Re: Directory name completion blocks when it shouldn't

[Richard Stallman]

    Tim's report is about `M-x cd' (not `M-x dired'),

Indeed, it is.  Several of us mistook this for being about Dired.

                                                      which already reads
    its argument using read-directory-name.

No it doesn't; that was the point we were talking about.

On the other hand, cd does use read-directory-name.
So this appears to be a bug in the completion routines themselves.