public static Predicate<ValueAttribute> isGenerateAbstract() {
    return IsGenerateAbstractPredicate.INSTANCE;
  }
Predicate on instance of DiscoveredAttribute that evaluates attribute isGenerateAbstract.
@return predicate on DiscoveredAttribute evaluates to 'isGenerateAbstract' attribute
value-processor/src/org/immutables/value/processor/meta/ValueAttributeFunctions.java