Lists as stacks

PUSH and POP permit a convenient syntax for the use of lists in implementing simple stacks. They are assignment forms, like SET and INCREMENT. See section [*] for a general discussion of assignment forms.

Special form


\begin{inset}{} Cons a pair whose car is {\it object\/} and whose cdr is the val... ...location\/} (LAMBDA (L) (CONS {\it object\/} L))) \\ \end{tabbing}} \end{inset}

Special form


\begin{inset}{} The car of the value in {\it location\/} (this value should be a... ...(CAR {\it location\/}) (MODIFY {\it location\/} CDR)) \end{tabbing}} \end{inset}