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[Gcl-devel] Re: [Axiom-developer] common-lisp and GCL-2.6.8pre *features
From: |
Stephen Wilson |
Subject: |
[Gcl-devel] Re: [Axiom-developer] common-lisp and GCL-2.6.8pre *features* |
Date: |
11 Aug 2007 21:23:27 -0400 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.4 |
Gabriel Dos Reis <address@hidden> writes:
> >(member :common-lisp *features*)
>
> NIL
>
> >(member :gcl *features*)
>
> (:GCL :AKCL :COMMON :KCL)
>
> >#-:common-lisp foo
>
> Error: The variable FOO is unbound.
> Fast links are on: do (si::use-fast-links nil) for debugging
> Error signalled by EVAL.
> Broken at EVAL. Type :H for Help.
>
>
>
>
> I would have expected the system NOT to try to evaluate foo.
>From the hyperspec:
#- is like #+ except that it skips the expression if the test succeeds; that
is,
#-test expression == #+(not test) expression
In other words, "#-:common-lisp foo" means "evaluate foo iff
:common-lisp is not on *features*".
Steve