Re: Lexical binding

[Juanma Barranquero]

On Mon, Apr 4, 2011 at 01:32, Christian Ohler <address@hidden> wrote:

> How about:
>
>    (loop for (name width . rest) in bs-attributes-list
>          do (ignore name rest)
>          if (numberp width) sum width)

All these are just workarounds, none of them pretty. I think I'll go
with using nil in the destructuring.

> IIRC, Common Lisp distinguishes between (declare (ignore ...)) and (declare
> (ignorable ...)).  The latter is useful for macros that introduce bindings
> that may or may not be used.

Yes, "3.8 The Evaluation and Compilation Dictionary", "Declaration
IGNORE, IGNORABLE" in the Common Lisp Hyperspec.

> If this is the
> case, then I agree it's not quite expressive enough, and requires idioms
> like the above (with many macros, not just `loop').

Agreed.

    Juanma