android/guava/src/com/google/common/util/concurrent/FluentFuture.java
@Deprecated
  public static <V> FluentFuture<V> from(FluentFuture<V> future) {
    return checkNotNull(future);
  }
@Deprecated
  public static <V> FluentFuture<V> from(FluentFuture<V> future) {
    return checkNotNull(future);
  }
Simply returns its argument.

@deprecated no need to use this
@since NEXT