> The trouble, sadly, is that this grammar is ambiguous. In
>   (for ([(x y) s])
>     ....)
> should (x y) be parsed as a single match pattern or as two binders for a 
> two-valued sequence (such as one produced by in-hash, for example)?

Unless I'm being dense, (x y) isn't a valid single match pattern?

[Quasipatterns like `(x y) or `(,x ,y) would be.]

But even if it is grammatically possible, like I said at the end, I'm
not sure it's worthwhile.

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