Start of moving out analsis into separate module
Not finished and possibly not worth doing.
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@ -9,6 +9,7 @@
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(#%require "syntax.rkt")
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(#%require "environment.rkt")
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(#%require "common.rkt")
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(#%require "special-forms.rkt")
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(#%provide analyzing-driver-loop
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analyzing-eval-program)
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@ -16,95 +17,24 @@
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;;;SECTION 4.1.7
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(define (analyzing-eval exp env)
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((analyze exp) env))
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((analyze exp analyze) env))
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(define (analyze exp)
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(define (analyze exp analyze-proc)
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(cond ((self-evaluating? exp)
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(analyze-self-evaluating exp))
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((quoted? exp) (analyze-quoted exp))
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((variable? exp) (analyze-variable exp))
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((assignment? exp) (analyze-assignment exp))
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((definition? exp) (analyze-definition exp))
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((if? exp) (analyze-if exp))
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((lambda? exp) (analyze-lambda exp))
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((begin? exp) (analyze-sequence (begin-actions exp)))
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((cond? exp) (analyze (cond->if exp)))
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((let? exp) (analyze (let->combination exp)))
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((application? exp) (analyze-application exp))
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(analyze-self-evaluating exp analyze-proc))
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((quoted? exp) (analyze-quoted exp analyze-proc))
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((variable? exp) (analyze-variable exp analyze-proc))
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((assignment? exp) (analyze-assignment exp analyze-proc))
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((definition? exp) (analyze-definition exp analyze-proc))
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((if? exp) (analyze-if exp analyze-proc))
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((lambda? exp) (analyze-lambda exp analyze-proc))
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((begin? exp) (analyze-sequence (begin-actions exp) analyze-proc))
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((cond? exp) (analyze (cond->if exp)) analyze-proc)
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((let? exp) (analyze (let->combination exp)) analyze-proc)
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((application? exp) (analyze-application exp analyze-proc))
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(else
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(error "Unknown expression type -- ANALYZE" exp))))
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(define (analyze-self-evaluating exp)
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(lambda (env) exp))
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(define (analyze-quoted exp)
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(let ((qval (text-of-quotation exp)))
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(lambda (env) qval)))
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(define (analyze-variable exp)
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(lambda (env) (lookup-variable-value exp env)))
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(define (analyze-assignment exp)
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(let ((var (assignment-variable exp))
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(vproc (analyze (assignment-value exp))))
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(lambda (env)
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(set-variable-value! var (vproc env) env)
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'ok)))
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(define (analyze-definition exp)
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(let ((var (definition-variable exp))
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(vproc (analyze (definition-value exp))))
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(lambda (env)
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(define-variable! var (vproc env) env)
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'ok)))
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(define (analyze-if exp)
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(let ((pproc (analyze (if-predicate exp)))
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(cproc (analyze (if-consequent exp)))
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(aproc (analyze (if-alternative exp))))
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(lambda (env)
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(if (true? (pproc env))
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(cproc env)
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(aproc env)))))
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(define (analyze-lambda exp)
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(let ((vars (lambda-parameters exp))
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(bproc (analyze-sequence (scan-out-defines (lambda-body exp)))))
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(lambda (env) (make-procedure vars bproc env))))
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(define (analyze-sequence exps)
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(define (sequentially proc1 proc2)
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(lambda (env) (proc1 env) (proc2 env)))
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(define (loop first-proc rest-procs)
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(if (null? rest-procs)
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first-proc
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(loop (sequentially first-proc (car rest-procs))
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(cdr rest-procs))))
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(let ((procs (map analyze exps)))
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(if (null? procs)
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(error "Empty sequence -- ANALYZE"))
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(loop (car procs) (cdr procs))))
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(define (analyze-application exp)
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(let ((fproc (analyze (operator exp)))
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(aprocs (map analyze (operands exp))))
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(lambda (env)
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(execute-application (fproc env)
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(map (lambda (aproc) (aproc env))
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aprocs)))))
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(define (execute-application proc args)
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(cond ((primitive-procedure? proc)
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(apply-primitive-procedure proc args))
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((compound-procedure? proc)
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((procedure-body proc)
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(extend-environment (procedure-parameters proc)
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args
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(procedure-environment proc))))
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(else
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(error
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"Unknown procedure type -- EXECUTE-APPLICATION"
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proc))))
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(define input-prompt ";;; MA-Eval input:")
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(define output-prompt ";;; MA-Eval value:")
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@ -10,7 +10,16 @@
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eval-definition
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eval-unbind
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eval-and
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eval-or)
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eval-or
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analyze-self-evaluating
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analyze-quoted
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analyze-variable
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analyze-if
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analyze-sequence
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analyze-assignment
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analyze-definition
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analyze-application
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analyze-lambda)
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;; Evaulation of special forms
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@ -58,4 +67,83 @@
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(eval-or (make-or (rest-disjuncts disjuncts)) env)))))
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;; Analysis of special forms
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(define (analyze-self-evaluating exp analyze-proc)
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(lambda (env) exp))
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(define (analyze-quoted exp analyze-proc)
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(let ((qval (text-of-quotation exp)))
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(lambda (env) qval)))
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(define (analyze-variable exp analyze-proc)
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(lambda (env) (lookup-variable-value exp env)))
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(define (analyze-assignment exp analyze-proc)
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(let ((var (assignment-variable exp))
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(vproc (analyze-proc (assignment-value exp)
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analyze-proc)))
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(lambda (env)
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(set-variable-value! var (vproc env) env)
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'ok)))
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(define (analyze-definition exp analyze-proc)
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(let ((var (definition-variable exp))
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(vproc (analyze-proc (definition-value exp)
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analyze-proc)))
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(lambda (env)
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(define-variable! var (vproc env) env)
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'ok)))
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(define (analyze-if exp analyze-proc)
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(let ((pproc (analyze-proc (if-predicate exp) analyze-proc))
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(cproc (analyze-proc (if-consequent exp) analyze-proc))
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(aproc (analyze-proc (if-alternative exp) analyze-proc)))
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(lambda (env)
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(if (true? (pproc env))
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(cproc env)
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(aproc env)))))
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(define (analyze-lambda exp analyze-proc)
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(let ((vars (lambda-parameters exp))
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(bproc (analyze-sequence
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(scan-out-defines
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(lambda-body exp))
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analyze-proc)))
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(lambda (env) (make-procedure vars bproc env))))
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(define (analyze-sequence exps analyze-proc)
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(define (sequentially proc1 proc2)
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(lambda (env) (proc1 env) (proc2 env)))
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(define (loop first-proc rest-procs)
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(if (null? rest-procs)
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first-proc
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(loop (sequentially first-proc (car rest-procs))
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(cdr rest-procs))))
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(let ((procs (map (lambda (e) (analyze-proc e analyze-proc))
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exps)))
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(if (null? procs)
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(error "Empty sequence -- ANALYZE"))
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(loop (car procs) (cdr procs))))
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(define (analyze-application exp analyze-proc)
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(let ((fproc (analyze-proc (operator exp) analyze-proc))
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(aprocs (map (lambda (e) (analyze-proc e analyze-proc))
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(operands exp))))
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(lambda (env)
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(execute-application (fproc env)
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(map (lambda (aproc) (aproc env))
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aprocs)))))
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(define (execute-application proc args)
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(cond ((primitive-procedure? proc)
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(apply-primitive-procedure proc args))
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((compound-procedure? proc)
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((procedure-body proc)
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(extend-environment (procedure-parameters proc)
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args
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(procedure-environment proc))))
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(else
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(error
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"Unknown procedure type -- EXECUTE-APPLICATION"
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proc))))
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