[plt-scheme] Mutation of expansion time values not visible outside module

--- Matthew Flatt <mflatt at cs.utah.edu> wrote:

> The first time around, uses of the `add-val!' within the
> module are
> expanded, and they perform a side effect. But only the
> expansion result
> remains, so there's no effect for future compile-time
> runs.

Of course!  Thanks both to you and Robby, my understanding
of macros has inched up a bit.  Give me a century and I'll
master them! :-)

Cheers,
Noel

PS: I must admit some surprise no-one has scolded me on the
somewhat sleazy use of 3-D values.

Email: noelwelsh <at> yahoo <dot> com   noel <at> untyped <dot> com
AIM: noelhwelsh
Blogs: http://monospaced.blogspot.com/  http://www.untyped.com/untyping/

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