testdata for IDEA-136887

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/regression/IDEA136887.java

@@ -0,0 +1,9 @@
+import java.util.Collection;
+import java.util.function.ToIntFunction;
+import java.util.stream.Collectors;
+
+class Test {
+  public static <T> int sum(Collection<? extends T> collection, ToIntFunction<? super T> mapper) {
+    return collection.stream().collect(Collectors.summingInt(mapper));
+  }
+}