Aucbvax.4892
fa.editor-p
utzoo!decvax!ucbvax!editor-people
Sun Nov  1 22:36:07 1981
Integrating Editors with Programming Languages
>From EAK@MIT-MC Sun Nov  1 22:26:47 1981
To: ihnss!cbosg!cbosgd!mark at Berkeley

Other people have already replied to your message about data
structures in lisp, but no one has made it clear that in the
mit-origin dialects doing what you want is probably as simple as
saying

(defstruct (node)
    left-child
    parent
    right-child)

and later
    (parent n) or (right-child n) or
    (setf (left-child n) x)