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import java.util.stream.*;
 
class Ideone {
	public static void main (String[] args) {
 
		IntStream.empty().flatMap(x -> Stream.of(LongStream.empty()));
 
	}
}

Main.java:7: error: incompatible types: bad return type in lambda expression
		IntStream.empty().flatMap(x -> Stream.of(LongStream.empty()));
		                                        ^
    no instance(s) of type variable(s) T exist so that Stream<T> conforms to IntStream
  where T is a type-variable:
    T extends Object declared in method <T>of(T)
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty