Re: re-using comma for read-time evaluation

> The macro-character @ allows evaluation of expressions
> at read-time and, afaik, is mostly used when globally
> defined constants occur in code to be compiled.

Actually "@@" is used for read-time evaluation. a single "@" 
is used to access constants, but it's evaluated at run time
(or at macro-expansion time in compiled code).

It's also used for idx0 literals, as in (setq x [@ 3]),
but that's OK. 

> I would like to use the @-character for something else
> but still think we need a means for read-time evaluation.
> How about re-using the comma character for this? I.e., a
> comma occuring outside a backquoted expression would have
> have the effect @ currently has. Also, I would define it
> in sysenv, so no need to libload libc/constants anymore.
>
> Any objections or thoughts?

One problem is that this would preclude the use of 
constants within backquote expressions. Admitedly, that's
rare, but it would necessitate an embarassing and convoluted
explanation in the documentation.

Another question is: what do you want to use @ for?

  -- Yann



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