[plt-scheme] contract & tail recursion

Hi -

Question regarding contracts:

I am reading up on contracts, and I just found that while `any` is tail
recursive, `any/c` is not.  Since any/c matches one and only one return
value and is not tail recursive, what about other tests that matches one and
only one value?  Such as `void?`, `null?`, `list?`, etc?  Are they tail
recursive?  I assume (and hope) they are, is my assumption correct?

Thanks,
yc
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