Hello, my name is Pavel and I'm new to Racket :)

I'm playing with macros right now and get a strange error: "unmap failed".

What I'm trying to achieve in this program: expand (step x) into (+ (expt 2 
0) (expt 2 1) ...)

For small numbers everything is OK, but I get an error for (step 1000000)

What does this error mean and how can I fix it?

Code is in attachements. 

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Attachment: macro-step.rkt
Description: Binary data

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