+
+;;; support for DESCRIBE tests
+(defstruct to-be-described a b)
+(defclass forward-describe-class (forward-describe-ref) (a))
+
+;;; DESCRIBE should run without signalling an error.
+(describe (make-to-be-described))
+(describe 12)
+(describe "a string")
+(describe 'symbolism)
+(describe (find-package :cl))
+(describe '(a list))
+(describe #(a vector))
+
+;;; The DESCRIBE-OBJECT methods for built-in CL stuff should do
+;;; FRESH-LINE and TERPRI neatly.
+(dolist (i (list (make-to-be-described :a 14) 12 "a string"
+ #0a0 #(1 2 3) #2a((1 2) (3 4)) 'sym :keyword
+ (find-package :keyword) (list 1 2 3)
+ nil (cons 1 2) (make-hash-table)
+ (let ((h (make-hash-table)))
+ (setf (gethash 10 h) 100
+ (gethash 11 h) 121)
+ h)
+ (make-condition 'simple-error)
+ (make-condition 'simple-error :format-control "fc")
+ #'car #'make-to-be-described (lambda (x) (+ x 11))
+ (constantly 'foo) #'(setf to-be-described-a)
+ #'describe-object (find-class 'to-be-described)
+ (find-class 'forward-describe-class)
+ (find-class 'forward-describe-ref) (find-class 'cons)))
+ (let ((s (with-output-to-string (s)
+ (write-char #\x s)
+ (describe i s))))
+ (unless (and (char= #\x (char s 0))
+ ;; one leading #\NEWLINE from FRESH-LINE or the like, no more
+ (char= #\newline (char s 1))
+ (char/= #\newline (char s 2))
+ ;; one trailing #\NEWLINE from TERPRI or the like, no more
+ (let ((n (length s)))
+ (and (char= #\newline (char s (- n 1)))
+ (char/= #\newline (char s (- n 2))))))
+ (error "misbehavior in DESCRIBE of ~S" i))))
+
+;;; TYPEP, SUBTYPEP, UPGRADED-ARRAY-ELEMENT-TYPE and
+;;; UPGRADED-COMPLEX-PART-TYPE should be able to deal with NIL as an
+;;; environment argument
+(typep 1 'fixnum nil)
+(subtypep 'fixnum 'integer nil)
+(upgraded-array-element-type '(mod 5) nil)
+(upgraded-complex-part-type '(single-float 0.0 1.0) nil)
+
+;;; We should have documentation for our extension package:
+(assert (documentation (find-package "SB-EXT") t))
+
+;;; DECLARE should not be a special operator
+(assert (not (special-operator-p 'declare)))
+
+;;; WITH-TIMEOUT should accept more than one form in its body.
+(handler-bind ((sb-ext:timeout #'continue))
+ (sb-ext:with-timeout 3
+ (sleep 2)
+ (sleep 2)))
+
+;;; DOCUMENTATION should return nil, not signal slot-unbound
+(documentation 'fixnum 'type)
+(documentation 'class 'type)
+(documentation (find-class 'class) 'type)