Various errors on constant expressions.

pkg/front_end/lib/src/fasta/builder/builder.dart

Index: pkg/front_end/lib/src/fasta/builder/builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/builder.dart b/pkg/front_end/lib/src/fasta/builder/builder.dart
index 02df166cb1ec6a2ca6ac37bdc606a145da874e57..1ac63cf5ad2111dfa2a1705e8a1916720fdddf83 100644
--- a/pkg/front_end/lib/src/fasta/builder/builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/builder.dart
@@ -162,12 +162,16 @@ abstract class Builder {
 
   bool get isTypeDeclaration => false;
 
+  bool get isTypeVariable => false;
+
   bool get isConstructor => false;
 
   bool get isFactory => false;
 
   bool get isLocal => false;
 
+  bool get isConst => false;
+
   get target => internalError("Unsupported operation $runtimeType.");
 
   bool get hasProblem => false;