From: Javier
Subject: Redefining alien types on SBCL
Date: Fri, 01 Sep 2006 00:01:19 +0000
Message-ID: <1157068879.292736.34090@i3g2000cwc.googlegroups.com>

If I do this in slime-repl:

(define-alien-type nil (struct foo (str c-string)))

(define-alien-type nil
       (struct foo
         (a int)
         (b (array (* (struct foo)) 100))))

(with-alien ((f (struct foo)))
	   (slot (deref (slot f 'b) 7) 'a))



and I got the error:

There is no slot named B in #<SB-ALIEN-INTERNALS:ALIEN-RECORD-TYPE
(STRUCT FOO

   (STR

    C-STRING))>.

This is an inconvenience because I'd like to experiment in the repl.
How can avoid this error?

Note: the same thing happens when redefining generic methods.