defvar, defparameter, :unbound

[mips!escargot.earl@glacier (Earl Killian)]

This doesn't seem important enough to become a language feature; one
of advantages of lisp is that you could have written a DOCVAR macro
that does what you want for this one particular application, and then
just done
	(docvar foo "Foo is unbound")
instead of
	(defvar foo :unbound "Foo is unbound")