Mark if-let and when-let obsolete

* lisp/subr.el (if-let*, when-let*, if-let, when-let): Mark
if-let and when-let obsolete (bug#73853 and elsewhere).  Move
docstring text around so that if-let* and when-let* descriptions
no longer refer to if-let and when-let.

* etc/NEWS: Announce the change.

* admin/admin.el (reminder-for-release-blocking-bugs):
* doc/misc/erc.texi (display-buffer):
* lisp/ansi-color.el (ansi-color-apply)
(ansi-color--face-vec-face):
* lisp/ansi-osc.el (ansi-osc-apply-on-region)
(ansi-osc-hyperlink):
* lisp/arc-mode.el (archive-goto-file)
(archive-next-file-displayer):
* lisp/auth-source-pass.el (auth-source-pass-search)
(auth-source-pass--parse-data)
(auth-source-pass--find-match-many):
* lisp/autorevert.el (auto-revert-notify-rm-watch):
* lisp/buff-menu.el (Buffer-menu-unmark-all-buffers)
(Buffer-menu-group-by-root):
* lisp/calendar/parse-time.el (parse-iso8601-time-string):
* lisp/cedet/pulse.el (pulse-tick):
* lisp/comint.el (comint--fontify-input-ppss-flush-indirect)
(comint--intersect-regions):
* lisp/completion-preview.el (completion-preview--try-table)
(completion-preview--capf-wrapper, completion-preview--update):
* lisp/cus-edit.el (setopt--set)
(custom-dirlocals-maybe-update-cons, custom-dirlocals-validate):
* lisp/custom.el (load-theme):
* lisp/descr-text.el (describe-char):
* lisp/desktop.el (desktop--emacs-pid-running-p):
* lisp/dired-x.el (menu):
* lisp/dired.el (dired-font-lock-keywords)
(dired-insert-directory, dired--insert-disk-space, dired-mode):
* lisp/dnd.el (dnd-handle-multiple-urls):
* lisp/dom.el (dom-remove-attribute):
* lisp/emacs-lisp/byte-opt.el (byte-optimize-form-code-walker):
* lisp/emacs-lisp/bytecomp.el (bytecomp--custom-declare):
* lisp/emacs-lisp/comp-common.el (comp-function-type-spec):
* lisp/emacs-lisp/comp-cstr.el (comp--all-classes)
(comp-cstr-set-range-for-arithm, comp--cstr-union-1-no-mem)
(comp-cstr-intersection-no-mem, comp-cstr-fixnum-p)
(comp-cstr-type-p):
* lisp/emacs-lisp/comp-run.el (comp-subr-trampoline-install)
(native--compile-async):
* lisp/emacs-lisp/comp.el (comp--get-function-cstr)
(comp--function-pure-p, comp--intern-func-in-ctxt)
(comp--addr-to-bb-name, comp--emit-assume, comp--maybe-add-vmvar)
(comp--add-call-cstr, comp--compute-dominator-tree)
(comp--dom-tree-walker, comp--ssa-rename)
(comp--function-call-maybe-fold, comp--fwprop-call)
(comp--call-optim-func):
* lisp/emacs-lisp/edebug.el (edebug-global-prefix)
(edebug-remove-instrumentation):
* lisp/emacs-lisp/eieio.el (initialize-instance):
* lisp/emacs-lisp/ert-x.el (ert-resource-directory):
* lisp/emacs-lisp/ert.el (ert--expand-should-1)
(ert-test-location, ert-write-junit-test-report)
(ert-test--erts-test):
* lisp/emacs-lisp/icons.el (icon-complete-spec, icon-string)
(icons--create):
* lisp/emacs-lisp/lisp-mode.el (lisp--local-defform-body-p):
* lisp/emacs-lisp/loaddefs-gen.el
(loaddefs-generate--make-autoload)
(loaddefs-generate--parse-file):
* lisp/emacs-lisp/multisession.el
(multisession-edit-mode--revert, multisession-edit-value):
* lisp/emacs-lisp/package-vc.el (package-vc--read-archive-data)
(package-vc--version, package-vc--clone):
* lisp/emacs-lisp/package.el (package--reload-previously-loaded):
* lisp/emacs-lisp/pp.el (pp--insert-lisp):
* lisp/emacs-lisp/subr-x.el (add-display-text-property):
* lisp/emacs-lisp/tabulated-list.el (tabulated-list-print):
* lisp/emacs-lisp/timer.el (run-at-time):
* lisp/emacs-lisp/vtable.el (vtable-goto-table)
(vtable-goto-column, vtable-update-object, vtable--insert-line)
(vtable--compute-widths, vtable--make-keymap):
* lisp/emacs-lisp/warnings.el (display-warning):
* lisp/epa-file.el (epa-file-insert-file-contents):
* lisp/epa.el (epa-show-key):
* lisp/erc/erc-backend.el (erc--split-line, erc--conceal-prompt)
(PRIVMSG, erc--get-isupport-entry):
* lisp/erc/erc-button.el (erc-button-add-nickname-buttons)
(erc--button-next):
* lisp/erc/erc-common.el (erc--find-group):
* lisp/erc/erc-fill.el (erc-fill, erc-fill-static)
(erc-fill--wrap-escape-hidden-speaker)
(erc-fill--wrap-unmerge-on-date-stamp)
(erc-fill--wrap-massage-initial-message-post-clear)
(erc-fill-wrap, erc-fill--wrap-rejigger-region):
* lisp/erc/erc-goodies.el (erc--scrolltobottom-all)
(erc--keep-place-indicator-on-window-buffer-change)
(keep-place-indicator, erc--keep-place-indicator-adjust-on-clear)
(erc-keep-place-move, erc--command-indicator-display):
* lisp/erc/erc-ibuffer.el (erc-members):
* lisp/erc/erc-join.el (erc-join--remove-requested-channel)
(erc-autojoin--join):
* lisp/erc/erc-networks.el
(erc-networks--id-qualifying-init-parts, erc-networks--id-reload)
(erc-networks--id-ensure-comparable)
(erc-networks--reclaim-orphaned-target-buffers)
(erc-networks--server-select):
* lisp/erc/erc-nicks.el (erc-nicks-invert)
(erc-nicks--redirect-face-widget-link, erc-nicks--highlight)
(erc-nicks--highlight-button)
(erc-nicks--list-faces-help-button-action, erc-nicks-list-faces)
(erc-nicks-refresh, erc-nicks--colors-from-faces)
(erc-nicks--track-prioritize)
(erc-nicks--remember-face-for-track):
* lisp/erc/erc-notify.el (querypoll, erc--querypoll-get-next)
(erc--querypoll-on-352, erc--querypoll-send):
* lisp/erc/erc-sasl.el (erc-sasl--read-password):
* lisp/erc/erc-services.el
(erc-services-issue-ghost-and-retry-nick):
* lisp/erc/erc-speedbar.el (erc-speedbar--ensure, nickbar)
(erc-speedbar-toggle-nicknames-window-lock)
(erc-speedbar--compose-nicks-face):
* lisp/erc/erc-stamp.el (erc-stamp--recover-on-reconnect)
(erc-stamp-prefix-log-filter, erc--conceal-prompt)
(erc--insert-timestamp-left, erc-insert-timestamp-right)
(erc-stamp--defer-date-insertion-on-post-modify)
(erc-insert-timestamp-left-and-right)
(erc-stamp--redo-right-stamp-post-clear)
(erc-stamp--reset-on-clear, erc-stamp--dedupe-date-stamps):
* lisp/erc/erc-status-sidebar.el (bufbar)
(erc-status-sidebar-prefer-target-as-name)
(erc-status-sidebar-default-allsort, erc-status-sidebar-click):
* lisp/erc/erc-track.el (erc-track--shortened-names-get)
(erc-track--setup, erc-track--select-mode-line-face)
(erc-track-modified-channels, erc-track--collect-faces-in)
(erc-track--switch-buffer, erc-track--replace-killed-buffer):
* lisp/erc/erc-truncate.el (erc-truncate--setup)
(erc-truncate-buffer):
* lisp/erc/erc.el (erc--ensure-query-member)
(erc--ensure-query-members, erc--remove-channel-users-but)
(erc--cusr-change-status, erc--find-mode, erc--update-modules)
(erc-log-irc-protocol, erc--refresh-prompt)
(erc--restore-important-text-props)
(erc--order-text-properties-from-hash, erc-send-input-line)
(erc-cmd-IGNORE, erc--unignore-user, erc-cmd-QUERY)
(erc-cmd-BANLIST, erc--speakerize-nick)
(erc--format-speaker-input-message, erc-channel-receive-names)
(erc-send-current-line, erc-format-target-and/or-network)
(erc-kill-buffer-function, erc-restore-text-properties)
(erc--get-eq-comparable-cmd):
* lisp/eshell/em-alias.el (eshell-maybe-replace-by-alias--which)
(eshell-maybe-replace-by-alias):
* lisp/eshell/em-glob.el (eshell-glob-convert):
* lisp/eshell/em-pred.el (eshell-pred-user-or-group)
(eshell-pred-file-time, eshell-pred-file-type)
(eshell-pred-file-mode, eshell-pred-file-links)
(eshell-pred-file-size):
* lisp/eshell/em-prompt.el (eshell-forward-paragraph)
(eshell-next-prompt):
* lisp/eshell/esh-arg.el (eshell-resolve-current-argument):
* lisp/eshell/esh-cmd.el (eshell-do-eval, eshell/which)
(eshell-plain-command--which, eshell-plain-command):
* lisp/eshell/esh-io.el (eshell-duplicate-handles)
(eshell-protect-handles, eshell-get-target, eshell-close-target):
* lisp/eshell/esh-proc.el (eshell-sentinel):
* lisp/eshell/esh-var.el (eshell-parse-variable-ref)
(eshell-get-variable, eshell-set-variable):
* lisp/faces.el (face-at-point):
* lisp/ffap.el (ffap-in-project):
* lisp/filenotify.el (file-notify--rm-descriptor):
* lisp/files-x.el (read-dir-locals-file)
(connection-local-update-profile-variables)
(connection-local-value):
* lisp/files.el (file-remote-p, abbreviate-file-name)
(set-auto-mode, hack-local-variables)
(revert-buffer-restore-read-only):
* lisp/find-dired.el (find-dired-sort-by-filename):
* lisp/font-lock.el (font-lock--filter-keywords):
* lisp/gnus/gnus-art.el (article-emojize-symbols):
* lisp/gnus/gnus-int.el (gnus-close-server):
* lisp/gnus/gnus-search.el (gnus-search-transform)
(gnus-search-indexed-parse-output, gnus-search-server-to-engine):
* lisp/gnus/gnus-sum.el (gnus-collect-urls, gnus-shorten-url):
* lisp/gnus/gnus.el (gnus-check-backend-function):
* lisp/gnus/message.el (message-send-mail):
* lisp/gnus/mml.el (mml-generate-mime, mml-insert-mime-headers):
* lisp/gnus/nnatom.el (nnatom--read-feed, nnatom--read-article)
(nnatom--read-article-or-group-authors, nnatom--read-publish)
(nnatom--read-update, nnatom--read-links):
* lisp/gnus/nnfeed.el (nnfeed--read-server, nnfeed--write-server)
(nnfeed--parse-feed, nnfeed--group-data, nnfeed-retrieve-article)
(nnfeed-retrieve-headers, nnfeed--print-part)
(nnfeed-request-article, nnfeed-request-group)
(nnfeed-request-list, nnfeed--group-description)
(nnfeed-request-group-description)
(nnfeed-request-list-newsgroups, nnfeed-request-rename-group):
* lisp/gnus/nnmh.el (nnmh-update-gnus-unreads):
* lisp/help-fns.el (help-find-source)
(help-fns--insert-menu-bindings, help-fns--mention-first-release)
(help-fns--mention-shortdoc-groups)
(help-fns--customize-variable-version)
(help-fns--face-custom-version-info, describe-mode):
* lisp/help-mode.el (help-make-xrefs):
* lisp/help.el (help-key-description, help--describe-command):
* lisp/hfy-cmap.el (htmlfontify-load-rgb-file):
* lisp/ibuf-ext.el (ibuffer-jump-to-filter-group)
(ibuffer-kill-filter-group, ibuffer-kill-line)
(ibuffer-save-filter-groups, ibuffer-save-filters, filename)
(basename, file-extension, ibuffer-diff-buffer-with-file-1)
(ibuffer-mark-by-file-name-regexp)
(ibuffer-mark-by-content-regexp):
* lisp/ibuf-macs.el (ibuffer-aif, ibuffer-awhen):
* lisp/ibuffer.el (ibuffer-mouse-toggle-mark)
(ibuffer-toggle-marks, ibuffer-mark-interactive)
(ibuffer-compile-format, process, ibuffer-map-lines):
* lisp/image.el (image--compute-map)
(image--compute-original-map):
* lisp/image/exif.el (exif-parse-buffer):
* lisp/image/image-converter.el (image-convert-p, image-convert)
(image-converter--find-converter):
* lisp/image/image-dired-util.el
(image-dired-file-name-at-point):
* lisp/image/image-dired.el (image-dired-track-original-file)
(image-dired--on-file-in-dired-buffer)
(image-dired--with-thumbnail-buffer)
(image-dired-jump-original-dired-buffer)
(image-dired--slideshow-step, image-dired-display-image):
* lisp/image/wallpaper.el (wallpaper--init-action-kill)
(wallpaper--find-setter, wallpaper--find-command)
(wallpaper--find-command-args, wallpaper--x-monitor-name):
* lisp/info-look.el (info-lookup-interactive-arguments)
(info-complete)::(:mode):
* lisp/info.el (info-pop-to-buffer, Info-read-node-name-1):
* lisp/international/emoji.el (emoji--adjust-displayable-1)
(emoji--add-recent):
* lisp/jsonrpc.el (jsonrpc--call-deferred)
(jsonrpc--process-sentinel, jsonrpc--remove):
* lisp/keymap.el (keymap-local-lookup):
* lisp/mail/emacsbug.el (report-emacs-bug-hook)
(submit-emacs-patch):
* lisp/mail/ietf-drums.el (ietf-drums-parse-addresses):
* lisp/mail/mailclient.el (mailclient-send-it):
* lisp/mail/rfc6068.el (rfc6068-parse-mailto-url):
* lisp/mail/undigest.el (rmail-digest-parse-mixed-mime):
* lisp/minibuffer.el (completion-metadata-get)
(completions--after-change)
(minibuffer-visible-completions--filter):
* lisp/net/browse-url.el (browse-url-url-at-point)
(browse-url-file-url, browse-url-emacs):
* lisp/net/dbus.el (dbus-byte-array-to-string)
(dbus-monitor-goto-serial):
* lisp/net/dictionary.el (dictionary-search):
* lisp/net/eww.el (eww--download-directory)
(eww-auto-rename-buffer, eww-open-in-new-buffer, eww-submit)
(eww-follow-link, eww-read-alternate-url)
(eww-copy-alternate-url):
* lisp/net/goto-addr.el (goto-address-at-point):
* lisp/net/mailcap.el (mailcap-mime-info):
* lisp/net/rcirc.el (rcirc, rcirc-connect, rcirc-send-string)
(rcirc-kill-buffer-hook, rcirc-print, rcirc-when)
(rcirc-color-attributes, rcirc-handler-NICK)
(rcirc-handler-TAGMSG, rcirc-handler-BATCH):
* lisp/net/shr.el (shr-descend, shr-adaptive-fill-function)
(shr-correct-dom-case, shr-tag-a):
* lisp/net/sieve.el (sieve-manage-quit):
* lisp/outline.el (outline-cycle-buffer):
* lisp/pcmpl-git.el (pcmpl-git--tracked-file-predicate):
* lisp/proced.el (proced-auto-update-timer):
* lisp/progmodes/bug-reference.el
(bug-reference-try-setup-from-vc):
* lisp/progmodes/c-ts-common.el (c-ts-common--fill-paragraph):
* lisp/progmodes/c-ts-mode.el (c-ts-mode--preproc-offset)
(c-ts-mode--anchor-prev-sibling, c-ts-mode-indent-defun):
* lisp/progmodes/compile.el (compilation-error-properties)
(compilation-find-file-1):
* lisp/progmodes/eglot.el (eglot--check-object)
(eglot--read-server, eglot-upgrade-eglot)
(eglot-handle-notification, eglot--CompletionParams)
(eglot-completion-at-point, eglot--sig-info)
(eglot-register-capability):
* lisp/progmodes/elisp-mode.el
(emacs-lisp-native-compile-and-load)
(elisp-eldoc-var-docstring-with-value):
* lisp/progmodes/erts-mode.el (erts-mode--goto-start-of-test):
* lisp/progmodes/flymake.el (flymake--update-eol-overlays)
(flymake-eldoc-function):
* lisp/progmodes/gdb-mi.el (gdb-breakpoints-list-handler-custom)
(gdb-frame-handler):
* lisp/progmodes/go-ts-mode.el (go-ts-mode-docstring)
(go-ts-mode--comment-on-previous-line-p)
(go-ts-mode--get-test-regexp-at-point)
(go-ts-mode-test-this-file):
* lisp/progmodes/grep.el (lgrep, rgrep-default-command)
(grep-file-at-point):
* lisp/progmodes/perl-mode.el (perl--end-of-format-p):
* lisp/progmodes/php-ts-mode.el
(php-ts-mode--anchor-prev-sibling, php-ts-mode--indent-defun):
* lisp/progmodes/project.el (project--other-place-command)
(project--find-default-from, project--transplant-file-name)
(project-prefixed-buffer-name, project--remove-from-project-list)
(project-prompt-project-name, project-remember-projects-under)
(project--switch-project-command)
(project-uniquify-dirname-transform, project-mode-line-format):
* lisp/progmodes/python.el
(python-font-lock-keywords-maximum-decoration)
(python--treesit-fontify-union-types)
(python-shell-get-process-name, python-shell-restart)
(python-shell-completion-at-point, python-ffap-module-path)
(python-util-comint-end-of-output-p, python--import-sources)
(python-add-import, python-remove-import, python-fix-imports):
* lisp/progmodes/xref.el (xref--add-log-current-defun):
* lisp/repeat.el (repeat-echo-message-string):
* lisp/saveplace.el (save-place-dired-hook):
* lisp/server.el (server-save-buffers-kill-terminal):
* lisp/shadowfile.el (shadow-make-fullname)
(shadow-contract-file-name, shadow-define-literal-group):
* lisp/shell.el (shell-highlight-undef-mode):
* lisp/simple.el (command-completion-using-modes-p)
(command-execute, file-user-uid, file-group-gid)
(first-completion, last-completion, switch-to-completions):
* lisp/startup.el (startup--load-user-init-file):
* lisp/tab-line.el (tab-line-tabs-buffer-group-by-project):
* lisp/tar-mode.el (tar-goto-file, tar-next-file-displayer):
* lisp/term/android-win.el (android-encode-select-string)
(gui-backend-set-selection):
* lisp/term/haiku-win.el (haiku-dnd-convert-string)
(haiku-select-encode-xstring, haiku-select-encode-utf-8-string):
* lisp/textmodes/emacs-news-mode.el (emacs-news--buttonize):
* lisp/textmodes/ispell.el (ispell-completion-at-point):
* lisp/textmodes/sgml-mode.el (sgml-validate)
(html-mode--complete-at-point):
* lisp/textmodes/tex-mode.el (tex-recenter-output-buffer)
(xref-backend-references):
* lisp/thingatpt.el (thing-at-point-file-at-point)
(thing-at-point-face-at-point):
* lisp/thread.el (thread-list--get-status):
* lisp/time.el (world-clock-copy-time-as-kill, world-clock):
* lisp/touch-screen.el (touch-screen-handle-touch):
* lisp/treesit.el (treesit-language-at, treesit-node-at)
(treesit-node-on, treesit-buffer-root-node)
(treesit-node-field-name, treesit-local-parsers-at)
(treesit-local-parsers-on, treesit--cleanup-local-range-overlays)
(treesit-font-lock-recompute-features)
(treesit-font-lock-fontify-region, treesit-transpose-sexps)
(treesit-add-log-current-defun, treesit-major-mode-setup)
(treesit--explorer-refresh, treesit-install-language-grammar):
* lisp/url/url.el (url-retrieve-synchronously):
* lisp/vc/smerge-mode.el (smerge-diff):
* lisp/vc/vc-dir.el (vc-dir):
* lisp/vc/vc-dispatcher.el (vc-do-async-command):
* lisp/vc/vc-git.el (vc-git-dir--branch-headers)
(vc-git-dir--stash-headers, vc-git--log-edit-summary-check)
(vc-git-stash-list):
* lisp/vc/vc.el (vc-responsible-backend, vc-buffer-sync-fileset)
(vc-clone):
* lisp/visual-wrap.el (visual-wrap--apply-to-line):
* lisp/wid-edit.el (widget-text)
(widget-editable-list-insert-before):
* lisp/window-tool-bar.el
(window-tool-bar--keymap-entry-to-string):
* lisp/window.el (display-buffer, display-buffer-full-frame)
(window-point-context-set, window-point-context-use)
(window-point-context-use-default-function):
* lisp/xdg.el (xdg-current-desktop):
* lisp/xwidget.el (xwidget-webkit-callback):
* lisp/yank-media.el (yank-media--get-selection)
(yank-media-types):
* test/lisp/comint-tests.el
(comint-tests/test-password-function):
* test/lisp/completion-preview-tests.el
(completion-preview-tests--capf):
* test/lisp/cus-edit-tests.el (with-cus-edit-test):
* test/lisp/erc/erc-scenarios-base-local-modules.el
(-phony-sblm-):
* test/lisp/erc/erc-scenarios-stamp.el
(erc-scenarios-stamp--on-post-modify):
* test/lisp/erc/erc-services-tests.el
(erc-services-tests--asp-parse-entry):
* test/lisp/erc/erc-tests.el (erc-modules--internal-property)
(erc--find-mode, erc-tests--update-modules):
* test/lisp/erc/resources/erc-d/erc-d-i.el
(erc-d-i--parse-message):
* test/lisp/erc/resources/erc-d/erc-d-t.el
(erc-d-t-kill-related-buffers, erc-d-t-with-cleanup):
* test/lisp/erc/resources/erc-d/erc-d-tests.el
(erc-d-i--parse-message--irc-parser-tests):
* test/lisp/erc/resources/erc-d/erc-d-u.el
(erc-d-u--read-exchange-slowly):
* test/lisp/erc/resources/erc-d/erc-d.el (erc-d--expire)
(erc-d--finalize-done, erc-d--command-handle-all):
* test/lisp/erc/resources/erc-scenarios-common.el
(erc-scenarios-common-with-cleanup):
* test/lisp/erc/resources/erc-tests-common.el
(erc-tests--common-display-message)
(erc-tests-common-create-subprocess):
* test/lisp/ibuffer-tests.el (ibuffer-test-Bug25058):
* test/lisp/international/mule-tests.el
(mule-cmds-tests--ucs-names-missing-names):
* test/lisp/progmodes/python-tests.el
(python-tests-get-shell-interpreter)
(python-tests--get-interpreter-info):
* test/lisp/progmodes/ruby-ts-mode-tests.el
(ruby-ts-resource-file):
* test/lisp/replace-tests.el (replace-tests-with-undo):
* test/src/emacs-tests.el (emacs-tests--seccomp-debug):
* test/src/process-tests.el (process-tests--emacs-command)
(process-tests--emacs-binary, process-tests--dump-file):
* test/src/treesit-tests.el (treesit--ert-test-defun-navigation):
Replace use of the now-obsolete if-let and when-let.

lisp/image/exif.el

@@ -127,10 +127,10 @@ from the return value of this function."
               (encode-coding-region (point-min) (point-max)
                                     buffer-file-coding-system
                                     dest))
-            (when-let ((app1 (cdr (assq #xffe1 (exif--parse-jpeg)))))
+            (when-let* ((app1 (cdr (assq #xffe1 (exif--parse-jpeg)))))
               (exif--parse-exif-chunk app1))))
       (save-excursion
-        (when-let ((app1 (cdr (assq #xffe1 (exif--parse-jpeg)))))
+        (when-let* ((app1 (cdr (assq #xffe1 (exif--parse-jpeg)))))
           (exif--parse-exif-chunk app1))))))
 
 (defun exif-field (field data)

lisp/image/image-converter.el

@@ -85,7 +85,7 @@ like \"image/gif\"."
   (image-converter-initialize)
   ;; When image-converter was customized
   (when (and image-converter (not image-converter-regexp))
-    (when-let ((formats (image-converter--probe image-converter)))
+    (when-let* ((formats (image-converter--probe image-converter)))
       (setq image-converter-regexp
             (concat "\\." (regexp-opt formats) "\\'"))
       (setq image-converter-file-name-extensions formats)))
@@ -136,8 +136,8 @@ converted image data as a string."
            (extra-converter (gethash type image-converter--extra-converters)))
       (if extra-converter
           (funcall extra-converter source format)
-        (when-let ((err (image-converter--convert
-                         image-converter source format)))
+        (when-let* ((err (image-converter--convert
+                          image-converter source format)))
           (error "%s" err))))
     (if (listp image)
         ;; Return an image object that's the same as we were passed,
@@ -217,8 +217,8 @@ converted image data as a string."
   "Find an installed image converter Emacs can use."
   (catch 'done
     (dolist (elem image-converter--converters)
-      (when-let ((formats (image-converter--filter-formats
-                           (image-converter--probe (car elem)))))
+      (when-let* ((formats (image-converter--filter-formats
+                            (image-converter--probe (car elem)))))
         (setq image-converter (car elem)
               image-converter-regexp (concat "\\." (regexp-opt formats) "\\'")
               image-converter-file-name-extensions formats)

lisp/image/image-dired-util.el

@@ -125,7 +125,7 @@ See also `image-dired-thumbnail-storage' and
 
 (defun image-dired-file-name-at-point ()
   "Get abbreviated file name for thumbnail or display image at point."
-  (when-let ((f (image-dired-original-file-name)))
+  (when-let* ((f (image-dired-original-file-name)))
     (abbreviate-file-name f)))
 
 (defun image-dired-associated-dired-buffer ()

lisp/image/image-dired.el

@@ -663,7 +663,7 @@ only useful if `image-dired-track-movement' is nil."
     (image-dired--with-dired-buffer
       (if (not (dired-goto-file file-name))
           (message "Could not find image in Dired buffer for tracking")
-        (when-let (window (image-dired-get-buffer-window (current-buffer)))
+        (when-let* ((window (image-dired-get-buffer-window (current-buffer))))
           (set-window-point window (point)))))))
 
 (defun image-dired-toggle-movement-tracking ()
@@ -863,7 +863,7 @@ for.  The default is to look for `dired-marker-char'."
   "Run BODY in associated Dired buffer with point on current file's line.
 Should be called from commands in `image-dired-thumbnail-mode'."
   (declare (indent defun) (debug t))
-  `(if-let ((file-name (image-dired-original-file-name)))
+  `(if-let* ((file-name (image-dired-original-file-name)))
        (image-dired--with-dired-buffer
          (when (dired-goto-file file-name)
            ,@body))
@@ -871,9 +871,9 @@ Should be called from commands in `image-dired-thumbnail-mode'."
 
 (defmacro image-dired--with-thumbnail-buffer (&rest body)
   (declare (indent defun) (debug t))
-  `(if-let ((buf (get-buffer image-dired-thumbnail-buffer)))
+  `(if-let* ((buf (get-buffer image-dired-thumbnail-buffer)))
        (with-current-buffer buf
-         (if-let ((win (get-buffer-window buf)))
+         (if-let* ((win (get-buffer-window buf)))
              (with-selected-window win
                ,@body)
            ,@body))
@@ -932,7 +932,7 @@ You probably want to use this together with
 `image-dired-track-original-file'."
   (interactive nil image-dired-thumbnail-mode)
   (image-dired--with-dired-buffer
-    (if-let ((window (image-dired-get-buffer-window (current-buffer))))
+    (if-let* ((window (image-dired-get-buffer-window (current-buffer))))
         (progn
           (if (not (equal (selected-frame) (window-frame window)))
               (select-frame-set-input-focus (window-frame window)))
@@ -1090,7 +1090,7 @@ This is used by `image-dired-slideshow-start'."
 
 (defun image-dired--slideshow-step ()
   "Step to the next image in a slideshow."
-  (if-let ((buf (get-buffer image-dired-thumbnail-buffer)))
+  (if-let* ((buf (get-buffer image-dired-thumbnail-buffer)))
       (with-current-buffer buf
         (image-dired-display-next))
     (image-dired--slideshow-stop)))
@@ -1272,7 +1272,7 @@ which is based on `image-mode'."
         (cur-win (selected-window)))
     (when buf
       (kill-buffer buf))
-    (when-let ((buf (find-file-noselect file nil t)))
+    (when-let* ((buf (find-file-noselect file nil t)))
       (pop-to-buffer buf)
       (rename-buffer image-dired-display-image-buffer)
       (if (string-match (image-file-name-regexp) file)

lisp/image/wallpaper.el

@@ -131,14 +131,14 @@ continue running even after exiting Emacs."
 The returned function kills any process named PROCESS-NAME owned
 by the current effective user id."
   (lambda ()
-    (when-let ((procs
-                (seq-filter (lambda (p) (let-alist p
-                                     (and (= .euid (user-uid))
-                                          (equal .comm process-name))))
-                            (mapcar (lambda (pid)
-                                      (cons (cons 'pid pid)
-                                            (process-attributes pid)))
-                                    (list-system-processes)))))
+    (when-let* ((procs
+                 (seq-filter (lambda (p) (let-alist p
+                                           (and (= .euid (user-uid))
+                                                (equal .comm process-name))))
+                             (mapcar (lambda (pid)
+                                       (cons (cons 'pid pid)
+                                             (process-attributes pid)))
+                                     (list-system-processes)))))
       (dolist (proc procs)
         (let-alist proc
           (when (y-or-n-p (format "Kill \"%s\" process with PID %d?" .comm .pid))
@@ -297,7 +297,7 @@ order in which they appear.")
                 (dolist (setter wallpaper--default-setters)
                   (wallpaper-debug "Testing setter %s" (wallpaper-setter-name setter))
                   (when (and (executable-find (wallpaper-setter-command setter))
-                             (if-let ((pred (wallpaper-setter-predicate setter)))
+                             (if-let* ((pred (wallpaper-setter-predicate setter)))
                                  (funcall pred)
                                t))
                     (wallpaper-debug "Found setter %s" (wallpaper-setter-name setter))
@@ -305,12 +305,12 @@ order in which they appear.")
 
 (defun wallpaper--find-command ()
   "Return the appropriate command to set the wallpaper."
-  (when-let ((setter (wallpaper--find-setter)))
+  (when-let* ((setter (wallpaper--find-setter)))
     (wallpaper-setter-command setter)))
 
 (defun wallpaper--find-command-args ()
   "Return command line arguments matching `wallpaper-command'."
-  (when-let ((setter (wallpaper--find-setter)))
+  (when-let* ((setter (wallpaper--find-setter)))
     (wallpaper-setter-args setter)))
 
 
@@ -449,23 +449,23 @@ This function is meaningful only on X and is used only there."
         (if (and .name (member .source '("XRandr" "XRandR 1.5" "Gdk")))
             .name
           "0"))
-    (if-let ((name
-              (and (getenv "DISPLAY")
-                   (or
-                    (cdr (assq 'name
-                               (progn
-                                 (x-open-connection (getenv "DISPLAY"))
-                                 (car (display-monitor-attributes-list
-                                       (car (last (terminal-list))))))))
-                    (and (executable-find "xrandr")
-                         (with-temp-buffer
-                           (call-process "xrandr" nil t nil)
-                           (goto-char (point-min))
-                           (re-search-forward (rx bol
-                                                  (group (+ (not (in " \n"))))
-                                                  " connected")
-                                              nil t)
-                           (match-string 1)))))))
+    (if-let* ((name
+               (and (getenv "DISPLAY")
+                    (or
+                     (cdr (assq 'name
+                                (progn
+                                  (x-open-connection (getenv "DISPLAY"))
+                                  (car (display-monitor-attributes-list
+                                        (car (last (terminal-list))))))))
+                     (and (executable-find "xrandr")
+                          (with-temp-buffer
+                            (call-process "xrandr" nil t nil)
+                            (goto-char (point-min))
+                            (re-search-forward (rx bol
+                                                   (group (+ (not (in " \n"))))
+                                                   " connected")
+                                               nil t)
+                            (match-string 1)))))))
         ;; Prefer "0" to "default" as that works in XFCE.
         (if (equal name "default") "0" name)
       (read-string (format-prompt "Monitor name" nil)))))