IDEA-153437 Do not suggest to loop over the loop variable (and don't duplicate "new")

java/java-tests/testData/codeInsight/completion/variables/DontIterateOverLoopVariable.java

@@ -0,0 +1,12 @@
+import java.util.ArrayList;
+
+public class Test {
+  {
+
+    ArrayList<Node> nodes = new ArrayList<>();
+    for (Node n : n<caret>)
+  }
+
+}
+
+class Node {}

java/java-tests/testSrc/com/intellij/codeInsight/completion/VariablesCompletionTest.groovy

@@ -167,6 +167,11 @@ public class VariablesCompletionTest extends LightFixtureCompletionTestCase {
     assertStringItems("stringBuffer", "buffer");
   }
 
+  public void testDontIterateOverLoopVariable() throws Throwable {
+    configure()
+    myFixture.assertPreferredCompletionItems 0, 'nodes', 'new', 'null'
+  }
+
   public void testDuplicateSuggestionsFromUsage() {
     configure();
     assertStringItems("preferencePolicy", "policy", "aPreferencePolicy");