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This function returns a composite predicate which invokes the predicate pred1
when the predicate pred is true and which invokes the predicate pred2
otherwise.
For more information, see Selectors.
This function returns a composite evaluator whose evaluation is
equal to the evaluation of eval1 in the case where the predicate
pred is true on the evaluated instance and returns the
evaluation of eval2 otherwise.
For more information, see Selectors.