|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/enhanced_enums/external_constructor.dart:9:25: Error: An external constructor can't initialize fields. | 
|  | // Try removing the field initializers, or removing the keyword 'external'. | 
|  | //   external const E(this.x); | 
|  | //                         ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | class E extends core::_Enum /*isEnum*/  { | 
|  | enum-element static const field self::E a = const self::E::•(0, "a", 1); | 
|  | final field core::int x; | 
|  | static const field core::List<self::E> values = const <self::E>[self::E::a]; | 
|  | external const constructor •(core::int #index, core::String #name, core::int x) → self::E | 
|  | : final dynamic #t1 = invalid-expression "pkg/front_end/testcases/enhanced_enums/external_constructor.dart:9:25: Error: An external constructor can't initialize fields. | 
|  | Try removing the field initializers, or removing the keyword 'external'. | 
|  | external const E(this.x); | 
|  | ^"; | 
|  | method core::_enumToString() → core::String | 
|  | return "E.${this.{core::_Enum::_name}{core::String}}"; | 
|  | } |