Re: stupid mail about letrec

[Per Bothner]

Thomas Bushnell, BSG wrote:
> Sven Hartrumpf <address@hidden> writes:
>
> > > So chicken and MIT-scheme don't give you an error for the letrec
> > > expression that you quoted before?
> >
> > No, all return 8 for (letrec ((a 2) (b (* a 4))) b).
> > Also mzscheme, bigloo, chez, sisc, scsh, gauche, gambit.
> > Only SCM behaves like guile.
> > This might make an interesting posting in comp.lang.scheme :-)
>
>
> Yes, but it is an error nontheless.

But an error that implementations are not requied to detect.

And it is not unreasonable to consider this an implementation
extension.
--
        --Per Bothner
address@hidden   http://www.bothner.com/per/