Mark H Weaver:
> In the interest of encouraging implementors, I'd recommend making a
> serious effort to rewrite the grammar to be as conceptually simple and
> clear as possible.

We certainly want it to be as simple and clear as possible.
I'll look over your suggestions that you posted, and
if you have others, I'd love to hear them.

...
> * Inconsistent syntax is used within {} in the ANTLR.  In most places
>   standard Scheme syntax is used, but in 'collecting_tail', the syntax
>   is more like C.

The *real* ANTLR code uses Java.  I used a program to translate them to
Scheme, and obviously it failed in some places. I'll need to look at it.

I'll reply more when I have a moment.

--- David A. Wheeler