;;;; stuff originally from CMU CL's error.lisp which can or should
;;;; come late (mostly related to the CONDITION class itself)
;;;;
-;;;; FIXME: should perhaps be called condition.lisp, or moved into
-;;;; classes.lisp
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
(/show0 "condition.lisp 24")
-(def!struct (condition-class (:include slot-class)
- (:constructor bare-make-condition-class))
+(def!struct (condition-classoid (:include slot-classoid)
+ (:constructor make-condition-classoid))
;; list of CONDITION-SLOT structures for the direct slots of this
;; class
(slots nil :type list)
(/show0 "condition.lisp 49")
-(defun make-condition-class (&rest rest)
- (apply #'bare-make-condition-class
- (rename-key-args '((:name :%name)) rest)))
-
-(/show0 "condition.lisp 53")
-
) ; EVAL-WHEN
(!defstruct-with-alternate-metaclass condition
:slot-names (actual-initargs assigned-slots)
:boa-constructor %make-condition-object
:superclass-name instance
- :metaclass-name condition-class
- :metaclass-constructor make-condition-class
+ :metaclass-name condition-classoid
+ :metaclass-constructor make-condition-classoid
:dd-type structure)
(defun make-condition-object (actual-initargs)
;; allocation of this slot, or NIL until defaulted
(allocation nil :type (member :instance :class nil))
;; If ALLOCATION is :CLASS, this is a cons whose car holds the value.
- (cell nil :type (or cons null)))
+ (cell nil :type (or cons null))
+ ;; slot documentation
+ (documentation nil :type (or string null)))
;;; KLUDGE: It's not clear to me why CONDITION-CLASS has itself listed
;;; in its CPL, while other classes derived from CONDITION-CLASS don't
(eval-when (:compile-toplevel :load-toplevel :execute)
(/show0 "condition.lisp 103")
(let ((condition-class (locally
- ;; KLUDGE: There's a DEFTRANSFORM FIND-CLASS for
- ;; constant class names which creates fast but
- ;; non-cold-loadable, non-compact code. In this
- ;; context, we'd rather have compact, cold-loadable
- ;; code. -- WHN 19990928
- (declare (notinline sb!xc:find-class))
- (sb!xc:find-class 'condition))))
- (setf (condition-class-cpl condition-class)
+ ;; KLUDGE: There's a DEFTRANSFORM
+ ;; FIND-CLASSOID for constant class names
+ ;; which creates fast but
+ ;; non-cold-loadable, non-compact code. In
+ ;; this context, we'd rather have compact,
+ ;; cold-loadable code. -- WHN 19990928
+ (declare (notinline find-classoid))
+ (find-classoid 'condition))))
+ (setf (condition-classoid-cpl condition-class)
(list condition-class)))
(/show0 "condition.lisp 103"))
-(setf (condition-class-report (locally
- ;; KLUDGE: There's a DEFTRANSFORM FIND-CLASS
- ;; for constant class names which creates fast
- ;; but non-cold-loadable, non-compact code. In
- ;; this context, we'd rather have compact,
- ;; cold-loadable code. -- WHN 19990928
- (declare (notinline sb!xc:find-class))
- (find-class 'condition)))
+(setf (condition-classoid-report (locally
+ ;; KLUDGE: There's a DEFTRANSFORM
+ ;; FIND-CLASSOID for constant class
+ ;; names which creates fast but
+ ;; non-cold-loadable, non-compact
+ ;; code. In this context, we'd
+ ;; rather have compact,
+ ;; cold-loadable code. -- WHN
+ ;; 19990928
+ (declare (notinline find-classoid))
+ (find-classoid 'condition)))
(lambda (cond stream)
(format stream "Condition ~S was signalled." (type-of cond))))
(reverse
(reduce #'append
(mapcar (lambda (x)
- (condition-class-cpl
- (sb!xc:find-class x)))
+ (condition-classoid-cpl
+ (find-classoid x)))
parent-types)))))
(cond-layout (info :type :compiler-layout 'condition))
(olayout (info :type :compiler-layout name))
(new-inherits
(order-layout-inherits (concatenate 'simple-vector
(layout-inherits cond-layout)
- (mapcar #'class-layout cpl)))))
+ (mapcar #'classoid-layout cpl)))))
(if (and olayout
(not (mismatch (layout-inherits olayout) new-inherits)))
olayout
- (make-layout :class (make-undefined-class name)
+ (make-layout :classoid (make-undefined-classoid name)
:inherits new-inherits
:depthoid -1
:length (layout-length cond-layout)))))
;; KLUDGE: A comment from CMU CL here said
;; 7/13/98 BUG? CPL is not sorted and results here depend on order of
;; superclasses in define-condition call!
- (dolist (class (condition-class-cpl (sb!xc:class-of x))
+ (dolist (class (condition-classoid-cpl (classoid-of x))
(error "no REPORT? shouldn't happen!"))
- (let ((report (condition-class-report class)))
+ (let ((report (condition-classoid-report class)))
(when report
(return (funcall report x stream)))))))
\f
(defun find-slot-default (class slot)
(let ((initargs (condition-slot-initargs slot))
- (cpl (condition-class-cpl class)))
+ (cpl (condition-classoid-cpl class)))
(dolist (class cpl)
- (let ((default-initargs (condition-class-default-initargs class)))
+ (let ((default-initargs (condition-classoid-default-initargs class)))
(dolist (initarg initargs)
(let ((val (getf default-initargs initarg *empty-condition-slot*)))
(unless (eq val *empty-condition-slot*)
(defun find-condition-class-slot (condition-class slot-name)
(dolist (sclass
- (condition-class-cpl condition-class)
+ (condition-classoid-cpl condition-class)
(error "There is no slot named ~S in ~S."
slot-name condition-class))
- (dolist (slot (condition-class-slots sclass))
+ (dolist (slot (condition-classoid-slots sclass))
(when (eq (condition-slot-name slot) slot-name)
(return-from find-condition-class-slot slot)))))
(defun condition-writer-function (condition new-value name)
- (dolist (cslot (condition-class-class-slots
- (layout-class (%instance-layout condition)))
+ (dolist (cslot (condition-classoid-class-slots
+ (layout-classoid (%instance-layout condition)))
(setf (getf (condition-assigned-slots condition) name)
new-value))
(when (eq (condition-slot-name cslot) name)
(return (setf (car (condition-slot-cell cslot)) new-value)))))
(defun condition-reader-function (condition name)
- (let ((class (layout-class (%instance-layout condition))))
- (dolist (cslot (condition-class-class-slots class))
+ (let ((class (layout-classoid (%instance-layout condition))))
+ (dolist (cslot (condition-classoid-class-slots class))
(when (eq (condition-slot-name cslot) name)
(return-from condition-reader-function
(car (condition-slot-cell cslot)))))
-
(let ((val (getf (condition-assigned-slots condition) name
*empty-condition-slot*)))
(if (eq val *empty-condition-slot*)
(slot (find-condition-class-slot class name)))
(unless slot
(error "missing slot ~S of ~S" name condition))
- (dolist (initarg (condition-slot-initargs slot))
- (let ((val (getf actual-initargs
- initarg
- *empty-condition-slot*)))
- (unless (eq val *empty-condition-slot*)
- (return-from condition-reader-function
- (setf (getf (condition-assigned-slots condition)
- name)
- val)))))
- (setf (getf (condition-assigned-slots condition) name)
- (find-slot-default class slot)))
+ (do ((initargs actual-initargs (cddr initargs)))
+ ((endp initargs)
+ (setf (getf (condition-assigned-slots condition) name)
+ (find-slot-default class slot)))
+ (when (member (car initargs) (condition-slot-initargs slot))
+ (return-from condition-reader-function
+ (setf (getf (condition-assigned-slots condition)
+ name)
+ (cadr initargs))))))
val))))
\f
;;;; MAKE-CONDITION
;; Note: ANSI specifies no exceptional situations in this function.
;; signalling simple-type-error would not be wrong.
(let* ((thing (if (symbolp thing)
- (sb!xc:find-class thing)
+ (find-classoid thing)
thing))
(class (typecase thing
- (condition-class thing)
- (class
+ (condition-classoid thing)
+ (classoid
(error 'simple-type-error
:datum thing
:expected-type 'condition-class
:format-control "bad thing for class argument:~% ~S"
:format-arguments (list thing)))))
(res (make-condition-object args)))
- (setf (%instance-layout res) (class-layout class))
+ (setf (%instance-layout res) (classoid-layout class))
;; Set any class slots with initargs present in this call.
- (dolist (cslot (condition-class-class-slots class))
+ (dolist (cslot (condition-classoid-class-slots class))
(dolist (initarg (condition-slot-initargs cslot))
(let ((val (getf args initarg *empty-condition-slot*)))
(unless (eq val *empty-condition-slot*)
(setf (car (condition-slot-cell cslot)) val)))))
;; Default any slots with non-constant defaults now.
- (dolist (hslot (condition-class-hairy-slots class))
+ (dolist (hslot (condition-classoid-hairy-slots class))
(when (dolist (initarg (condition-slot-initargs hslot) t)
(unless (eq (getf args initarg *empty-condition-slot*)
*empty-condition-slot*)
(eval-when (:compile-toplevel :load-toplevel :execute)
(defun %compiler-define-condition (name direct-supers layout)
(multiple-value-bind (class old-layout)
- (insured-find-class name #'condition-class-p #'make-condition-class)
- (setf (layout-class layout) class)
- (setf (class-direct-superclasses class)
- (mapcar #'sb!xc:find-class direct-supers))
+ (insured-find-classoid name
+ #'condition-classoid-p
+ #'make-condition-classoid)
+ (setf (layout-classoid layout) class)
+ (setf (classoid-direct-superclasses class)
+ (mapcar #'find-classoid direct-supers))
(cond ((not old-layout)
(register-layout layout))
((not *type-system-initialized*)
- (setf (layout-class old-layout) class)
+ (setf (layout-classoid old-layout) class)
(setq layout old-layout)
- (unless (eq (class-layout class) layout)
+ (unless (eq (classoid-layout class) layout)
(register-layout layout)))
((redefine-layout-warning "current"
old-layout
(layout-inherits layout)
(layout-depthoid layout))
(register-layout layout :invalidate t))
- ((not (class-layout class))
+ ((not (classoid-layout class))
(register-layout layout)))
(setf (layout-info layout)
;; names which creates fast but non-cold-loadable, non-compact
;; code. In this context, we'd rather have compact, cold-loadable
;; code. -- WHN 19990928
- (declare (notinline sb!xc:find-class))
- (layout-info (class-layout (sb!xc:find-class 'condition)))))
+ (declare (notinline find-classoid))
+ (layout-info (classoid-layout (find-classoid 'condition)))))
- (setf (sb!xc:find-class name) class)
+ (setf (find-classoid name) class)
;; Initialize CPL slot.
- (setf (condition-class-cpl class)
- (remove-if-not #'condition-class-p
+ (setf (condition-classoid-cpl class)
+ (remove-if-not #'condition-classoid-p
(std-compute-class-precedence-list class))))
(values))
;;; and documenting it here would be good. (Or, if this is not in fact
;;; ANSI-compliant, fixing it would also be good.:-)
(defun compute-effective-slots (class)
- (collect ((res (copy-list (condition-class-slots class))))
- (dolist (sclass (condition-class-cpl class))
- (dolist (sslot (condition-class-slots sclass))
- (let ((found (find (condition-slot-name sslot) (res))))
+ (collect ((res (copy-list (condition-classoid-slots class))))
+ (dolist (sclass (cdr (condition-classoid-cpl class)))
+ (dolist (sslot (condition-classoid-slots sclass))
+ (let ((found (find (condition-slot-name sslot) (res)
+ :key #'condition-slot-name)))
(cond (found
(setf (condition-slot-initargs found)
(union (condition-slot-initargs found)
(res (copy-structure sslot)))))))
(res)))
+;;; Early definitions of slot accessor creators.
+;;;
+;;; Slot accessors must be generic functions, but ANSI does not seem
+;;; to specify any of them, and we cannot support it before end of
+;;; warm init. So we use ordinary functions inside SBCL, and switch to
+;;; GFs only at the end of building.
+(declaim (notinline install-condition-slot-reader
+ install-condition-slot-writer))
+(defun install-condition-slot-reader (name condition slot-name)
+ (declare (ignore condition))
+ (setf (fdefinition name)
+ (lambda (condition)
+ (condition-reader-function condition slot-name))))
+(defun install-condition-slot-writer (name condition slot-name)
+ (declare (ignore condition))
+ (setf (fdefinition name)
+ (lambda (new-value condition)
+ (condition-writer-function condition new-value slot-name))))
+
(defun %define-condition (name slots documentation report default-initargs)
- (let ((class (sb!xc:find-class name)))
- (setf (condition-class-slots class) slots)
- (setf (condition-class-report class) report)
- (setf (condition-class-default-initargs class) default-initargs)
+ (let ((class (find-classoid name)))
+ (setf (condition-classoid-slots class) slots)
+ (setf (condition-classoid-report class) report)
+ (setf (condition-classoid-default-initargs class) default-initargs)
(setf (fdocumentation name 'type) documentation)
(dolist (slot slots)
;; Set up reader and writer functions.
- (let ((name (condition-slot-name slot)))
+ (let ((slot-name (condition-slot-name slot)))
(dolist (reader (condition-slot-readers slot))
- (setf (fdefinition reader)
- (lambda (condition)
- (condition-reader-function condition name))))
+ (install-condition-slot-reader reader name slot-name))
(dolist (writer (condition-slot-writers slot))
- (setf (fdefinition writer)
- (lambda (new-value condition)
- (condition-writer-function condition new-value name))))))
+ (install-condition-slot-writer writer name slot-name))))
;; Compute effective slots and set up the class and hairy slots
;; (subsets of the effective slots.)
(let ((eslots (compute-effective-slots class))
(e-def-initargs
(reduce #'append
- (mapcar #'condition-class-default-initargs
- (condition-class-cpl class)))))
+ (mapcar #'condition-classoid-default-initargs
+ (condition-classoid-cpl class)))))
(dolist (slot eslots)
(ecase (condition-slot-allocation slot)
(:class
(funcall initform)
initform))
*empty-condition-slot*))))
- (push slot (condition-class-class-slots class)))
+ (push slot (condition-classoid-class-slots class)))
((:instance nil)
(setf (condition-slot-allocation slot) :instance)
(when (or (functionp (condition-slot-initform slot))
(dolist (initarg (condition-slot-initargs slot) nil)
(when (functionp (getf e-def-initargs initarg))
(return t))))
- (push slot (condition-class-hairy-slots class))))))))
+ (push slot (condition-classoid-hairy-slots class))))))))
name)
(defmacro define-condition (name (&rest parent-types) (&rest slot-specs)
(slot-name (first spec))
(allocation :instance)
(initform-p nil)
+ documentation
initform)
(collect ((initargs)
(readers)
(:initarg (initargs arg))
(:allocation
(setq allocation arg))
+ (:documentation
+ (when documentation
+ (error "more than one :DOCUMENTATION in ~S" spec))
+ (unless (stringp arg)
+ (error "slot :DOCUMENTATION argument is not a string: ~S"
+ arg))
+ (setq documentation arg))
(:type)
(t
(error "unknown slot option:~% ~S" (first options))))))
:readers ',(readers)
:writers ',(writers)
:initform-p ',initform-p
+ :documentation ',documentation
:initform
,(if (constantp initform)
`',(eval initform)
(t
(error "unknown option: ~S" (first option)))))
- (when (all-writers)
- (warn "Condition slot setters probably not allowed in ANSI CL:~% ~S"
- (all-writers)))
-
`(progn
(eval-when (:compile-toplevel :load-toplevel :execute)
(%compiler-define-condition ',name ',parent-types ',layout))
;;; methods)
(defun describe-condition (condition stream)
(format stream
- "~@<~S ~_is a ~S. ~_Its slot values are ~_~S.~:>"
+ "~&~@<~S ~_is a ~S. ~_Its slot values are ~_~S.~:>~%"
condition
(type-of condition)
(concatenate 'list
((pathname :reader file-error-pathname :initarg :pathname))
(:report
(lambda (condition stream)
- (format stream
- "~@<error on file ~_~S: ~2I~:_~?~:>"
- (file-error-pathname condition)
- ;; FIXME: ANSI's FILE-ERROR doesn't have FORMAT-CONTROL and
- ;; FORMAT-ARGUMENTS, and the inheritance here doesn't seem
- ;; to give us FORMAT-CONTROL or FORMAT-ARGUMENTS either.
- ;; So how does this work?
- (serious-condition-format-control condition)
- (serious-condition-format-arguments condition)))))
+ (format stream "error on file ~S" (file-error-pathname condition)))))
(define-condition package-error (error)
((package :reader package-error-package :initarg :package)))
"The function ~S is undefined."
(cell-error-name condition)))))
+(define-condition special-form-function (undefined-function) ()
+ (:report
+ (lambda (condition stream)
+ (format stream
+ "Cannot FUNCALL the SYMBOL-FUNCTION of special operator ~S."
+ (cell-error-name condition)))))
+
(define-condition arithmetic-error (error)
((operation :reader arithmetic-error-operation
:initarg :operation
;;;; setup of CONDITION machinery, only because that makes it easier to
;;;; get cold init to work.
+(define-condition values-type-error (type-error)
+ ()
+ (:report
+ (lambda (condition stream)
+ (format stream
+ "~@<The values set ~2I~:_[~{~S~^ ~}] ~I~_is not of type ~2I~_~S.~:>"
+ (type-error-datum condition)
+ (type-error-expected-type condition)))))
+
;;; KLUDGE: a condition for floating point errors when we can't or
;;; won't figure out what type they are. (In FreeBSD and OpenBSD we
;;; don't know how, at least as of sbcl-0.6.7; in Linux we probably
"The index ~S is too large."
(type-error-datum condition)))))
+(define-condition bounding-indices-bad-error (type-error)
+ ((object :reader bounding-indices-bad-object :initarg :object))
+ (:report
+ (lambda (condition stream)
+ (let* ((datum (type-error-datum condition))
+ (start (car datum))
+ (end (cdr datum))
+ (object (bounding-indices-bad-object condition)))
+ (etypecase object
+ (sequence
+ (format stream
+ "The bounding indices ~S and ~S are bad for a sequence of length ~S."
+ start end (length object)))
+ (array
+ ;; from WITH-ARRAY-DATA
+ (format stream
+ "The START and END parameters ~S and ~S are bad for an array of total size ~S."
+ start end (array-total-size object))))))))
+
+(define-condition nil-array-accessed-error (type-error)
+ ()
+ (:report (lambda (condition stream)
+ (format stream
+ "An attempt to access an array of element-type ~
+ NIL was made. Congratulations!"))))
+
(define-condition io-timeout (stream-error)
((direction :reader io-timeout-direction :initarg :direction))
(:report
"unexpected end of file on ~S ~A"
(stream-error-stream condition)
(reader-eof-error-context condition)))))
+
+(define-condition reader-impossible-number-error (reader-error)
+ ((error :reader reader-impossible-number-error-error :initarg :error))
+ (:report
+ (lambda (condition stream)
+ (let ((error-stream (stream-error-stream condition)))
+ (format stream "READER-ERROR ~@[at ~W ~]on ~S:~%~?~%Original error: ~A"
+ (file-position error-stream) error-stream
+ (reader-error-format-control condition)
+ (reader-error-format-arguments condition)
+ (reader-impossible-number-error-error condition))))))
+
+(define-condition sb!ext::timeout (serious-condition) ())
+
+(define-condition defconstant-uneql (error)
+ ((name :initarg :name :reader defconstant-uneql-name)
+ (old-value :initarg :old-value :reader defconstant-uneql-old-value)
+ (new-value :initarg :new-value :reader defconstant-uneql-new-value))
+ (:report
+ (lambda (condition stream)
+ (format stream
+ "~@<The constant ~S is being redefined (from ~S to ~S)~@:>"
+ (defconstant-uneql-name condition)
+ (defconstant-uneql-old-value condition)
+ (defconstant-uneql-new-value condition)))))
\f
;;;; special SBCL extension conditions
-;;; a condition for use in stubs for operations which aren't
-;;; unsupported on some OSes/CPUs/whatever
+;;; an error apparently caused by a bug in SBCL itself
+;;;
+;;; Note that we don't make any serious effort to use this condition
+;;; for *all* errors in SBCL itself. E.g. type errors and array
+;;; indexing errors can occur in functions called from SBCL code, and
+;;; will just end up as ordinary TYPE-ERROR or invalid index error,
+;;; because the signalling code has no good way to know that the
+;;; underlying problem is a bug in SBCL. But in the fairly common case
+;;; that the signalling code does know that it's found a bug in SBCL,
+;;; this condition is appropriate, reusing boilerplate and helping
+;;; users to recognize it as an SBCL bug.
+(define-condition bug (simple-error)
+ ()
+ (:report
+ (lambda (condition stream)
+ (format stream
+ "~@< ~? ~:@_~?~:>"
+ (simple-condition-format-control condition)
+ (simple-condition-format-arguments condition)
+ "~@<This is probably a bug in SBCL itself. (Alternatively, ~
+ SBCL might have been corrupted by bad user code, e.g. by an ~
+ undefined Lisp operation like ~S, or by stray pointers from ~
+ alien code or from unsafe Lisp code; or there might be a bug ~
+ in the OS or hardware that SBCL is running on.) If it seems to ~
+ be a bug in SBCL itself, the maintainers would like to know ~
+ about it. Bug reports are welcome on the SBCL ~
+ mailing lists, which you can find at ~
+ <http://sbcl.sourceforge.net/>.~:@>"
+ '((fmakunbound 'compile))))))
+(defun bug (format-control &rest format-arguments)
+ (error 'bug
+ :format-control format-control
+ :format-arguments format-arguments))
+
+;;; a condition for use in stubs for operations which aren't supported
+;;; on some platforms
;;;
-;;; E.g. in sbcl-0.7.0.5, it might be appropriate to do something
-;;; like
+;;; E.g. in sbcl-0.7.0.5, it might be appropriate to do something like
;;; #-(or freebsd linux)
;;; (defun load-foreign (&rest rest)
;;; (error 'unsupported-operator :name 'load-foreign))
;;; #+(or freebsd linux)
;;; (defun load-foreign ... actual definition ...)
;;; By signalling a standard condition in this case, we make it
-;;; possible for test code to distinguish between intentionally not
-;;; implemented and just screwed up somehow. (Before this condition
-;;; was defined, this was dealt with by checking for FBOUNDP, but
-;;; that didn't work reliably. In sbcl-0.7.0, a a package screwup
-;;; left the definition of LOAD-FOREIGN in the wrong package, so
-;;; it was unFBOUNDP even on architectures where it was supposed to
-;;; be supported, and the regression tests cheerfully passed because
-;;; they assumed that unFBOUNDPness meant they were running on an
-;;; system which didn't support the extension.)
+;;; possible for test code to distinguish between (1) intentionally
+;;; unimplemented and (2) unintentionally just screwed up somehow.
+;;; (Before this condition was defined, test code tried to deal with
+;;; this by checking for FBOUNDP, but that didn't work reliably. In
+;;; sbcl-0.7.0, a a package screwup left the definition of
+;;; LOAD-FOREIGN in the wrong package, so it was unFBOUNDP even on
+;;; architectures where it was supposed to be supported, and the
+;;; regression tests cheerfully passed because they assumed that
+;;; unFBOUNDPness meant they were running on an system which didn't
+;;; support the extension.)
(define-condition unsupported-operator (cell-error) ()
(:report
(lambda (condition stream)
(format stream
- "unsupported on this implementation: ~S"
+ "unsupported on this platform (OS, CPU, whatever): ~S"
(cell-error-name condition)))))
\f
;;;; restart definitions
#!+sb-doc
"Transfer control to a restart named ABORT, signalling a CONTROL-ERROR if
none exists."
- (invoke-restart (find-restart 'abort condition))
+ (invoke-restart (find-restart-or-control-error 'abort condition))
;; ABORT signals an error in case there was a restart named ABORT
;; that did not transfer control dynamically. This could happen with
;; RESTART-BIND.
#!+sb-doc
"Transfer control to a restart named MUFFLE-WARNING, signalling a
CONTROL-ERROR if none exists."
- (invoke-restart (find-restart 'muffle-warning condition)))
+ (invoke-restart (find-restart-or-control-error 'muffle-warning condition)))
(macrolet ((define-nil-returning-restart (name args doc)
#!-sb-doc (declare (ignore doc))
#!+sb-doc ,doc
;; FIXME: Perhaps this shared logic should be pulled out into
;; FLET MAYBE-INVOKE-RESTART? See whether it shrinks code..
- (when (find-restart ',name condition)
- (invoke-restart ',name ,@args)))))
+ (let ((restart (find-restart ',name condition)))
+ (when restart
+ (invoke-restart restart ,@args))))))
(define-nil-returning-restart continue ()
"Transfer control to a restart named CONTINUE, or return NIL if none exists.")
(define-nil-returning-restart store-value (value)
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