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db_reference/1
db_reference(+Term)
since release 4.1
Term is currently instantiated to
a compound term with principal functor '$ref'/2
denoting a unique reference to a dynamic clause.
term
| ?- db_reference(9). no | ?- db_reference(_X). no | ?- assertz(foo(a), R), db_reference(R). R = '$ref'(1816730,128)
None.