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The INTERLISP Interpreter
The flow chart presented below describes the operation of the INTERLISP
interpreter, and corresponds to the m-expression definition of the LISP 1.5
interpreter to be found in the LISP 1.5 manual, [McC1]. Note that car of a
form must be a function; it cannot evaluate to a function.
If car of a form is atomic, its function cell must contain
(a) an S-expression of the form (LAMBDA ...) or (NLAMBDA ...); or
(b) a pointer to compiled code; or
(c) a SUBR definition (see Section 8);
Otherwise the form is considered faulty.
If car of a form is an S-expression beginning with LAMBDA or NLAMBDA, the
S-expression is the function. If car of the form begins with FUNARG, the
funarg mechanism is invoked (see Section 11). Otherwise the form is faulty.
Note: variables c and d are for description only; they are not actually bound