| library; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/class_modifiers/invalid_abstract_modifier_combinations.dart:5:10: Error: An 'abstract' class can't be declared as both 'final' and 'base'. | 
 | // Try removing either the 'final' or 'base' keyword. | 
 | // abstract final base class FinalBase {} | 
 | //          ^^^^^^^^^^ | 
 | // | 
 | // pkg/front_end/testcases/class_modifiers/invalid_abstract_modifier_combinations.dart:6:10: Error: An 'abstract' class can't be declared as both 'final' and 'interface'. | 
 | // Try removing either the 'final' or 'interface' keyword. | 
 | // abstract final interface class FinalInterface {} | 
 | //          ^^^^^^^^^^^^^^^ | 
 | // | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | abstract base final class FinalBase extends core::Object { | 
 |   synthetic constructor •() → self::FinalBase | 
 |     ; | 
 | } | 
 | abstract interface final class FinalInterface extends core::Object { | 
 |   synthetic constructor •() → self::FinalInterface | 
 |     ; | 
 | } |