|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/regress/invalid_this_reference_05.dart:8:4: Error: Not a constant expression. | 
|  | //   @x2 | 
|  | //    ^^ | 
|  | // | 
|  | // pkg/front_end/testcases/regress/invalid_this_reference_05.dart:8:4: Error: This can't be used as an annotation; an annotation should be a reference to a compile-time constant variable, or a call to a constant constructor. | 
|  | //   @x2 | 
|  | //    ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | class Foo extends core::Object { | 
|  | field core::int x2 = 42; | 
|  | @invalid-expression "pkg/front_end/testcases/regress/invalid_this_reference_05.dart:8:4: Error: This can't be used as an annotation; an annotation should be a reference to a compile-time constant variable, or a call to a constant constructor. | 
|  | @x2 | 
|  | ^" | 
|  | field core::int? a = null; | 
|  | @invalid-expression "pkg/front_end/testcases/regress/invalid_this_reference_05.dart:8:4: Error: This can't be used as an annotation; an annotation should be a reference to a compile-time constant variable, or a call to a constant constructor. | 
|  | @x2 | 
|  | ^" | 
|  | field core::int? b = null; | 
|  | synthetic constructor •() → self::Foo | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } |