Reword an error message, and test that the error is produced.

dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart

Index: dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart b/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
index f4d8be4ca8f8eea05b7cb8e2e4ed9adf1c6247fe..e426b8e27ea376e875f045363b428ae456be485f 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
@@ -1737,7 +1737,8 @@ class NodeListener extends ElementListener {
       Node receiver = popNode();
       if (typeArguments != null) {
         receiver = new TypeAnnotation(receiver, typeArguments);
-        recoverableError('typeArguments not allowed here', node: typeArguments);
+        recoverableError('Error: type arguments are not allowed here',
+                         node: typeArguments);
       } else {
         Identifier identifier = receiver.asIdentifier();
         Send send = receiver.asSend();