Report errors and warnings for hiding elements, issue 572.

client/tests/client/layout/layout_tests.dart

Index: client/tests/client/layout/layout_tests.dart
diff --git a/client/tests/client/layout/layout_tests.dart b/client/tests/client/layout/layout_tests.dart
index 4e12f97f55b48fc7daec040294db35d18d97e24e..4567bb1f21c2921562006d37a123fc2312694e88 100644
--- a/client/tests/client/layout/layout_tests.dart
+++ b/client/tests/client/layout/layout_tests.dart
@@ -151,11 +151,11 @@ main() {
 // Note: to debug failures, best bet is to use GridLayoutDemo to run an
 // individual asyncTest and see the resulting layout.
 
-usingGrid(String example, void test(View grid)) {
+usingGrid(String example, void test_(View grid)) {
   final grid = createGrid(GridExamples.styles[example]);
   grid.addToDocument(document.body);
   window.setTimeout(() {
-    test(grid);
+    test_(grid);
     window.setTimeout(() {
       grid.removeFromDocument();
       callbackDone();