[plt-scheme] MzScheme Library support

When trying to create a library (r6rs) in MzScheme, I am getting this error:

export: misuse of unit keyword in: (export make push! pop! empty!)

I was trying to get a sample in r6rs to work.

Is the library implementation in MzScheme incomplete? Is it possible to
implement the r6rs libraries as a simple wrapper on MzScheme modules?

Thanks,

-- Vijay
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