I'm writing to ask how to redefine the "or" macro in ABCL.

I'm working on a project and there's one package in which I need "or" to mean something else than its usual definition.  I've tried simply to redefine it, but it doesn't work.  I understand that the Common Lisp spec requires special provision for that to be done --- such as the package-lock construct in SBCL.

How can I do that in ABCL?  I want to be able to do this within the code, for example, with in a "let" so that I can bound its scope.

Can anyone point me in the right direction?  My first --- failed --- experiment is below.

Thanks!

Peter

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A way that doesn't work.

slipstream:~ pcolsen$ abcl

Armed Bear Common Lisp 0.17.0

Java 1.5.0_20 Apple Inc.

Java HotSpot(TM) Client VM

Low-level initialization completed in 1.476 seconds.

Startup completed in 4.363 seconds.

Type ":help" for a list of available commands.

CL-USER(1): (or nil t)

T

CL-USER(2): (defmacro or (x) (+ 1 x))  ; My very own new "or"

OR

CL-USER(3): (or 3) ; Result should be 4

3

CL-USER(4): (or nil nil) ; My "or" should take only one argument.

NIL

CL-USER(5): (or nil t)

T

CL-USER(6):  ;;; Redefinition didn't work.

Peter Olsen

olsen@sigmaxi.net

I have loved the stars too fondly to be fearful of the night.

Galileo Galilei