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(defun print-destructuring-bind-error (condition stream) (format stream "Failed to destructure ~S against ~S~:[.~;:~%~:*~A~]" (lambda-list condition) (expression condition) (reason condition))) (define-condition destructuring-bind-error (error) ((%lambda-list :reader lambda-list :initarg :lambda-list :initform (error "Must provide LAMBDA-LIST.")) (%expression :reader expression :initarg :expression :initform (error "Must provide EXPRESSION.")) (%reason :reader reason :initarg :reason :initform nil)) (:documentation "Condition type responsible for destructuring errors signaled in DESTRUCTURING-BIND*.") (:report print-destructuring-bind-error)) (defun bind-modify-lambda-list (lambda-list gensym) (flet ((modify (elt) (cond ((atom elt) elt) ((= 1 (length elt)) elt) (t (list* (car elt) `(prog2 (setf ,gensym t) ,(cadr elt) (setf ,gensym nil)) (cddr elt)))))) (loop with modifyp = nil for elt in lambda-list collect (modify elt) if (and (member elt lambda-list-keywords) (member elt '(&key &optional))) do (setf modifyp t) else if (member elt lambda-list-keywords) do (setf modifyp nil)))) (defmacro destructuring-bind* (lambda-list expression &body body) "Like DESTRUCTURING-BIND, except destructuring errors are signaled as instances of condition type DESTRUCTURING-BIND-ERROR." (with-gensyms (in-body handle condition value) (let ((new-lambda-list (bind-modify-lambda-list lambda-list in-body))) `(let (,in-body) (flet ((,handle (,condition) (unless ,in-body (error (make-condition 'destructuring-bind-error :lambda-list ',lambda-list :expression ',expression :reason ,condition))))) (let ((,value ,expression)) (handler-bind ((error #',handle)) (destructuring-bind ,new-lambda-list ,value (setf ,in-body t) (locally ,@body)))))))))