/usr/share/common-lisp/source/closer-mop/closer-mop-shared.lisp is in cl-closer-mop 2:0.6-1.
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(defun required-args (lambda-list &optional (collector #'identity))
(loop for arg in lambda-list
until (member arg lambda-list-keywords)
collect (funcall collector arg)))
(defun ensure-finalized (class &optional (errorp t))
(if (typep class 'class)
(unless (class-finalized-p class)
(finalize-inheritance class))
(when errorp (error "~S is not a class." class)))
class)
(defun subclassp (class superclass)
(flet ((get-class (class) (etypecase class
(class class)
(symbol (find-class class)))))
(loop with class = (get-class class)
with superclass = (get-class superclass)
for superclasses = (list class)
then (set-difference
(union (class-direct-superclasses current-class) superclasses)
seen)
for current-class = (first superclasses)
while current-class
if (eq current-class superclass) return t
else collect current-class into seen
finally (return nil))))
#+(or allegro clozure ecl lispworks mcl)
(progn
;; validate-superclass for metaclass classes is a little bit
;; more tricky than for class metaobject classes because
;; we don't want to make all standard-classes compatible to
;; each other.
;; Our validate-superclass may get passed a class-prototype
;; as its second argument, so don't expect its readers to
;; yield useful information. (In ANSI parlance, "the
;; consequences are undefined...")
(defmacro define-validate-superclass-method (class superclass)
`(cl:defmethod validate-superclass ((class ,class) (superclass ,superclass))
(or (when (eq (class-of class) (find-class ',class))
(or (eq (class-of superclass) (find-class ',superclass))
(eq (class-of superclass) (find-class ',class))))
(call-next-method)
(when (eq (class-of superclass) (find-class ',superclass))
(validate-superclass class (class-prototype (find-class ',class))))))))
#+(or clisp scl)
(progn
(declaim (inline classp))
(define-compiler-macro classp (thing)
`(typep ,thing 'class))
(defun classp (thing)
(typep thing 'class)))
#+(or allegro clisp clozure ecl lispworks sbcl)
(progn ;;; New generic functions.
#+ecl
(cl:defgeneric specializer-direct-methods (metaobject))
#+ecl
(defclass funcallable-standard-class (clos:funcallable-standard-class)
((direct-methods :initform '() :reader specializer-direct-methods)))
(defclass standard-generic-function (cl:standard-generic-function)
(#+(or clozure ecl lispworks) (argument-order :accessor argument-order)
#-sbcl (initial-methods :initform '())
#+ecl (declarations :initarg :declarations :initform '()
:reader generic-function-declarations))
(:metaclass
#-lispworks funcallable-standard-class
#+lispworks clos:funcallable-standard-class)
#+clozure
(:default-initargs :name (gensym) :method-class (find-class 'standard-method)))
#+clozure
(progn
(cl:defgeneric method-function (method)
(:method ((method method))
(ccl:method-function method)))
(defclass standard-method (cl:standard-method)
((fn :initarg :real-function :reader method-function))))
#-ecl
(progn
(declaim (inline m-function))
(defun m-function (m)
(method-function m))
(define-compiler-macro m-function (m)
(handler-case (method-function m)
(error () `(the function (method-function real-method-function (the method ,m)))))))
(defun compute-argument-order (gf nof-required-args)
(loop with specialized-count = (make-array nof-required-args :initial-element 0)
for method in (generic-function-methods gf) do
(loop for specializer in (method-specializers method)
for index from 0
unless (eq specializer (find-class 't))
do (incf (svref specialized-count index)))
finally
(loop for arg in (generic-function-argument-precedence-order gf)
for pos = (position arg (generic-function-lambda-list gf))
when (> (svref specialized-count pos) 0)
collect pos into argument-order
finally (return-from compute-argument-order
(coerce argument-order 'simple-vector)))))
(defun parse-method-body (body error-form)
(loop with documentation = nil
for (car . cdr) = body then cdr
while (or (and cdr (stringp car))
(and (consp car) (eq (car car) 'declare)))
if (stringp car)
do (setq documentation
(if (null documentation) car
(warn "Too many documentation strings in ~S." error-form)))
else append (cdr car) into declarations
finally (return (values documentation declarations (cons car cdr)))))
#-sbcl (cl:defgeneric make-method-lambda (generic-function method lambda-expression environment))
#-ecl
(cl:defmethod make-method-lambda ((gf standard-generic-function) (method standard-method)
lambda-expression environment)
(declare (ignore environment) (optimize (speed 3) (space 0) (compilation-speed 0)))
#+(or clozure lispworks sbcl)
(when (only-standard-methods gf)
(return-from make-method-lambda (call-next-method)))
(let ((args (gensym)) (next-methods (gensym))
(more-args (gensym)) (method-function (gensym)))
(destructuring-bind
(lambda (&rest lambda-args) &body body)
lambda-expression
(declare (ignore lambda-args))
(assert (eq lambda 'lambda))
(values
`(lambda (,args ,next-methods &rest ,more-args)
(declare (dynamic-extent ,more-args)
(ignorable ,args ,next-methods ,more-args))
(flet ((call-next-method (&rest args)
(declare (dynamic-extent args))
(if ,next-methods
(apply (method-function (first ,next-methods))
(if args args ,args) (rest ,next-methods) ,more-args)
(apply #'no-next-method
(getf ,more-args :generic-function)
(getf ,more-args :method)
(if args args ,args))))
(next-method-p () (not (null ,next-methods))))
(declare (inline call-next-method next-method-p)
(ignorable #'call-next-method #'next-method-p))
(flet ((,method-function ,@(rest lambda-expression)))
(declare (inline ,method-function))
(apply #',method-function ,args))))
(let ((documentation (parse-method-body body lambda-expression)))
(nconc
(when documentation
(list :documentation documentation))
#+clozure '(:closer-patch t)
#-clozure '()))))))
#+(or clozure ecl lispworks)
(cl:defgeneric compute-applicable-methods-using-classes (generic-function classes)
(:method ((gf standard-generic-function) classes)
(labels ((subclass* (spec1 spec2 arg-spec)
(let ((cpl (class-precedence-list arg-spec)))
(declare (type list cpl))
(find spec2 (the list (cdr (member spec1 cpl :test #'eq))) :test #'eq)))
(method-more-specific-p (m1 m2)
(declare (type method m1 m2))
(loop for n of-type fixnum across (argument-order gf)
for spec1 = (nth n (method-specializers m1))
for spec2 = (nth n (method-specializers m2))
unless (eq spec1 spec2)
return (subclass* spec1 spec2 (nth n classes)))))
(let ((applicable-methods
(sort
(loop for method #-ecl of-type #-ecl method in (the list (generic-function-methods gf))
when (loop for class in classes
for specializer in (the list (method-specializers method))
if (typep specializer 'eql-specializer)
do (when (typep (eql-specializer-object specializer) class)
(return-from compute-applicable-methods-using-classes (values '() nil)))
else if (not (subclassp class specializer)) return nil
finally (return t))
collect method)
#'method-more-specific-p)))
(values applicable-methods t)))))
(cl:defgeneric compute-effective-method-function (gf effective-method options))
#-ecl
(cl:defmethod compute-effective-method-function ((gf generic-function) effective-method options)
(declare (optimize (speed 3) (space 0) (compilation-speed 0)))
(when #-clisp options
#+clisp (or (cdr (assoc :arguments options))
(cdr (assoc :duplicates options)))
(cerror "Ignore these options."
"This version of compute-effective-method-function does not support method combination options: ~S"
options))
(let ((all-t-specializers (required-args (generic-function-lambda-list gf)
(constantly (find-class 't))))
(args (gensym)))
(labels ((transform-effective-method (form)
(if (atom form) form
(case (car form)
(call-method (transform-effective-method
(let ((the-method (transform-effective-method (cadr form)))
(method-var (gensym)))
`(locally (declare (optimize (speed 3) (safety 0) (debug 0)))
(let ((,method-var ,the-method))
(declare (ignorable ,method-var))
(funcall (m-function ,(if (typep the-method 'method)
the-method method-var))
,args
,@(let ((subforms
(loop for subform in (the list (cddr form))
collect `',subform)))
(if subforms subforms '(())))
:generic-function ,gf
:method ,(if (typep the-method 'method)
the-method method-var)))))))
(make-method (when (cddr form)
(error "Incorrect make-method form: ~S." form))
(let ((method-class (generic-function-method-class gf)))
#+allegro (ensure-finalized method-class)
(multiple-value-bind
(method-lambda method-options)
(make-method-lambda
gf (class-prototype method-class)
`(lambda (&rest ,args)
(declare (dynamic-extent ,args) (ignorable ,args))
,(transform-effective-method (cadr form))) nil)
(apply #'make-instance
method-class
:qualifiers '()
:specializers all-t-specializers
:lambda-list (generic-function-lambda-list gf)
:function (compile nil method-lambda)
method-options))))
(t (mapcar #'transform-effective-method (the list form)))))))
(let ((emf-lambda `(lambda (&rest ,args)
(declare (dynamic-extent ,args) (ignorable ,args))
,(transform-effective-method effective-method))))
(multiple-value-bind (function warnings failure)
(compile nil emf-lambda)
(declare (ignore warnings))
(assert (not failure))
function)))))
#+clozure
(cl:defgeneric compute-effective-method (generic-function combination methods))
#+clozure
(cl:defgeneric compute-discriminating-function (generic-function))
#+ecl
(cl:defgeneric compute-effective-method (generic-function combination methods)
(:method ((gf generic-function) combination methods)
(clos:compute-effective-method gf combination methods)))
#+ecl
(cl:defgeneric compute-applicable-methods (gf arguments)
(:method ((gf generic-function) arguments)
(cl:compute-applicable-methods gf arguments)))
(defun get-emf (gf args nof-required-args)
(declare (optimize (speed 3) (space 0) (compilation-speed 0)))
(let ((applicable-methods (compute-applicable-methods gf (subseq args 0 nof-required-args))))
(if applicable-methods
(multiple-value-bind
(effective-method options)
(compute-effective-method
gf (generic-function-method-combination gf)
applicable-methods)
(compute-effective-method-function gf effective-method options))
(lambda (&rest args)
(declare (dynamic-extent args))
(apply #'no-applicable-method gf args)))))
(defun get-emf-using-classes (gf args classes nof-required-args)
(declare (type generic-function gf) (type list args classes)
(optimize (speed 3) (space 0) (compilation-speed 0)))
(multiple-value-bind
(applicable-methods validp)
(compute-applicable-methods-using-classes gf classes)
(unless validp
(setq applicable-methods
(compute-applicable-methods gf (subseq args 0 nof-required-args))))
(values
(if applicable-methods
(multiple-value-bind
(effective-method options)
(compute-effective-method
gf (generic-function-method-combination gf)
applicable-methods)
(compute-effective-method-function gf effective-method options))
(lambda (&rest args)
(declare (dynamic-extent args))
(apply #'no-applicable-method gf args)))
validp)))
(defvar *standard-gfs*
(list #'compute-applicable-methods #'compute-applicable-methods-using-classes
#'compute-effective-method #'compute-effective-method-function #'make-method-lambda
#+allegro #'compute-discriminating-function))
(defun only-standard-methods (gf &rest other-gfs)
(declare (dynamic-extent other-gfs) (optimize (speed 3) (space 0) (compilation-speed 0)))
(loop for other-gf in (or other-gfs *standard-gfs*)
always (loop for method in (generic-function-methods other-gf)
for specializer = (first (method-specializers method))
if (and (typep specializer 'class)
(subclassp specializer (find-class 'standard-generic-function))
(not (eq specializer (find-class 'standard-generic-function)))
(typep gf specializer))
return nil
else if (and (typep specializer 'eql-specializer)
(eql (eql-specializer-object specializer) gf))
return nil
finally (return t))))
(defun methods-all-the-same-specializers (gf)
(declare (optimize (speed 3) (space 0) (compilation-speed 0)))
(loop with template = (first (generic-function-methods gf))
for method in (rest (generic-function-methods gf))
always (loop for spec1 in (method-specializers template)
for spec2 in (method-specializers method)
always (etypecase spec1
(class (etypecase spec2
(class (eq spec1 spec2))
(eql-specializer nil)))
(eql-specializer
(etypecase spec2
(class nil)
(eql-specializer
(eql (eql-specializer-object spec1)
(eql-specializer-object spec2)))))))))
(defun compute-discriminator (gf compute-native-discriminator)
(declare (optimize (speed 3) (space 0) (compilation-speed 0)))
(let ((nof-required-args (length (required-args (generic-function-lambda-list gf))))
discriminator)
#+(or clozure ecl lispworks)
(setf (argument-order gf)
(compute-argument-order gf nof-required-args))
(flet ((discriminate (emf-setter args &optional (classes (loop for arg in args
repeat nof-required-args
collect (class-of arg))))
(declare (type list args classes) (type function emf-setter))
(multiple-value-bind (emf validp) (get-emf-using-classes gf args classes nof-required-args)
(funcall emf-setter (if validp emf (lambda (&rest args)
(declare (dynamic-extent args))
(apply (the function (get-emf gf args nof-required-args)) args))))
(apply (the function emf) args))))
(when (only-standard-methods gf #'compute-applicable-methods #'compute-applicable-methods-using-classes)
(setq discriminator
(if (only-standard-methods
gf #'compute-effective-method #'compute-effective-method-function #'make-method-lambda
#+allegro #'compute-discriminating-function)
(funcall compute-native-discriminator)
(let ((argument-order
#-(or clozure ecl lispworks) (compute-argument-order gf nof-required-args)
#+(or clozure ecl lispworks) (argument-order gf)))
(cond ((null (generic-function-methods gf))
(lambda (&rest args)
(declare (dynamic-extent args))
(apply #'no-applicable-method gf args)))
((methods-all-the-same-specializers gf)
(let ((specializers (method-specializers (first (generic-function-methods gf))))
(effective-method-function nil))
(declare (type list specializers))
(lambda (&rest args)
(declare (dynamic-extent args) (optimize (speed 3) (safety 0) (debug 0)
(compilation-speed 0)))
(cond ((loop for arg in args
for spec in specializers
always (etypecase spec
(class (typep arg spec))
(eql-specializer (eql arg (eql-specializer-object spec)))))
(if effective-method-function
(apply (the function effective-method-function) args)
(discriminate (lambda (emf) (setq effective-method-function emf)) args)))
(t (apply #'no-applicable-method gf args))))))
((= (length argument-order) 1)
(let ((dispatch-argument-index (svref argument-order 0))
(emfs (make-hash-table :test #'eq)))
(declare (type hash-table emfs) (type fixnum dispatch-argument-index))
(lambda (&rest args)
(declare (dynamic-extent args) (optimize (speed 3) (safety 0) (debug 0)
(compilation-speed 0)))
(let* ((dispatch-class (class-of (nth dispatch-argument-index args)))
(effective-method-function (gethash dispatch-class emfs)))
(if effective-method-function
(apply (the function effective-method-function) args)
(discriminate (lambda (emf) (setf (gethash dispatch-class emfs) emf)) args)))))))))))
(if discriminator discriminator
(let ((emfs (make-hash-table :test #'equal)))
(declare (type hash-table emfs))
(lambda (&rest args)
(declare (dynamic-extent args) (optimize (speed 3) (safety 0) (debug 0)
(compilation-speed 0)))
(let* ((classes (loop for arg in args
repeat nof-required-args
collect (class-of arg)))
(effective-method-function (gethash (the list classes) emfs)))
(if effective-method-function
(apply (the function effective-method-function) args)
(discriminate (lambda (emf) (setf (gethash (the list classes) emfs) emf)) args classes)))))))))
#-(or clisp lispworks)
(cl:defmethod compute-discriminating-function ((gf standard-generic-function))
(if (eq (class-of gf) (find-class 'standard-generic-function))
(lambda (&rest args)
(declare (dynamic-extent args))
(let ((discriminator (compute-discriminator gf #'call-next-method)))
(set-funcallable-instance-function gf discriminator)
(apply discriminator args)))
(compute-discriminator gf #'call-next-method)))
#+(or clisp lispworks)
(cl:defmethod compute-discriminating-function ((gf standard-generic-function))
(compute-discriminator gf #'call-next-method))
#-sbcl
(progn
(defun maybe-remove-initial-methods (function-name)
(let ((generic-function (ignore-errors (fdefinition function-name))))
(when (and generic-function (typep generic-function 'standard-generic-function))
(dolist (method (slot-value generic-function 'initial-methods))
(remove-method generic-function method)))))
#-(or allegro lispworks)
(defmacro without-redefinition-warnings (&body body)
`(progn ,@body))
#+allegro
(defmacro without-redefinition-warnings (&body body)
`(excl:without-redefinition-warnings ,@body))
#+lispworks
(defmacro without-redefinition-warnings (&body body)
`(let ((dspec:*redefinition-action* :quiet)) ,@body))
(defmacro defgeneric (&whole form name (&rest args) &body options &environment env)
(loop initially (unless (every #'consp options)
(error "Illegal options in defgeneric form ~S." form))
with generic-function-class-name = nil
for option in options
if (eq (car option) :generic-function-class) do
(when (or (cddr option) (null (cadr option)) (not (symbolp (cadr option)))
generic-function-class-name)
(error "Illegal or duplicate :generic-function-class option in defgeneric form ~S." form))
(setq generic-function-class-name (cadr option))
end
if (eq (car option) :method) collect option into method-options
else collect option into non-method-options
finally
(let ((gf (gensym))
(non-standard (when generic-function-class-name
(let ((standard-generic-function (find-class 'standard-generic-function t env))
(this-generic-function (find-class generic-function-class-name t env)))
(and (subclassp this-generic-function standard-generic-function)
(not (eq this-generic-function standard-generic-function)))))))
(return-from defgeneric
`(progn (maybe-remove-initial-methods ',name)
,(if non-standard
`(eval-when (:compile-toplevel :load-toplevel :execute)
(cl:defgeneric ,name ,args ,@non-method-options))
`(progn
(eval-when (:compile-toplevel)
(cl:defgeneric ,name ,args ,@non-method-options))
(eval-when (:load-toplevel :execute)
(without-redefinition-warnings
(cl:defgeneric ,name ,args ,@options)))))
(let ((,gf (fdefinition ',name)))
,(when non-standard
`(setf (slot-value ,gf 'initial-methods)
(list ,@(loop for method-option in method-options
collect `(defmethod ,name ,@(cdr method-option))))))
,gf)))))))
#+sbcl
(defmacro defgeneric (&whole form name (&rest args) &body options)
(unless (every #'consp options)
(error "Illegal generic function options in defgeneric form ~S." form))
(let ((options-without-methods (remove :method options :key #'car :test #'eq)))
`(progn
(eval-when (:compile-toplevel)
(cl:defgeneric ,name ,args ,@options-without-methods))
(eval-when (:load-toplevel :execute)
(cl:defgeneric ,name ,args ,@options)))))
#-sbcl
(progn
(defun create-gf-lambda-list (method-lambda-list)
(loop with stop-keywords = '#.(remove '&optional lambda-list-keywords)
for arg in method-lambda-list
until (member arg stop-keywords)
collect arg into gf-lambda-list
finally (return (let (rest)
(cond ((member '&key method-lambda-list)
(nconc gf-lambda-list '(&key)))
((setq rest (member '&rest method-lambda-list))
(nconc gf-lambda-list (subseq rest 0 2)))
(t gf-lambda-list))))))
(defun extract-specializers (specialized-args form)
(loop for specializer-name in (extract-specializer-names specialized-args)
collect (typecase specializer-name
(symbol `(find-class ',specializer-name))
(class specializer-name)
(cons (cond
((> (length specializer-name) 2)
(error "Invalid specializer ~S in defmethod form ~S."
specializer-name form))
((eq (car specializer-name) 'eql)
`(intern-eql-specializer ,(cadr specializer-name)))
(t (error "Invalid specializer ~S in defmethod form ~S."
specializer-name form))))
(t (error "Invalid specializer ~S in defmethod form ~S."
specializer-name form)))))
(defun load-method (name gf-lambda-list type qualifiers specializers lambda-list function options)
(let* ((gf (if (fboundp name) (fdefinition name)
(ensure-generic-function name :lambda-list gf-lambda-list :generic-function-class type)))
(method (apply #'make-instance
(generic-function-method-class gf)
:qualifiers qualifiers
:specializers specializers
:lambda-list lambda-list
:function function
options)))
(add-method gf method)
method)))
(define-condition defmethod-without-generic-function (style-warning)
((name :initarg :name :reader dwg-name))
(:report (lambda (c s) (format s "No generic function present when encountering a defmethod for ~S. Assuming it will be an instance of standard-generic-function." (dwg-name c)))))
(define-symbol-macro warn-on-defmethod-without-generic-function
#-sbcl t
#+sbcl nil)
#-sbcl
(defmacro defmethod (&whole form name &body body &environment env)
(loop with generic-function = (when (fboundp name) (fdefinition name))
initially
(when (macroexpand 'warn-on-defmethod-without-generic-function env)
(unless generic-function
(warn 'defmethod-without-generic-function :name name)))
(unless (typep generic-function 'standard-generic-function)
(return-from defmethod `(cl:defmethod ,@(cdr form))))
#-ecl
(when (only-standard-methods generic-function)
(return-from defmethod `(cl:defmethod ,@(cdr form))))
for tail = body then (cdr tail)
until (listp (car tail))
collect (car tail) into qualifiers
finally
(destructuring-bind
((&rest specialized-args) &body body) tail
(multiple-value-bind
(documentation declarations main-body)
(parse-method-body body form)
(let* ((lambda-list (extract-lambda-list specialized-args))
(gf-lambda-list (create-gf-lambda-list lambda-list))
(specializers (extract-specializers specialized-args form))
(method-class (generic-function-method-class generic-function)))
#+allegro (ensure-finalized method-class)
(multiple-value-bind
(method-lambda method-options)
(make-method-lambda generic-function (class-prototype method-class)
`(lambda ,lambda-list
,@(when documentation (list documentation))
(declare ,@declarations)
(declare (ignorable ,@(loop for arg in specialized-args
until (member arg lambda-list-keywords)
when (consp arg) collect (car arg))))
(block ,(if (consp name) (cadr name) name) ,@main-body))
env)
(return-from defmethod
`(load-method ',name ',gf-lambda-list ',(type-of generic-function)
',qualifiers (list ,@specializers) ',lambda-list
(function ,method-lambda) ',method-options))))))))
#+sbcl
(defmacro defmethod (&whole form name &body body &environment env)
(declare (ignore body))
(let ((generic-function (when (fboundp name) (fdefinition name))))
(when (macroexpand 'warn-on-defmethod-without-generic-function env)
(unless generic-function
(warn 'defmethod-without-generic-function :name name)))
`(cl:defmethod ,@(cdr form))))
)
#+(or allegro clisp cmu mcl scl)
(defun ensure-method (gf lambda-expression
&key (qualifiers ())
(lambda-list (cadr lambda-expression))
(specializers (required-args lambda-list (constantly (find-class 't)))))
(let ((form `(defmethod ,(generic-function-name gf) ,@qualifiers
,(loop for specializer in specializers
for (arg . rest) on lambda-list
collect `(,arg ,specializer) into args
finally (return (nconc args rest)))
,@(cddr lambda-expression))))
#+(or allegro clisp cmu scl)
(funcall (compile nil `(lambda () ,form)))
#+mcl (eval form)))
#+(or clozure ecl lispworks sbcl)
(defun ensure-method (gf lambda-expression
&key (method-class (generic-function-method-class gf))
(qualifiers ())
(lambda-list (cadr lambda-expression))
(specializers (required-args lambda-list (constantly (find-class 't)))))
(multiple-value-bind
(method-lambda method-args)
(make-method-lambda
gf (class-prototype method-class)
lambda-expression ())
(let ((method (apply #'make-instance
method-class
:qualifiers qualifiers
:lambda-list lambda-list
:specializers specializers
:function
#-ecl (compile nil method-lambda)
#+ecl (coerce method-lambda 'function)
method-args)))
(add-method gf method)
method)))
;; The following can be used in direct-slot-definition-class to get the correct initargs
;; for a slot. Use it like this:
;;
;; (defmethod direct-slot-definition-class
;; ((class my-standard-class) &rest initargs)
;; (declare (dynamic-extent initargs))
;; (destructuring-bind
;; (&key key-of-interest &allow-other-keys)
;; (fix-slot-initargs initargs)
;; ...))
(defvar *standard-slot-keys*
'(:name :documentation
:initargs :initform :initfunction
:readers :writers))
#+(or cmu ecl scl)
(define-modify-macro nconcf (&rest lists) nconc)
(defun fix-slot-initargs (initargs)
#+(or allegro clisp clozure lispworks mcl sbcl)
initargs
#+(or cmu ecl scl)
(let* ((counts (loop with counts
for (key nil) on initargs by #'cddr
do (incf (getf counts key 0))
finally (return counts)))
(keys-to-fix (loop for (key value) on counts by #'cddr
if (> value 1) collect key)))
(if keys-to-fix
(let ((multiple-standard-keys
(intersection keys-to-fix *standard-slot-keys*)))
(if multiple-standard-keys
(error "Too many occurences of ~S in slot initargs ~S."
multiple-standard-keys initargs)
(loop with fixed-keys
for (key value) on initargs by #'cddr
if (member key keys-to-fix)
do (nconcf (getf fixed-keys key) (list value))
else nconc (list key value) into fixed-initargs
finally (return (nconc fixed-initargs fixed-keys)))))
initargs)))
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