Fix bug 1011

frog/gen.dart

Index: frog/gen.dart
diff --git a/frog/gen.dart b/frog/gen.dart
index eb0e8f582887b493ea9baf6a59cb4567ba8ca694..b0d59ba828d9838dc73126fc225cffe76fcb0703 100644
--- a/frog/gen.dart
+++ b/frog/gen.dart
@@ -557,7 +557,7 @@ function $inheritsMembers(child, parent) {
     writer.comment('// ${typesWithDynamicDispatch.length} dynamic types.');
 
     typeTag(type) => type.definition.nativeType.name;
-    
+
     // Build a pre-order traversal over all the types and their subtypes.
     var seen = new Set();
     var types = [];
@@ -2260,6 +2260,10 @@ class MethodGenerator implements TreeVisitor {
     }
   }
 
+  visitDeclaredIdentifier(DeclaredIdentifier node) {
+    world.error('Expected expression', node.span);
+  }
+
   visitAwaitExpression(AwaitExpression node) {
     world.internalError(
         'Await expressions should have been eliminated before code generation',