CS 227 lecture -*- Outline -*-

* debugging in Chez Scheme
-----------
>(define id
  (lambda (x) x))
> ;...
> (inspect id)
#<procedure id>           : show
  code:         (lambda (x) x)
#<procedure id>           : quit
-----------
	can abbreviate show to "s" and quit to "q"
	can also use "code" or "c" to look at the code

	to see more of the body of a larger procedures,
		use "code" and then "tail 2"
		
----------------
> (load "member.ss")
> (inspect member?)
#<procedure member?>                                              : show
  code:                  (lambda (item ls) (if (null? ls) #f ...))
#<procedure member?>                                              : code
(lambda (item ls) (if (null? ls) #f ...))                         : ?

   length(l) ........... display list length
   car ................. inspect car of pair
   cdr ................. inspect cdr of pair
   ref(r) .............. inspect [nth] car
   tail ................ inspect [nth] cdr
   show(s) ............. show [n] elements of list
   ?? .................. display more options

(lambda (item ls) (if (null? ls) #f ...))                         : tail 2
((if (null? ls) #f ((lambda (...) (...)) (equal? (...) item))))   : quit
>
----------------
	note that this code is code that is NOT exactly the same
		as what you typed, it has some things expanded, no comments,
		and is not formatted the way you formatted it

	the ... printed by the inspector means that there is more to see,
		but you have to use car, cdr, ref, or tail to see more.