Andy Wingo writes:

> So many possible answers, none of them great ;) For example, why have #t
> as a value at all -- I don't know :)

Thanks :-)

> But more directly: pair? only returns a boolean because the standard
> convention is that a function with a ? on the end returns a boolean.  A
> counter example is `assoc': it returns a pair or #f, and has no trailing
> `?'.

Okay.

> As to why have predicates -- well the idea is that a predicate doesn't
> do lookup and doesnt' retrieve a value, it just partitions its domain.
> You don't need to return the value because you already have the value --
> you passed it as the argument.  Also consider boolean? -- what should
> (boolean? #f) return?  Anyway that's how predicates are understood by
> most other Scheme programmers.

Yes, that makes sense.  I like the boolean? question.

>>         ("binutils-cross" ,xbinutils)
>> +       ("gcc" ,gcc)
>
> Why did you add GCC here?  Why was it not needed before?

If it was ever necessary, it is not anymore.  Removed.

> Other than this nit, LGTM.

Yay...looks like we're almost there!

Greetings,
Jan