The Manual.txt says
There are no hygienic macros. No rational or
complex numbers. No unwind-protect and call-with-values.
but the CHANGES file says
Added unwind-protect (tehom)
Nevertheless, there is no unwind-protect (though there is a dynamic-wind).
Manual.txt also has
There is no call-with-values, values, nor dynamic-wind. Dynamic-wind in
the presence of continuations would require support from the abstract
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