lambda: initial is assignable check; effectively final; acceptable context

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/ReassignUsedVars.java

@@ -0,0 +1,9 @@
+class XXX {
+  void foo() {
+    int k = 0;
+    int n = 2;
+    Runnable r = ()->{
+      <error descr="Variable used in lambda expression should be effectively final">k</error> = n;
+    };
+  }
+}