Create a version of In with renamed (fresh) variables and
unify it to Out. Attributed variables (see section
8.1) have their attributes copied. The implementation of copy_term/2
can deal with infinite trees (cyclic terms). As pure Prolog cannot
distinguish a ground term from another ground term with exactly the same
structure, ground sub-terms are shared between In
and Out. Sharing ground terms does affect setarg/3.
to create a true copy of a term.
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