[plt-scheme] datum->syntax rules

On Mon, Aug 4, 2008 at 8:43 PM, Chongkai Zhu <czhu at cs.utah.edu> wrote:

> The "_" in "(_ test then else)" is a special pattern that match's anything.
> So the #'_ given to datum->syntax is not binding to "if-it". This is a PLT
> v4 change. I think you want:
>

Thanks Chongkai for the explanation.

In that case, why does the first version work?  Does #'_ sometimes binds
against the identifier and sometimes not?

Thanks,
yc
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