check for assignment to final field inside lambda (IDEA-123308)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/IDEA123308.java

@@ -0,0 +1,14 @@
+class Test {
+  private final int a;
+
+  public Test() {
+    a = 1;
+    run(() -> {
+      <error descr="Cannot assign a value to final variable 'a'">a</error> = 2;
+    });
+  }
+
+  public void run(Runnable r) {
+    r.run();
+  }
+}