Support compilation of Hello World

pkg/compiler/lib/src/deferred_load.dart

Index: pkg/compiler/lib/src/deferred_load.dart
diff --git a/pkg/compiler/lib/src/deferred_load.dart b/pkg/compiler/lib/src/deferred_load.dart
index db578393ae246abbb7b22cbb40dfd0d1994d48ec..b5a2cc5bb84fa7ae5bb7b0031636435df6218a2d 100644
--- a/pkg/compiler/lib/src/deferred_load.dart
+++ b/pkg/compiler/lib/src/deferred_load.dart
@@ -8,6 +8,10 @@ import 'common/backend_api.dart' show Backend;
 import 'common/tasks.dart' show CompilerTask;
 import 'common.dart';
 import 'compiler.dart' show Compiler;
+import 'constants/expressions.dart'
+    show
+        ConstantExpression,
+        ConstantExpressionKind;
 import 'constants/values.dart'
     show
         ConstantValue,
@@ -334,15 +338,13 @@ class DeferredLoadTask extends CompilerTask {
         TreeElements treeElements = analyzableElement.resolvedAst.elements;
         assert(treeElements != null);
 
-        treeElements.forEachConstantNode((Node node, _) {
+        treeElements.forEachConstantNode(
+            (Node node, ConstantExpression expression) {
           // Explicitly depend on the backend constants.
-          ConstantValue value =
-              backend.constants.getConstantValueForNode(node, treeElements);
-          if (value != null) {
-            // TODO(johnniwinther): Assert that all constants have values when
-            // these are directly evaluated.
-            constants.add(value);
-          }
+          ConstantValue value = backend.constants.getConstantValue(expression);
+          assert(invariant(node, value != null,
+              message: "No constant value for ${expression.toStructuredText()}."));
+          constants.add(value);
         });
       }
     }