bug#11808: IDO fails with tramp /ftp:

Hi, 

When I try to access ftp through ido I am getting on 24.1.50.1 

Debugger entered--Lisp error: (file-error "Opening directory" "no such file or directory" "/ftp:anonymous <at> cran.r-project.org:./")
  signal(file-error ("Opening directory" "no such file or directory" "/ftp:anonymous <at> cran.r-project.org:./"))
  byte-code("\301 <at> A\"\207" [err signal] 3)
  ange-ftp-hook-function(file-name-all-completions "" "/ftp:anonymous <at> cran.r-project.org:./")
  apply(ange-ftp-hook-function file-name-all-completions ("" "/ftp:anonymous <at> cran.r-project.org:./"))
  tramp-ftp-file-name-handler(file-name-all-completions "" "/ftp:anonymous <at> cran.r-project.org:./")
  apply(tramp-ftp-file-name-handler file-name-all-completions ("" "/ftp:anonymous <at> cran.r-project.org:./"))
  byte-code("\300\301\215\207" [suppress (apply foreign operation args)] 2)
  #[nil
"K\306\211<\203\240\n <at> \307=\203\240\306\310\311!\203\"\312\311\313N <at> !\202\221\314\315!\2039\316\315!\2044\317\315!\205\221\315
\202\221\320\321!\211\205D\322\f!)\203P\323\320\321!!\202\221\320\324!\211\205[\322\f!)\203g\323\320\324!!\202\221\320\325!\211\205r\322\f!)\203~\323\320\325!!\202\221\326\327!\203\212\323\327!\202\221\330\331!\210\323\332!)\333\n\211*A <at> )\334\335#\210)\336\337\215\211\336=\203\315+\340\341\342,C-\"C-./0\306\343\344\217,\210\345,-\"\202
	\346=\203\377\3061+\347\350\342,C-\"C-./0\306\343\344\217,\210\351+!\210\345,-\")\202
	*\207"
[foreign result sf file-name-handler-alist d default-directory nil autoload boundp
temporary-file-directory eval standard-value fboundp temp-directory subrp functionp getenv "TEMP"
file-directory-p file-name-as-directory "TMP" "TMPDIR" file-exists-p "c:/temp" message "Neither
`temporary-file-directory' nor `temp-directory' is defined -- using /tmp." "/tmp" load noerror
nomessage non-essential (byte-code "\300\301\215\207" [suppress (apply foreign operation args)] 2)
5 "Non-essential received in operation %s" append (byte-code "	X\205}\306
\307\216\203;\310X\203;\311\312\313U\203!\314\2026\315U\203+\314\2026\316U\2035\317\2026\320\fP#\210	\321Y\205|\203d\322!\203d\323\324!!\203dr\324!q\210\325!)\205|\326!\205|\311\327\330\331\"\fP$*\207"
[level tramp-verbose save-match-data-internal tramp-message-show-message fmt-string args
match-data ((byte-code "\301\302\"\207" [save-match-data-internal set-match-data evaporate]
3)) 3 apply message 0 "" 1 2 "Warning: " "Tramp: " 4 processp buffer-name process-buffer
tramp-dissect-file-name vectorp tramp-debug-message format "(%d) # " vec-or-proc
default-directory] 6) ((error)) tramp-run-real-handler suppress 1 "Suppress received in operation
%s" tramp-cleanup x v operation args fmt-string level vec-or-proc tramp-message-show-message] 7]()
  tramp-file-name-handler(file-name-all-completions "" "/ftp:anonymous <at> cran.r-project.org:./")