Frank Buss  <fb@frank-buss.de> wrote:
+---------------
| thanks, this is what I want to implement. No GOTO, even not at the 
| machine level, only a real Lisp CPU with WHILE, IF and PROGN.
+---------------

By the way, if you allow even one global variable, then with PROGN,
IF, and WHILE you can efficiently emulate *arbitrary* patterns of
spaghetti-code GOTOs. [See William Wulf and Mary Shaw, "Global Variable
Considered Harmful", ACM "SIGPLAN Notices", Vol. 8, Issue 2 (Feb. 1973)
<http://portal.acm.org/citation.cfm?id=953355>.]

;-}


-Rob

p.s. IMHO, for a "real Lisp CPU" you also need abstraction,
a.k.a. LAMBDA and function call.

-----
Rob Warnock			<rpw3@rpw3.org>
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