If he did he never published it. In fact, AFAIK Erik never published any code at all.
He did publish some elisp code, which you can see traces of in GNU Emacs and SLIME.
Res ipsa loquitur.
Nemo judex in causa sua.
Non vere curare quid Nemo habet dicere de illo.
(Miror si haec prima flammae latinae in interrete est.)
"interrete"
Heh.
He was working on a conversion of emacs from elisp to common lisp, but I don’t think he got very far on the project before he fell ill. He never shared many details about it, that I know of.