[bug-mailutils] Setting up lus syntax

[wish]

I'm trying to use maidag from the debian wheezy package (2.99) to 
deliver/filter my mail with sieve.  I'd rather keep my
mialfilter syntax independent of my current folder format.  From what I read in 
the documentation I should be able to do 
this by prefixing folder names with + and using a single folder directive under 
mailbox to control what that plus represents.

However when I try to do this the mail I intended to send to the folder gets 
deposited in my maildrop instead of the intended
folder.  Turning up debug on a test run indicates that maidag appears to think 
the URL is malformed but I can't see how/why.

Output of a debug run:
--(end of buffer or a NUL)
--accepting rule at line 96 ("mailbox")
--accepting rule at line 149 ("{")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("mailbox-pattern")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""/var/mail/${user}"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("folder")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""mh://Mail"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("auth")
--accepting rule at line 149 ("{")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("authentication")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""pam"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("authorization")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""system"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--accepting rule at line 148 ("
")
--(end of buffer or a NUL)
--EOF (start condition 0)
--(end of buffer or a NUL)
--accepting rule at line 96 ("filter")
--accepting rule at line 149 ("{")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("language")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("sieve")
--accepting rule at line 149 (";")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("pattern")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""~/.mailfilter.sv"")
--accepting rule at line 149 (";")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--(end of buffer or a NUL)
--EOF (start condition 0)
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: /home/wish/.mailfilter.sv:3: notice: (user wish) FILEINTO on msg uid 0; 
delivering into +testofplus
maidag: debug: mu_mailbox_create_default (+testofplus) failed: URL has parts 
not allowed by its scheme
maidag: error: 
maidag: /home/wish/.mailfilter.sv:3: error: fileinto: cannot save to mailbox: 
URL has parts not allowed by its scheme
address@hidden:~$ show -noshowproc 5756|tail -n +2|/usr/sbin/maidag --debug til 
--debug-level 9 --stderr wish 2>&1 |less
You have new mail in /var/mail/wish
address@hidden:~$ show -noshowproc 5756|tail -n +2|/usr/sbin/maidag --debug til 
--debug-level 9 --stderr wish 2>&1 
--(end of buffer or a NUL)
--accepting rule at line 96 ("mailbox")
--accepting rule at line 149 ("{")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("mailbox-pattern")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""/var/mail/${user}"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("folder")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""mh://Mail"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("auth")
--accepting rule at line 149 ("{")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("authentication")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""pam"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 96 ("authorization")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""system"")
--accepting rule at line 149 (";")
--accepting rule at line 148 ("
")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--accepting rule at line 148 ("
")
--(end of buffer or a NUL)
--EOF (start condition 0)
--(end of buffer or a NUL)
--accepting rule at line 96 ("filter")
--accepting rule at line 149 ("{")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("language")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("sieve")
--accepting rule at line 149 (";")
--accepting rule at line 146 (" ")
--accepting rule at line 96 ("pattern")
--accepting rule at line 146 (" ")
--accepting rule at line 107 (""~/.mailfilter.sv"")
--accepting rule at line 149 (";")
--accepting rule at line 149 ("}")
--accepting rule at line 148 ("
")
--(end of buffer or a NUL)
--EOF (start condition 0)
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: debug: Trying system...
maidag: debug: system yields 0=Success
maidag: /home/wish/.mailfilter.sv:3: notice: (user wish) FILEINTO on msg uid 0; 
delivering into +testofplus
maidag: debug: mu_mailbox_create_default (+testofplus) failed: URL has parts 
not allowed by its scheme
maidag: error: 
maidag: /home/wish/.mailfilter.sv:3: error: fileinto: cannot save to mailbox: 
URL has parts not allowed by its scheme