This directory contains PDP-10 Maclisp code by JONL and RWK for various stuff,
including DEFMACRO, BACKQUOTE and SHARPSIGN read syntax, LET, SETF,
and a record-structure interface called DEFVST, plus a STRING package.
Some of this stuff goes by the name of "Maclisp Extensions" in the 
Multics Implementation.

N.B. This stuff never had anything to do with any code which ran in VAX-NIL.