-c-client