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RE: Implementing 2d-put! and 2d-get in DrScheme



I wrote:
> (define system-properties (make-hash-table-weak))
...
>             (let ((new-bucket (make-hash-table-weak)))

...which works with DrScheme v103.  For v199, replace the two occurrences of
(make-hash-table-weak) with (make-hash-table 'weak).