IDEA-108113 Would be great to have an instanceof operator in keyword completion

java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionData.java

@@ -531,8 +531,19 @@ public class JavaCompletionData extends JavaAwareCompletionData {
     PsiElement prev = PsiTreeUtil.prevVisibleLeaf(position);
     if (prev == null) return false;
 
-    PsiExpression expr = PsiTreeUtil.getParentOfType(prev, PsiExpression.class);
-    return expr != null && expr.getTextRange().getEndOffset() == prev.getTextRange().getEndOffset();
+    PsiElement expr = PsiTreeUtil.getParentOfType(prev, PsiExpression.class);
+    if (expr != null && expr.getTextRange().getEndOffset() == prev.getTextRange().getEndOffset()) {
+      return true;
+    }
+
+    if (position instanceof PsiIdentifier && position.getParent() instanceof PsiLocalVariable) {
+      PsiType type = ((PsiLocalVariable)position.getParent()).getType();
+      if (type instanceof PsiClassType && ((PsiClassType)type).resolve() == null) {
+        return true;
+      }
+    }
+    
+    return false;
   }
 
   public static boolean isSuitableForClass(PsiElement position) {

java/java-tests/testData/codeInsight/completion/keywords/instanceofAfterStatementStart.java

@@ -0,0 +1,5 @@
+class Foo {
+  void test(Object o) {
+    o <caret>
+  }
+}

java/java-tests/testSrc/com/intellij/codeInsight/completion/KeywordCompletionTest.java

@@ -98,6 +98,7 @@ public class KeywordCompletionTest extends LightCompletionTestCase {
   public void testNewInMethodRefs() throws Exception { doTest(1, "new"); }
   public void testSpaceAfterInstanceof() throws Exception { doTest(false); }
   public void testInstanceofAfterUnresolved() throws Exception { doTest(1, "instanceof"); }
+  public void testInstanceofAfterStatementStart() throws Exception { doTest(1, "instanceof"); }
   public void testAbstractInInterface() throws Exception { doTest(1, "abstract"); }
   public void testCharInAnnotatedParameter() throws Exception { doTest(1, "char"); }
   public void testReturnInTernary() throws Exception { doTest(1, "return"); }