[plt-scheme] compound unit duplicate names...prefix?

I think I got it. I'll just take the code that would use the compound
unit, and instead put it into a unit, itself. That way the test thingy
only has to use regular syntax for importing and exporting and can
assign prefixes. I'll just make a test^ signature it can export, and
that's all the compound unit has to export too.

I'll attach my example with that strategy applied. Any better strategies
are welcome of course.
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