bug#18891: Doesn't handle pwd = /C: very well

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Wed, 05 Nov 2014 14:45:36 -0500
> Cc: 18891@debbugs.gnu.org
> 
> 
> PS this makes me think, what happens if the local file name happens to
> match a remote host that does exist...

I think the file should match a remote host prefixed with a protocol
supported by Tramp, not just the host name, for this issue to pop up.

> If as you say the design prefers remote hosts over local ones, that
> seems like a bad design to me.

I think the idea is that such files are very rare, and using the /:
prefix to quote them is the fire escape.