error:uninstantiation_error/1

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Predicate uninstantiation_error/1

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swipl
- library

uninstantiation_error(+Culprit): An argument is over-instantiated. This error is used for output arguments whose value cannot be known upfront. For example, the goal open(File, read, input) cannot succeed because the system will allocate a new unique stream handle that will never unify with input.