IDEA-146009 Good code is yellow: "Unboxing may produce NPE" inside forEach lambda

java/java-analysis-impl/src/com/intellij/codeInspection/dataFlow/ControlFlowAnalyzer.java

@@ -1218,6 +1218,8 @@ public class ControlFlowAnalyzer extends JavaElementVisitor {
   }
 
   private void generateBoxingUnboxingInstructionFor(PsiExpression expression, PsiType expectedType) {
+    if (expectedType == PsiType.VOID) return;
+
     PsiType exprType = expression.getType();
 
     if (TypeConversionUtil.isPrimitiveAndNotNull(expectedType) && TypeConversionUtil.isPrimitiveWrapper(exprType)) {

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

@@ -0,0 +1,11 @@
+import java.util.List;
+
+class Example {
+  public void example(List<Foo> foos) {
+    foos.forEach(foo -> foo.bar = null);
+  }
+}
+
+class Foo {
+  public Long bar;
+}

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

@@ -105,4 +105,5 @@ public class DataFlowInspection8Test extends LightCodeInsightFixtureTestCase {
     doTest();
   }
 
+  public void testPrimitiveInVoidLambda() { doTest(); }
 }