* (ensure-directories-exist #p"/tmp/foo/bar/baz.lisp")
#P"/tmp/foo/bar/baz.lisp"
T
* (ensure-directories-exist #p"/tmp/foo/bar/baz.lisp")
#P"/tmp/foo/bar/baz.lisp"
NIL
* (ensure-directories-exist #p"/tmp/foo/Pyx/bar/baz.lisp")
#P"/tmp/foo/Pyx/bar/baz.lisp"
T
* (ensure-directories-exist #p"/tmp/foo/Pyx/bar/baz.lisp")
#P"/tmp/foo/Pyx/bar/baz.lisp"
NIL