Ran into CCL (but not SBCL) choking on filenames that contain colons (it interprets them as logical hosts, regardless of the fact they're not recognized ones -- and in contravention of the CLHS?).  

Seems like the divergence in behavior between CCL and SBCL is in merge-pathnames - below the level of osicat.

My perhaps naive and overly simplistic expectation of behavior is that of SBCL (not choking, arguably closer adherence to CLHS).

[jm@jm7 ~]$ lx86cl64
Welcome to Clozure Common Lisp Version 1.9-r15870 (LinuxX8664)!
? (merge-pathnames "foo:bar" #P"" :newest)
> Error: "foo" is not a defined logical host
> While executing: CCL::PATHNAME-HOST-SSTR, in process listener(1).
> Type :POP to abort, :R for a list of available restarts.
> Type :? for other options.
1 > (apropos "host-translations")
CCL::%LOGICAL-HOST-TRANSLATIONS%, Value: (("ccl" (#P"ccl:l1;**;*.*" #P"ccl:level-1;**;*.*") (#P"ccl:l1f;**;*.*" #P"ccl:l1-fasls;**;*.*") (#P"ccl:ccl;*.*" #P"/opt/ccl/*.*") (#P"ccl:**;*.*" #P"/opt/ccl/**/*.*")) ("home" (#P"home:**;*.*" #P"/home/jm/**/*.*")))

Found this when rehabbing the ancient CLIM "indented-lists" tree widget, replacing the buggy (in CCL again) pathname hackery therein with osicat (which cleaned up the code).  Turns out dbus/dcop create these files/symlinks in one's home directory, so it's not like I went looking for corner cases...  If possible, I would of course prefer to be able to rely on osicat or the like to insulate me from system or implementation-dependent behavior.  Does anybody have any guidance?

Thanks in advance.

-jm