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From: michaelm@bcsaic.UUCP (michael maxwell)
Newsgroups: net.lang.lisp
Subject: Changing syntax of characters in Franz
Message-ID: <555@bcsaic.UUCP>
Date: Thu, 29-May-86 18:30:56 EDT
Article-I.D.: bcsaic.555
Posted: Thu May 29 18:30:56 1986
Date-Received: Mon, 2-Jun-86 16:55:29 EDT
Organization: Boeing Computer Services AI Center, Seattle
Lines: 29

This is on Franz Lisp (v38.91) under BSD 4.2 on a Sun II...

(1) I would like to set a control character to do a (return) from a break 
level, using 'setsyntax.'  It doesn't work; Lisp says
	No prog to return from
(Nor can a function called from the break level itself call (return)--same
error msg.)  Likewise, you can't set a control character to do a (retbrk) from 
a break level with 'setsyntax'; the error message in this case is:
	apply: Undefined Function   retbrk
However, you can set a control character to do a (reset).
Short of creating my own break loop, is there another way I can get a control
character to do a return?  i.e. to continue the function in which break was
called, not reset to the top level...

(2) Some characters seem to be impossible to reset as vmacros using 
'setsyntax.'  I can understand why you can't reset ^Y, etc., but why not ^R?  
According to 'getsyntax', the syntax of ^R has been reset, but the reader
seems to ignore it.

(3) Assuming a character's syntax has been reset as a "vmacro," how can you 
find out exactly what function the character has been set to (short of typing 
it and observing what Lisp does)?  Is there a way for a program to find out?

(4) Finally, has anyone had any luck in changing the readtable in compiled
code?  (I think  I've asked this before, w/o luck.)
-- 
Mike Maxwell
Boeing Artificial Intelligence Center
	...uw-beaver!uw-june!bcsaic!michaelm