730 lines
23 KiB
Racket
730 lines
23 KiB
Racket
#lang scheme/base
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(provide signature-messages^ signatures^ signatures@)
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(require racket/unit)
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(require scheme/promise
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mzlib/struct
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(only-in racket/list first rest)
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(for-syntax scheme/base)
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(for-syntax stepper/private/shared))
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(require deinprogramm/signature/signature)
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(require deinprogramm/quickcheck/quickcheck)
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(define-signature signature-messages^
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(recursive-signature-message
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parameter-count-mismatch-message
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argument-count-mismatch-message))
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(define-signature signatures^
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(make-delayed-signature
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make-call-signature
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make-property-signature
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make-predicate-signature
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make-type-variable-signature
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make-list-signature
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make-vector-signature
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make-mixed-signature
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make-combined-signature
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make-case-signature
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make-procedure-signature
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procedure-signature-info?
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procedure-signature-info-arg-signatures procedure-signature-info-return-signature
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make-lazy-wrap-info lazy-wrap-info-constructor lazy-wrap-info-raw-accessors
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prop:lazy-wrap lazy-wrap? lazy-wrap-ref
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make-lazy-wrap-signature
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check-lazy-wraps!
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make-pair-signature checked-car checked-cdr checked-first checked-rest))
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(define-unit signatures@
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(import signature-messages^)
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(export signatures^)
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(define (make-delayed-signature name promise)
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(make-signature name
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(lambda (self obj)
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((signature-enforcer (force promise)) self obj))
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(delay (signature-syntax (force promise)))
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#:arbitrary-promise
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(delay
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(force (signature-arbitrary-promise (force promise))))
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#:info-promise
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(delay
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(force (signature-info-promise (force promise))))
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#:<=?-proc
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(lambda (this-info other-info)
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((signature-<=?-proc (force promise)) this-info other-info))
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#:=?-proc
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(lambda (this-info other-info)
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((signature-=?-proc (force promise)) this-info other-info))))
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; specialized version of the above, supports comparison
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; the promise must produce the result of (proc . args), but its passed separately
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; to give us the right location on backtrace
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(define (make-call-signature name promise proc-promise args-promise syntax)
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(make-signature name
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(lambda (self obj)
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((signature-enforcer (force promise)) self obj))
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(delay syntax)
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#:arbitrary-promise
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(delay
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(force (signature-arbitrary-promise (force promise))))
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#:info-promise
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(delay
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(make-call-info promise (force proc-promise) (force args-promise)))
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#:=?-proc
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(lambda (this-info other-info)
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(and (call-info? other-info)
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(eqv? (force proc-promise) (call-info-proc other-info))
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(equal? (force args-promise) (call-info-args other-info))))))
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(define-struct call-info (promise proc args) #:transparent)
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; klude to support mixed
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(define (real-signature-info sig)
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(let ((raw-info (force (signature-info-promise sig))))
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(if (call-info? raw-info)
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(real-signature-info (force (call-info-promise raw-info)))
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(force raw-info))))
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(define (make-property-signature name access signature syntax)
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(let ((enforce (signature-enforcer signature)))
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(make-signature name
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(lambda (self obj)
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(enforce self (access obj)) ; #### problematic: enforcement doesn't stick
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obj)
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syntax)))
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(define (make-predicate-signature name predicate-promise syntax)
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(make-signature
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name
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(lambda (self obj) ; dynamic binding because of syntax remapping via `signature-update-syntax'
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(if ((force predicate-promise) obj)
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obj
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(begin
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(signature-violation obj self #f #f)
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obj)))
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(delay syntax)
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#:info-promise
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(delay (make-predicate-info (force predicate-promise)))
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#:=?-proc
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(lambda (this-info other-info)
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(and (predicate-info? other-info)
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(eq? (force predicate-promise)
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(predicate-info-predicate other-info))))))
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(define-struct predicate-info (predicate) #:transparent)
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(define (make-type-variable-signature name syntax)
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(make-signature
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name
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(lambda (self obj) obj)
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(delay syntax)
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#:info-promise
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(delay (make-type-variable-info))
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#:=?-proc
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(lambda (this-info other-info)
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(type-variable-info? other-info))))
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; maps lists to pairs of signature, enforced value
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(define lists-table (make-weak-hasheq))
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(define (make-list-signature name arg-signature syntax)
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(make-signature
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name
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(lambda (self obj)
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;;(write (list 'list obj) (current-error-port)) (newline (current-error-port))
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(let recur ((l obj))
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(define (go-on)
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(let ((enforced (cons (apply-signature arg-signature (car l))
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(recur (cdr l)))))
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(hash-set! lists-table l (cons self enforced))
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(hash-set! lists-table enforced (cons self enforced))
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enforced))
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(cond
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((null? l)
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l)
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((not (pair? l))
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(signature-violation obj self #f #f)
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obj)
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((hash-ref lists-table l #f)
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=> (lambda (seen)
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;;(write (list 'seen seen (eq? self (car seen))) (current-error-port)) (newline (current-error-port))
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(if (eq? self (car seen))
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(cdr seen)
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(go-on))))
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(else
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(go-on)))))
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syntax
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#:arbitrary-promise
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(delay
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(lift->arbitrary arbitrary-list arg-signature))
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#:info-promise
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(delay (make-list-info arg-signature))
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#:=?-proc
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(lambda (this-info other-info)
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(and (list-info? other-info)
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(signature=? arg-signature (list-info-arg-signature other-info))))))
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(define-struct list-info (arg-signature) #:transparent)
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(define (lift->arbitrary proc . signatures)
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(let ((arbitraries (map force (map signature-arbitrary-promise signatures))))
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(if (andmap values arbitraries)
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(apply proc arbitraries)
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#f)))
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(define vectors-table (make-weak-hasheq)) ; #### ought to do ephemerons, too
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(define (make-vector-signature name arg-signature syntax)
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(make-signature
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name
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(lambda (self obj)
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(define (check old-sigs)
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(let ((old-sigs (cons arg-signature old-sigs)))
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(hash-set! vectors-table obj old-sigs)
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(let* ((orig (vector->list obj))
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(els (map (lambda (x)
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(apply-signature arg-signature x))
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orig)))
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(if (andmap eq? orig els)
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obj
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(let ((new (list->vector els)))
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(hash-set! vectors-table obj new old-sigs)
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obj)))))
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(cond
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((not (vector? obj))
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(signature-violation obj self #f #f)
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obj)
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((hash-ref vectors-table obj #f)
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=> (lambda (old-sigs)
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(if (ormap (lambda (old-sig)
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(signature<=? old-sig arg-signature))
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old-sigs)
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obj
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(check old-sigs))))
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(else
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(check '()))))
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syntax
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#:arbitrary-promise
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(delay
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(lift->arbitrary arbitrary-vector arg-signature))
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#:info-promise
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(delay (make-vector-info arg-signature))
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#:=?-proc
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(lambda (this-info other-info)
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(and (vector-info? other-info)
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(signature=? arg-signature (vector-info-arg-signature other-info))))))
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(define-struct vector-info (arg-signature) #:transparent)
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(define (make-mixed-signature name alternative-signatures syntax)
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(letrec ((alternative-signatures-promise
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(delay
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(normalize-mixed-signatures mixed-signature alternative-signatures)))
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(mixed-signature
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(make-signature
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name
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(lambda (self obj)
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(let loop ((alternative-signatures (force alternative-signatures-promise)))
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(cond
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((null? alternative-signatures)
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(signature-violation obj self #f #f)
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obj)
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((eq? (car alternative-signatures) self)
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(raise
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(make-exn:fail:contract
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(string->immutable-string
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(if name
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(format "~a: ~a" recursive-signature-message)
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recursive-signature-message))
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(current-continuation-marks))))
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(else
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(check-signature (car alternative-signatures)
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obj
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values
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(lambda () (loop (cdr alternative-signatures))))))))
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(delay syntax)
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#:info-promise
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(delay (make-mixed-info (force alternative-signatures-promise)))
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#:arbitrary-promise
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(delay
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(let* ((arbitrary-promises (map signature-arbitrary-promise alternative-signatures))
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(raising-promises
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(map (lambda (prm)
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(delay
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(or (force prm)
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(error "Signatur hat keinen Generator")))) ; #### src location
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arbitrary-promises)))
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(arbitrary-mixed
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(map (lambda (sig arbp)
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(cons (signature->predicate sig)
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arbp))
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alternative-signatures raising-promises))))
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#:=?-proc
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(lambda (this-info other-info)
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(and (mixed-info? other-info)
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(andmap signature=?
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(mixed-info-signatures this-info)
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(mixed-info-signatures other-info))))
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#:<=?-proc
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(lambda (this-info other-info)
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(and (mixed-info? other-info)
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(mixed-signature<=? (mixed-info-signatures this-info)
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(mixed-info-signatures other-info)))))))
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mixed-signature))
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(define (mixed-signature<=? sigs1 sigs2)
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(andmap (lambda (sig1)
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(ormap (lambda (sig2)
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(signature<=? sig1 sig2))
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sigs2))
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sigs1))
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; Flatten out mixed signatures, and fold in in the lazy-wrap
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; signatures
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(define (normalize-mixed-signatures mixed-signature sigs)
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(fold-lazy-wrap-signatures mixed-signature (flatten-mixed-signatures sigs)))
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(define (flatten-mixed-signatures sigs)
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(apply append
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(map (lambda (sig)
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(let ((info (force (signature-info-promise sig))))
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(if (mixed-info? info)
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(mixed-info-signatures info)
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(list sig))))
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sigs)))
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(define-struct mixed-info (signatures) #:transparent)
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(define (check-signature sig val success fail)
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((let/ec exit
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(let ((enforced
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(call-with-signature-violation-proc
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(lambda (signature syntax msg blame)
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(exit fail))
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(lambda ()
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(apply-signature sig val)))))
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(lambda () (success enforced))))))
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(define (signature->predicate sig)
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(lambda (val)
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(check-signature sig val (lambda (_) #t) (lambda () #f))))
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(define (make-combined-signature name signatures syntax)
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(make-signature
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name
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(lambda (self obj)
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(let ((old-violation-proc (signature-violation-proc)))
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((let/ec exit
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(call-with-signature-violation-proc
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(lambda (signature syntax msg blame)
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(exit
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(lambda ()
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(old-violation-proc signature syntax msg blame)
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obj)))
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(lambda ()
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(let loop ((signatures signatures)
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(obj obj))
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(if (null? signatures)
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(lambda () obj)
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(loop (cdr signatures)
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(apply-signature (car signatures) obj))))))))))
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(delay syntax)))
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(define (make-case-signature name cases =? syntax)
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(make-signature
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name
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(lambda (self obj)
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(let loop ((cases cases))
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(cond
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((null? cases)
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(signature-violation obj self #f #f)
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obj)
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((=? (car cases) obj)
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obj)
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(else
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(loop (cdr cases))))))
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(delay syntax)
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#:arbitrary-promise
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(delay (apply arbitrary-one-of =? cases))))
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(define signature-key (gensym 'signature-key))
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(define-struct procedure-signature-info (arg-signatures return-signature) #:transparent)
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(define (make-procedure-signature name arg-signatures return-signature syntax)
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(let ((arg-count (length arg-signatures)))
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(make-signature
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name
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(lambda (self thing)
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(let-values (((proc blame-syntax)
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(if (procedure-to-blame? thing)
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(values (procedure-to-blame-proc thing)
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(procedure-to-blame-syntax thing))
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(values thing #f))))
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(cond
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((not (procedure? proc))
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(signature-violation proc self #f #f)
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thing)
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((not (procedure-arity-includes? proc arg-count)) ; #### variable arity
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(signature-violation proc self parameter-count-mismatch-message #f)
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thing)
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(else
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(attach-name
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(object-name proc)
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(procedure-reduce-arity
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(lambda args
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(call-with-immediate-continuation-mark
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signature-key
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(lambda (maybe)
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(if (not (= (length args) arg-count))
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(begin
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(signature-violation proc self argument-count-mismatch-message #f)
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(apply-signature return-signature (apply proc args)))
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(let* ((old-violation-proc (signature-violation-proc))
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(arg-violation? #f)
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(args
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(call-with-signature-violation-proc
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(lambda (obj signature message blame)
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(set! arg-violation? #t)
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(old-violation-proc obj signature message blame))
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(lambda ()
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(map apply-signature arg-signatures args)))))
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(if (eq? maybe return-signature)
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(apply proc args)
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(let ((retval
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(with-continuation-mark
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signature-key return-signature
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(apply proc args))))
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(if arg-violation?
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retval
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(call-with-signature-violation-proc
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(lambda (obj signature message _)
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;; blame the procedure
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(old-violation-proc obj signature message blame-syntax))
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(lambda ()
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(apply-signature return-signature retval)))))))))))
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(procedure-arity proc)))))))
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(delay syntax)
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#:arbitrary-promise
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(delay
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(apply lift->arbitrary arbitrary-procedure return-signature arg-signatures))
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#:info-promise
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(delay
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(make-procedure-signature-info arg-signatures return-signature)))))
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(define (attach-name name thing)
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(if (and (procedure? thing)
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(symbol? name))
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(procedure-rename thing name)
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thing))
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; Lazy signature checking for structs
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;; This is attached prop:lazy-wrap property of struct types subject to
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;; lazy checking.
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(define-struct lazy-wrap-info
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(constructor
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raw-accessors raw-mutators
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;; procedures for referencing or setting an additional field within the struct
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;; that field contains a list of lists of unchecked field signatures
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ref-proc set!-proc))
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; value should be a lazy-wrap-info
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(define-values (prop:lazy-wrap lazy-wrap? lazy-wrap-ref)
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(make-struct-type-property 'lazy-wrap))
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; The field accessed by ref-proc and set!-proc contains one of these:
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(define-struct lazy-wrap-log
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;; list of lazy-log-not-checked
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(not-checked
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;; list of lists of field signatures
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checked)
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#:transparent)
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; This situation makes trouble:
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; (make-mixed-signature (make-lazy-wrap-signature ...) (make-lazy-wrap-signature ...) ...)
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; We need to push the `mixed' signature inside the lazy-wrap
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; signature, which is why the struct-map signature has an implicit
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; `mixed'.
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; To this end, a `lazy-log-not-checked' object tracks a list of
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; `mixed' alternatives. The `mixed-signature' field tracks from which
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; `mixed' contract the mixture has originally come from.
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; (It may be #f, in which case the `field-signatures-list' is a one-element list.)
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(define-struct lazy-log-not-checked
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(mixed-signature field-signatures-list)
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#:transparent)
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(define (make-lazy-wrap-signature name eager-checking? type-descriptor predicate field-signatures syntax)
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(really-make-lazy-wrap-signature name eager-checking?
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type-descriptor predicate #f (list field-signatures) syntax))
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; The lists of signatures in `field-signatures-list' form an implicit mixed signature.
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(define (really-make-lazy-wrap-signature name eager-checking? type-descriptor predicate
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mixed-signature field-signatures-list
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syntax)
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(let ((lazy-wrap-info (lazy-wrap-ref type-descriptor))
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(not-checked (make-lazy-log-not-checked mixed-signature field-signatures-list))
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(lazy-wrap-signature-info
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(make-lazy-wrap-signature-info eager-checking? type-descriptor predicate field-signatures-list)))
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(let ((constructor (lazy-wrap-info-constructor lazy-wrap-info))
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(raw-accessors (lazy-wrap-info-raw-accessors lazy-wrap-info))
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(wrap-ref (lazy-wrap-info-ref-proc lazy-wrap-info))
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(wrap-set! (lazy-wrap-info-set!-proc lazy-wrap-info)))
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(make-signature
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name
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(lambda (self thing)
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(if (not (predicate thing))
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(signature-violation thing self #f #f)
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(begin
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(let ((log (wrap-ref thing)))
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(cond
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((not log)
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(wrap-set! thing
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(make-lazy-wrap-log (list not-checked) '())))
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((not (let ()
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(define (<=? sigs1 sigs2)
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(andmap signature<=? sigs1 sigs2))
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(define (check wrap-field-signatures)
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(ormap (lambda (field-signatures)
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(<=? wrap-field-signatures field-signatures))
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field-signatures-list))
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(or (ormap (lambda (wrap-not-checked)
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(andmap check
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(lazy-log-not-checked-field-signatures-list wrap-not-checked)))
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(lazy-wrap-log-not-checked log))
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(ormap check (lazy-wrap-log-checked log)))))
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(wrap-set! thing
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(make-lazy-wrap-log (cons not-checked (lazy-wrap-log-not-checked log))
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(lazy-wrap-log-checked log))))))
|
|
|
|
(when eager-checking?
|
|
(check-lazy-wraps! type-descriptor thing))))
|
|
|
|
thing)
|
|
(delay syntax)
|
|
#:info-promise
|
|
(delay lazy-wrap-signature-info)
|
|
#:=?-proc
|
|
(lambda (this-info other-info)
|
|
(and (lazy-wrap-signature-info? other-info)
|
|
(lazy-wrap-signature-info-field-signatures-list other-info)
|
|
(eq? type-descriptor (lazy-wrap-signature-info-descriptor other-info))
|
|
(andmap (lambda (this-field-signatures)
|
|
(andmap (lambda (other-field-signatures)
|
|
(andmap signature=? this-field-signatures other-field-signatures))
|
|
(lazy-wrap-signature-info-field-signatures-list other-info)))
|
|
(lazy-wrap-signature-info-field-signatures-list this-info))))
|
|
#:<=?-proc
|
|
(lambda (this-info other-info)
|
|
(and (lazy-wrap-signature-info? other-info)
|
|
(lazy-wrap-signature-info-field-signatures-list other-info)
|
|
(eq? type-descriptor (lazy-wrap-signature-info-descriptor other-info))
|
|
(andmap (lambda (this-field-signatures)
|
|
(ormap (lambda (other-field-signatures)
|
|
(andmap signature<=? this-field-signatures other-field-signatures))
|
|
(lazy-wrap-signature-info-field-signatures-list other-info)))
|
|
(lazy-wrap-signature-info-field-signatures-list this-info))))))))
|
|
|
|
(define-struct lazy-wrap-signature-info (eager-checking? descriptor predicate field-signatures-list) #:transparent)
|
|
|
|
(define (check-lazy-wraps! descriptor thing)
|
|
(let ((lazy-wrap-info (lazy-wrap-ref descriptor)))
|
|
|
|
(let ((constructor (lazy-wrap-info-constructor lazy-wrap-info))
|
|
(raw-accessors (lazy-wrap-info-raw-accessors lazy-wrap-info))
|
|
(raw-mutators (lazy-wrap-info-raw-mutators lazy-wrap-info))
|
|
(wrap-ref (lazy-wrap-info-ref-proc lazy-wrap-info))
|
|
(wrap-set! (lazy-wrap-info-set!-proc lazy-wrap-info)))
|
|
|
|
(let ((log (wrap-ref thing)))
|
|
(when (and log (pair? (lazy-wrap-log-not-checked log)))
|
|
(let loop ((field-vals (map (lambda (raw-accessor)
|
|
(raw-accessor thing))
|
|
raw-accessors))
|
|
(now-checked '())
|
|
(not-checkeds (lazy-wrap-log-not-checked log)))
|
|
(if (null? not-checkeds)
|
|
(begin
|
|
(for-each (lambda (raw-mutator field-val)
|
|
(raw-mutator thing field-val))
|
|
raw-mutators field-vals)
|
|
(wrap-set! thing
|
|
(make-lazy-wrap-log '()
|
|
(append now-checked
|
|
(lazy-wrap-log-checked log)))))
|
|
(let ((not-checked (car not-checkeds)))
|
|
(let ((field-signatures-list (lazy-log-not-checked-field-signatures-list not-checked))
|
|
(mixed-signature (lazy-log-not-checked-mixed-signature not-checked)))
|
|
(if (not mixed-signature) ; one-element list
|
|
(loop (map apply-signature (car field-signatures-list) field-vals)
|
|
(cons (car field-signatures-list) now-checked)
|
|
(cdr not-checkeds))
|
|
(let inner ((field-signatures-list field-signatures-list)) ; implicit mixed
|
|
(if (null? field-signatures-list)
|
|
(signature-violation thing mixed-signature #f #f)
|
|
(let map ((sigs (car field-signatures-list))
|
|
(field-vals field-vals)
|
|
(new-field-vals '()))
|
|
(if (null? sigs)
|
|
(loop (reverse new-field-vals)
|
|
(cons (car field-signatures-list) now-checked)
|
|
(cdr not-checkeds))
|
|
(check-signature (car sigs)
|
|
(car field-vals)
|
|
(lambda (new-val)
|
|
(map (cdr sigs)
|
|
(cdr field-vals)
|
|
(cons new-val new-field-vals)))
|
|
(lambda ()
|
|
(inner (cdr field-signatures-list))))))))))))))))))
|
|
|
|
; pushes down mixed contracts
|
|
(define (fold-lazy-wrap-signatures mixed-signature sigs)
|
|
(let ((lazy-wrap-sigs (make-hasheq))) ; maps a type descriptor to signatures
|
|
|
|
(define (push-down-lazy-wrap-sigs)
|
|
(hash-map lazy-wrap-sigs
|
|
(lambda (type-desc signatures)
|
|
(let* ((sig (car signatures))
|
|
(info (real-signature-info (car signatures))))
|
|
(really-make-lazy-wrap-signature
|
|
(signature-name sig)
|
|
(lazy-wrap-signature-info-eager-checking? info)
|
|
type-desc
|
|
(lazy-wrap-signature-info-predicate info)
|
|
mixed-signature
|
|
(apply append
|
|
(map (lambda (sig)
|
|
(lazy-wrap-signature-info-field-signatures-list (real-signature-info sig)))
|
|
signatures))
|
|
(signature-syntax sig))))))
|
|
|
|
(let loop ((sigs sigs)
|
|
(vanilla-sigs '()))
|
|
(if (null? sigs)
|
|
(append (push-down-lazy-wrap-sigs)
|
|
(reverse vanilla-sigs))
|
|
(let* ((sig (car sigs))
|
|
(info (real-signature-info sig)))
|
|
(if (lazy-wrap-signature-info? info)
|
|
(let ((type-desc (lazy-wrap-signature-info-descriptor info)))
|
|
(hash-update! lazy-wrap-sigs
|
|
type-desc
|
|
(lambda (old)
|
|
(cons sig old))
|
|
(lambda ()
|
|
(list sig)))
|
|
(loop (cdr sigs) vanilla-sigs))
|
|
(loop (cdr sigs) (cons sig vanilla-sigs))))))))
|
|
|
|
(define checked-pair-table (make-weak-hasheq))
|
|
|
|
(define-struct checked-pair
|
|
(car cdr log)
|
|
#:mutable)
|
|
|
|
(define (checked-pair-access checked-access raw-access)
|
|
(lambda (p)
|
|
(cond
|
|
((hash-ref checked-pair-table
|
|
p
|
|
(lambda () #f))
|
|
=> (lambda (eph)
|
|
(checked-access (ephemeron-value eph))))
|
|
(else (raw-access p)))))
|
|
|
|
(define checked-raw-car (checked-pair-access checked-pair-car car))
|
|
(define checked-raw-cdr (checked-pair-access checked-pair-cdr cdr))
|
|
(define checked-raw-first (checked-pair-access checked-pair-car first))
|
|
(define checked-raw-rest (checked-pair-access checked-pair-cdr rest))
|
|
|
|
(define (checked-raw-set! checked-set!)
|
|
(lambda (p new)
|
|
(cond
|
|
((hash-ref checked-pair-table
|
|
p
|
|
(lambda () #f))
|
|
=> (lambda (eph)
|
|
(checked-set! (ephemeron-value eph) new)))
|
|
(else
|
|
(let ((cp (make-checked-pair (car p) (cdr p) #f)))
|
|
(checked-set! cp new)
|
|
(hash-set! checked-pair-table p (make-ephemeron p cp)))))))
|
|
|
|
(define checked-raw-set-car! (checked-raw-set! set-checked-pair-car!))
|
|
(define checked-raw-set-cdr! (checked-raw-set! set-checked-pair-cdr!))
|
|
|
|
(define (checked-pair-get-log p)
|
|
(cond
|
|
((hash-ref checked-pair-table
|
|
p
|
|
(lambda () #f))
|
|
=> (lambda (eph)
|
|
(checked-pair-log (ephemeron-value eph))))
|
|
(else #f)))
|
|
|
|
(define (checked-pair-set-log! p new)
|
|
(cond
|
|
((hash-ref checked-pair-table
|
|
p
|
|
(lambda () #f))
|
|
=> (lambda (eph)
|
|
(set-checked-pair-log! (ephemeron-value eph) new)))
|
|
(else
|
|
(hash-set! checked-pair-table p
|
|
(make-ephemeron p
|
|
(make-checked-pair (car p) (cdr p) new))))))
|
|
|
|
(define checked-pair-lazy-wrap-info
|
|
(make-lazy-wrap-info cons
|
|
(list checked-raw-car checked-raw-cdr)
|
|
(list checked-raw-set-car! checked-raw-set-cdr!)
|
|
checked-pair-get-log
|
|
checked-pair-set-log!))
|
|
|
|
(define checked-pair-descriptor
|
|
(call-with-values
|
|
(lambda ()
|
|
(make-struct-type 'dummy-checked-pair #f 0 0 #f
|
|
(list
|
|
(cons prop:lazy-wrap checked-pair-lazy-wrap-info))))
|
|
(lambda (desc . _)
|
|
desc)))
|
|
|
|
(define (make-pair-signature eager-checking? car-sig cdr-sig)
|
|
(make-lazy-wrap-signature 'pair eager-checking?
|
|
checked-pair-descriptor pair? (list car-sig cdr-sig) #'pair))
|
|
|
|
(define (checked-car p)
|
|
(car p)
|
|
(check-lazy-wraps! checked-pair-descriptor p)
|
|
(checked-raw-car p))
|
|
|
|
(define (checked-cdr p)
|
|
(cdr p)
|
|
(check-lazy-wraps! checked-pair-descriptor p)
|
|
(checked-raw-cdr p))
|
|
|
|
(define (checked-first p)
|
|
(first p)
|
|
(check-lazy-wraps! checked-pair-descriptor p)
|
|
(checked-raw-first p))
|
|
|
|
(define (checked-rest p)
|
|
(rest p)
|
|
(check-lazy-wraps! checked-pair-descriptor p)
|
|
(checked-raw-rest p))
|
|
|
|
)
|