+* minor incompatible change (part of a bug fix by Christophe Rhodes
+ to DIRECTORY behavior): DIRECTORY no longer implicitly promotes
+ NIL slots of its pathname argument to :WILD, and in particular
+ asking for the contents of a directory, which you used to be able
+ to do without explicit wildcards, e.g. (DIRECTORY "/tmp/"),
+ now needs explicit wildcards, e.g. (DIRECTORY "/tmp/*.*").