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Re: DrScheme version with source location tracking

On Wed, 7 Sep 2005, Per Bothner wrote:

I think it would be important to also show how SRFI-39-style
sharing is handled.

Since sharing is not part of the standard yet, I would like to defer implementation of this. If an implementor would like to take upon himself the pain of doing this, I would be glad to add a link to his implementation in
the document ;-)

It would also be nice if pairs output from
the expander would be eq? with pairs in the input, when that
is the case with existing implementations.

I'm pretty sure I understand neither the formulation of, nor the reason for, this desideratum... :-)