On Jun 2, 2016, at 11:47 AM, Jack Firth <jackhfi...@gmail.com> wrote:

> - Have #%top somehow magically figure out if it should make a new box or 
> reuse an existing one for the identifier it's given.

(call-with-future-miracle ...)

I'll think about it more — but my hunch is this problem is more related to 
parsing the program into an AST, not macro expansion per se. (Moreover, it's 
easy for me to see how certain adjustments to the parser grammar can make the 
variable names easier to find & extract; harder to see how to do the same with 
the expander.)

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