The verify(expr1, expr2, record) calling sequence returns true if the expressions expr1 and expr2 are both of type record, and are equal as records. Two records are considered equal if they have the same slot names, and corresponding slot values are equal or unassigned.

The verify(expr1, expr2, record(ver)) calling sequence returns true if the expressions expr1 and expr2 are both of type record, and are equal with respect to the verification ver.  For a list of verifications, see verify.