Error produced for missing var, final, const or type on field declarations.

lib/compiler/implementation/scanner/listener.dart

Index: lib/compiler/implementation/scanner/listener.dart
diff --git a/lib/compiler/implementation/scanner/listener.dart b/lib/compiler/implementation/scanner/listener.dart
index bc1d74c821dbd86ec76d407733952cca394d1ecd..9bfade71b8908f94f82ae8200e133d7132331177 100644
--- a/lib/compiler/implementation/scanner/listener.dart
+++ b/lib/compiler/implementation/scanner/listener.dart
@@ -1527,6 +1527,14 @@ class PartialFieldListElement extends VariableListElement {
     cachedNode = parse(listener,
                        getCompilationUnit(),
                        (p) => p.parseVariablesDeclaration(beginToken));
+    if (!cachedNode.modifiers.isVar() &&
+        !cachedNode.modifiers.isFinal() &&
+        !cachedNode.modifiers.isConst() &&
+        cachedNode.type === null) {
+      listener.cancel('A field declaration must start with var, final, '
+                      'const, or a type annotation.',
+                      cachedNode);
+    }
     return cachedNode;
   }