Do not check function names in scope to suggest name for introduce variable refactoring (local values can overload function names from upper scopes).

idea/src/org/jetbrains/jet/plugin/refactoring/JetNameValidatorImpl.java

@@ -22,6 +22,7 @@ import com.intellij.psi.PsiElement;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.cli.jvm.compiler.TipsManager;
 import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
+import org.jetbrains.jet.lang.descriptors.VariableDescriptor;
 import org.jetbrains.jet.lang.psi.JetExpression;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.jet.lang.psi.JetVisitorVoid;
@@ -107,7 +108,7 @@ public class JetNameValidatorImpl implements JetNameValidator {
                 Collection<DeclarationDescriptor> variants =
                         TipsManager.getVariantsNoReceiver(expression, myBindingContext);
                 for (DeclarationDescriptor variant : variants) {
-                    if (variant.getName().equals(name)) {
+                    if (variant.getName().equals(name) && variant instanceof VariableDescriptor) {
                         result.set(false);
                         return;
                     }

idea/testData/refactoring/nameSuggester/ArrayList.kt

@@ -0,0 +1,7 @@
+fun main(args : Array<String>) {
+    <selection>ArrayList<Int></selection> // Select this expression and introduce a variable, you get arrayList1 proposed as a name
+}
+/*
+arrayList
+list
+*/

idea/tests/org/jetbrains/jet/plugin/refactoring/nameSuggester/JetNameSuggesterTest.java

@@ -35,6 +35,10 @@ import java.util.Arrays;
  * Date: 07.02.12
  */
 public class JetNameSuggesterTest extends LightCodeInsightFixtureTestCase {
+    public void testArrayList() {
+        doTest();
+    }
+
     public void testGetterSure() {
         doTest();
     }