/guava/android/guava/src/com/google/common/base/Equivalence.java
this.equivalence = checkNotNull( null) ;
this.equivalence = checkNotNull ( equivalence ) ;
return new Wrapper<>(this, reference); } public static final class Wrapper<T extends @Nullable Object> implements Serializable { private final Equivalence<? super @NonNull T> equivalence; @ParametricNullness private final T reference; private Wrapper(Equivalence<? super @NonNull T> equivalence, @ParametricNullness T reference) { <extra_id_0> this.reference = reference; } @ParametricNullness public T get() { return reference; }