testdata for IDEA-153284

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newLambda/IDEA153284.java

@@ -0,0 +1,19 @@
+import java.util.Iterator;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+class Test {
+  public void validRedSquiggles(Stream<List<Integer>> stream) {
+    final Iterator<Integer> x = concat(stream
+                                         .map(cs -> cs.iterator())
+                                         .collect(Collectors.toList()).iterator());
+    final Iterator<Integer> x1 = concat(stream
+                                          .map(List::iterator)
+                                          .collect(Collectors.toList()).iterator());
+  }
+
+  public static <T> Iterator<T> concat(final Iterator<? extends Iterator<? extends T>> inputs) {
+    return null;
+  }
+}