| Index: pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
 | 
| diff --git a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
 | 
| index 454ee91dff1e2e859ce61f33e573ddeb0175694d..0375bc32d8cb514f93a49f78dc9b3a100181d7df 100644
 | 
| --- a/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
 | 
| +++ b/pkg/compiler/lib/src/dart_backend/backend_ast_to_frontend_ast.dart
 | 
| @@ -1213,7 +1213,6 @@ class TreePrinter {
 | 
|      }
 | 
|  
 | 
|      if (supertype != null) {
 | 
| -      tree.Node superclass;
 | 
|        if (supertype.element.isUnnamedMixinApplication) {
 | 
|          while (supertype.element.isUnnamedMixinApplication) {
 | 
|            elements.MixinApplicationElement mixinApplication = supertype.element;
 | 
| 
 |