+
+(defmacro with-ignore-errors (&rest forms)
+ `(progn
+ ,@(mapcar
+ (lambda (x) (list 'ignore-errors x))
+ forms)))
+
+(defmacro ppmx (form)
+ "Pretty prints the macro expansion of FORM."
+ `(let* ((exp1 (macroexpand-1 ',form))
+ (exp (macroexpand exp1))
+ (*print-circle* nil))
+ (cond ((equal exp exp1)
+ (format t "~&Macro expansion:")
+ (pprint exp))
+ (t (format t "~&First step of expansion:")
+ (pprint exp1)
+ (format t "~%~%Final expansion:")
+ (pprint exp)))
+ (format t "~%~%")
+ (values)))
+
+(defmacro defconst (symbol value &optional doc)
+ `(defconstant ,symbol (if (boundp ',symbol)
+ (symbol-value ',symbol)
+ ,value)
+ ,@(when doc (list doc))))