testdata for IDEA-137893

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/regression/IDEA137893.java

@@ -0,0 +1,29 @@
+import java.util.Map;
+import java.util.Set;
+import java.util.function.UnaryOperator;
+
+final class Example {
+  Map<String, Map<String, Set<String>>> test(Map<String, Map<String, Set<String>>> mapOfMaps) {
+    return processMap(
+      mapOfMaps,
+      mapOfSets -> {
+        return processMap(
+          mapOfSets,
+          set -> {
+            if (true) {
+              return unionSets(set);
+            } else {
+              return unionSets(set);
+            }
+          });
+      });
+  }
+
+  <T> Set<T> unionSets(Set<T>... sets) {
+    return null;
+  }
+
+  <K, V> Map<K, V> processMap(Map<K, V> map, UnaryOperator<V> operator) {
+    return null;
+  }
+}