Brilliant.  This is exactly what I needed, thank you.

On Wed, Aug 15, 2018 at 1:31 AM, gfb <g...@cs.toronto.edu> wrote:

> You're losing the binding information by doing syntax->datum. Here's a
> quick change to get you unstuck:
>
> ...
>                        (only-in racket/list partition flatten
> append-map))) ; Include append-map
> ...
>                (partition (syntax-parser [(flag _) (syntax-e #'flag)])
>                           (syntax->list #'(item ...)))])
>            (define flat-mand (append-map (syntax-parser [(_ (kw contr))
> (list #'kw #'contr)])
>                                          mandatory))
>            (define flat-opt (append-map (syntax-parser [(_ (kw contr))
> (list #'kw #'contr)])
>                                         optional))
> ...
>
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