Re: code cool-down!

[Sam S. <sd...@gn...>]

Hi Bruno,

> * Bruno Haible <oe...@py...> [2005-06-06 20:02:28 +0200]:
>
> 2005-06-06  Sam Steingold  <sd...@gn...>
>
> 	* compelem.d (N_imagpart): use the normal Rational/Float contagion
> 	rules for reals
> 	* clispload.lsp (*expected-failures*): removed MISC.598
>
> This patch does not fit in a code cool-down phase because
>   1. it changes user-visible and documented behaviour,
>   2. it is not a unanimous bug fix. IMO
>      - it should be protected by a global variable *COMPLEX-NUMBERS-ANSI*
>        that is part of the big *ANSI* switch.
>      - it is the beginning of a new area of work. The whole scope of this
>        *COMPLEX-NUMBERS-ANSI* is about 2 weeks of work.

I disagree.
<http://www.lisp.org/HyperSpec/Body/fun_realpartcm_imagpart.html>
        If number is real, then realpart returns number and imagpart
        returns (* 0 number), which has the effect that the imaginary
        part of a rational is 0 and that of a float is a floating-point
        zero of the same format.

thus this is a bug fix for *FLOATING-POINT-RATIONAL-CONTAGION-ANSI*.
(thanks to Paul Dietz for pointing this out).

-- 
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