Re: truth of %nil

[Daniel Kraft]

Hi Neil,

Neil Jerram wrote:
> Andy Wingo <address@hidden> writes:
> > Guile has treated %nil as false for quite some time:
> >
> >     scheme@(guile-user)> ,o interp #t
> >     scheme@(guile-user)> (if %nil 1 2)
> >     $1 = 2
>
> I'm sorry... you're completely right.  Brain storm on my part.
>
> But then I don't understand the cause of your suggestion.  Is it that
> master has somehow regressed, so as to cause (if %nil 1 2) => 1 ?

it seems so.  Doing just a

scheme@(guile-user)> (if %nil 1 2)
1

with a recent build (of at least my elisp branch, but that did not 
change anything in this respect of course) gives that answer.

Doing ,o interp #t as Andy did however also gives the right answer for 
me.  BTW, I've just changed my elisp compiler to use real nil instead of 
#f for nil, but now it doesn't have the right semantics of course 
(that's the motivation here).

Yours,
Daniel