Re: Equality predicates, signed zeroes, R5RS and R6RS

[Mike Gran]

> From:Mark H Weaver <address@hidden>
> To:Mike Gran <address@hidden>
> Cc:"address@hidden" <address@hidden>
> Sent:Monday, January 31, 2011 2:42 PM
> Subject:Re: Equality predicates, signed zeroes, R5RS and R6RS
> 
> Mike Gran <address@hidden> writes:
> > As an aside, as of a couple of months ago, it was possible to create
> > the following seven versions of zero in Guile using the default reader.
> >
> > 0, ±0.0, ±0.0±0.0i 
> 
> Really?  I don't understand how this could have happened.  mem2complex
> uses scm_make_rectangular to create complex numbers, and
> scm_make_rectangular calls scm_c_make_rectangular, which creates a real
> if the imaginary part is zero.

Sorry, I was completely wrong with that.  I was looking at the output for
few different Schemes, and I got confused.

As you say, Guile 2.0 only gets you, 0 and ±0.0. 

Sorry for the noise.
-Mike