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(Re-)implementation of SWI Prolog's copy_term/4 (https://github.com/SWI-Prolog/swipl-devel/commit/b4bfdc2e07b2638ded67421d354db6cd574a42e4), for use with pre-8.4.2 versions (https://swi-prolog.discourse.group/t/ann-swi-prolog-8-4-2-stable/5004)
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| copy_term(VarsIn, In, VarsOut, Out) :- | |
| term_variables(In, AllVarsIn), | |
| maplist(list_to_ord_set, [AllVarsIn, VarsIn], [AllVarsInOrdSet, VarsInOrdSet]), | |
| ord_subtract(AllVarsInOrdSet, VarsInOrdSet, PreservedVars), | |
| copy_term(PreservedVars-VarsIn-In, PreservedVars-VarsOut-Out). |
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