|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/regress/issue_31183.dart:6:12: Error: Unexpected token 'unary'. | 
|  | //   operator unary- => 0; | 
|  | //            ^^^^^ | 
|  | // | 
|  | // pkg/front_end/testcases/regress/issue_31183.dart:6:17: Error: A method declaration needs an explicit list of parameters. | 
|  | // Try adding a parameter list to the method declaration. | 
|  | //   operator unary- => 0; | 
|  | //                 ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | class C extends core::Object { | 
|  | synthetic constructor •() → self::C | 
|  | : super core::Object::•() | 
|  | ; | 
|  | operator unary-() → dynamic | 
|  | return 0; | 
|  | } | 
|  | static method main() → dynamic { | 
|  | new self::C::•(); | 
|  | } |