Empty password in gmail - {XDH}

Uday says: (viewmail-info, 2011-08-08)

I was able to reproduce something similar by giving an empty password to
gmail. The session shows:
Starting IMAP over SSL session Mon Aug 08 10:37:33 2011
-- connecting to imap.gmail.com:993
* OK Gimap ready for requests from 92.232.137.113 b21if4769841wef.158
-- connected for folders
VM CAPABILITY
* CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 XYZZY SASL-IR AUTH=XOAUTH
VM OK Thats all she wrote! b21if4769841wef.158
VM LOGIN <parameters omitted>
* BYE [UNAVAILABLE] Temporary System Error
VM NO System Error {XDH} (Failure)
Process IMAP over SSL finished
Two problems here.
- First of all, gmail seems to have had an internal crash. How silly is
that? For an empty password?
- Secondly, it dumped some string "{XDH}", which, in IMAP protocol, is
supposed to mean, I am sending you a stream of data and here is its length.
After that there should be an end of line. VM's parser rightly flags up a
syntax error.