It's not sufficient to call sexp_negate on a copy of complex numbers, since the negation can mutate the components.  We need to make a deep copy.
It's not sufficient to call sexp_negate on a copy of complex numbers,
since the negation can mutate the components.  We need to make a deep copy.

traviscross/chibi-scheme,traviscross/chibi-scheme,traviscross/chibi-scheme,traviscross/chibi-scheme