My emacs was built from a tarball I downloaded from http://git.savannah.gnu.org/cgit/emacs.git/snapshot/emacs-26.1.90.tar.gz. I believe this is commit 7851ae8b443c62a41ea4f4440512aa56cc87b9b7. It looks like this does not have the change made in commit 8d7e58ce9f389d77323e0237c22c4e. Here is the backtrace from my current build as requested. I will also try applying the fix from 8d7e58ce9f389d77323e0237c22c4e and test again. I ran "emacs -Q -l tramp", then in the *scratch* buffer: (emacs-version) "GNU Emacs 26.1.90 (build 1, x86_64-apple-darwin18.2.0, NS appkit-1671.10 Version 10.14.1 (Build 18B75))\n of 2018-12-03" (tramp-change-syntax 'simplified) simplified (setq debug-on-error t) t Then when I typed (from "view-lossage"): C-x C-f [find-file] / [self-insert-command] c [self-insert-command] o [self-insert-command] s [self-insert-command] 6 [self-insert-command] : [self-insert-command] s [self-insert-command] r [self-insert-command] c [self-insert-command] / [self-insert-command] s [self-insert-command] s [self-insert-command] [minibuffer-complete] I got the error: Debugger entered--Lisp error: (wrong-type-argument stringp "") signal(wrong-type-argument (stringp "")) completion--some(#f(compiled-function (style) #) (basic partial-completion emacs22)) completion--nth-completion(1 "~//cos6:src/ss" read-file-name-internal file-exists-p 14 (metadata (category . file) (completion--unquote-requote . t))) completion-try-completion("~//cos6:src/ss" read-file-name-internal file-exists-p 14 (metadata (category . file) (completion--unquote-requote . t))) completion--do-completion(12 26) completion--in-region-1(12 26) #f(compiled-function (start end collection predicate) #)(12 26 read-file-name-internal file-exists-p) apply(#f(compiled-function (start end collection predicate) #) (12 26 read-file-name-internal file-exists-p)) #f(compiled-function (funs global args) #)(nil nil (12 26 read-file-name-internal file-exists-p)) completion--in-region(12 26 read-file-name-internal file-exists-p) completion-in-region(12 26 read-file-name-internal file-exists-p) minibuffer-complete() funcall-interactively(minibuffer-complete) call-interactively(minibuffer-complete nil nil) command-execute(minibuffer-complete) read-from-minibuffer("Find file: " "~/" (keymap (keymap (32)) keymap (10 . minibuffer-complete-and-exit) (13 . minibuffer-complete-and-exit) keymap (menu-bar keymap (minibuf "Minibuf" keymap (tab menu-item "Complete" minibuffer-complete :help "Complete as far as possible") (space menu-item "Complete Word" minibuffer-complete-word :help "Complete at most one word") (63 menu-item "List Completions" minibuffer-completion-help :help "Display all possible completions") "Minibuf")) (27 keymap (118 . switch-to-completions)) (prior . switch-to-completions) (63 . minibuffer-completion-help) (32 . minibuffer-complete-word) (9 . minibuffer-complete) keymap (menu-bar keymap (minibuf "Minibuf" keymap (previous menu-item "Previous History Item" previous-history-element :help "Put previous minibuffer history element in the minibuffer") (next menu-item "Next History Item" next-history-element :help "Put next minibuffer history element in the minibuffer") (isearch-backward menu-item "Isearch History Backward" isearch-backward :help "Incrementally search minibuffer history backward") (isearch-forward menu-item "Isearch History Forward" isearch-forward :help "Incrementally search minibuffer history forward") (return menu-item "Enter" exit-minibuffer :key-sequence "\015" :help "Terminate input and exit minibuffer") (quit menu-item "Quit" abort-recursive-edit :help "Abort input and exit minibuffer") "Minibuf")) (10 . exit-minibuffer) (13 . exit-minibuffer) (7 . abort-recursive-edit) (C-tab . file-cache-minibuffer-complete) (9 . self-insert-command) (XF86Back . previous-history-element) (up . previous-line-or-history-element) (prior . previous-history-element) (XF86Forward . next-history-element) (down . next-line-or-history-element) (next . next-history-element) (27 keymap (114 . previous-matching-history-element) (115 . next-matching-history-element) (112 . previous-history-element) (110 . next-history-element))) nil file-name-history "~/" nil) completing-read-default("Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/" file-name-history "~/" nil) completing-read("Find file: " read-file-name-internal file-exists-p confirm-after-completion "~/" file-name-history "~/") read-file-name-default("Find file: " nil "~/" confirm-after-completion nil nil) read-file-name("Find file: " nil "~/" confirm-after-completion) find-file-read-args("Find file: " confirm-after-completion) byte-code("\300\301\302 \"\207" [find-file-read-args "Find file: " confirm-nonexistent-file-or-buffer] 3) call-interactively(find-file nil nil) command-execute(find-file) On Wed, Dec 5, 2018 at 2:38 AM Michael Albinus wrote: > Andreas Schwab writes: > > > On Dez 04 2018, David Hull wrote: > > > >> Filename completion does not work with tramp's "simplified" syntax. > >> > >> (load-library "tramp") > >> (tramp-change syntax 'simplified) > >> > >> Now if I run find-file and type "//cos6:src/ss" and then TAB I get the > >> error: > >> > >> completion--some: Wrong type argument: stringp, "" > > > > This is fixed by commit b8b42c2315. > > Indeed, you've backported this fix to the emacs-26 branch. The bug > report tells us > > --8<---------------cut here---------------start------------->8--- > In GNU Emacs 26.1.90 (build 1, x86_64-apple-darwin18.2.0, NS > appkit-1671.10 Version 10.14.1 (Build 18B75)) > of 2018-12-03 built on mbp-109-op-04 > Repository revision: 8d7e58ce9f389d77323e0237c22c4e13cb68b8e7 > --8<---------------cut here---------------end--------------->8--- > > Hmm, a git commit 8d7e58ce9f389d77323e0237c22c4e13cb68b8e7 does not > exist in emacs-26 or master branches. > > > Andreas. > > Best regards, Michael. > -- David Hull