KT-2184 Fix rendering of error types

#KT-2184 Fixed

compiler/frontend/src/org/jetbrains/jet/resolve/DescriptorRenderer.java

@@ -24,6 +24,7 @@ import org.jetbrains.jet.lang.resolve.DescriptorUtils;
 import org.jetbrains.jet.lang.resolve.name.FqName;
 import org.jetbrains.jet.lang.resolve.name.FqNameUnsafe;
 import org.jetbrains.jet.lang.resolve.scopes.receivers.ReceiverDescriptor;
+import org.jetbrains.jet.lang.types.ErrorUtils;
 import org.jetbrains.jet.lang.types.JetType;
 import org.jetbrains.jet.lang.types.TypeProjection;
 import org.jetbrains.jet.lang.types.Variance;
@@ -117,6 +118,9 @@ public class DescriptorRenderer implements Renderer<DeclarationDescriptor> {
         if (type == null) {
             return escape("[NULL]");
         }
+        else if (ErrorUtils.isErrorType(type)) {
+            return escape(type.toString());
+        }
         else if (JetStandardClasses.isUnit(type)) {
             return escape(JetStandardClasses.UNIT_ALIAS + (type.isNullable() ? "?" : ""));
         }

compiler/testData/renderer/ErrorType.kt

@@ -0,0 +1,3 @@
+val a : E = 0
+
+//internal final val a : [ERROR : E] defined in root package

compiler/tests/org/jetbrains/jet/resolve/DescriptorRendererTest.java

@@ -69,6 +69,10 @@ public class DescriptorRendererTest extends JetLiteFixture {
         doTest();
     }
 
+    public void testErrorType() throws IOException {
+        doTest();
+    }
+
     @Override
     protected String getTestDataPath() {
         return JetTestCaseBuilder.getTestDataPathBase() + "/renderer";