IDEA-139301 "Constant conditions & exceptions" flaggs nullable expression when implementing a method returning void

java/java-tests/testData/inspection/dataFlow/fixture/NullableVoidLambda.java

@@ -0,0 +1,12 @@
+import org.jetbrains.annotations.Nullable;
+
+class Example {
+  void foo() {
+    Runnable runnable = () -> bar();
+  }
+
+  @Nullable
+  String bar() {
+    return null;
+  }
+}

java/java-tests/testSrc/com/intellij/codeInspection/DataFlowInspection8Test.java

@@ -77,6 +77,7 @@ public class DataFlowInspection8Test extends LightCodeInsightFixtureTestCase {
   }
 
   public void testMethodReferenceOnNullable() { doTest(); }
+  public void testNullableVoidLambda() { doTest(); }
 
   public void testNullableForeachVariable() {
     setupCustomAnnotations();