Breaking IntelliJ stream trace

exception.txt

java.lang.IncompatibleClassChangeError: Type StreamTraceTest$GeneratedEvaluationClass$8 is not a nest member of StreamTraceTest: types are in different packages

StreamTraceTest.java

import org.junit.Test;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class StreamTraceTest {
    @Test
    public void test() {
        AtomicInteger mapCount = new AtomicInteger(0);
        String result = Stream.of("red", "green", "blue")
                              .map(s -> {
                                  mapCount.incrementAndGet();
                                  return s.charAt(0);
                              })
                              .map(Object::toString)
                              .collect(Collectors.joining());
        System.out.println("result = " + result);
        System.out.println("mapCount = " + mapCount);
    }
}