|  | library test; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/inference_new/strongly_connected_component.dart:17:5: Error: Can't infer the type of 'x': circularity found during type inference. | 
|  | // Specify the type explicitly. | 
|  | // var x = /*@returnType=() -> invalid-type*/ () => f() ? y : z; | 
|  | //     ^ | 
|  | // | 
|  | // pkg/front_end/testcases/inference_new/strongly_connected_component.dart:8:13: Error: The value 'null' can't be returned from a function with return type 'bool' because 'bool' is not nullable. | 
|  | // bool f() => null; | 
|  | //             ^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | static field invalid-type x = () → () → invalid-type => self::f() ?{() → invalid-type} self::y : self::z; | 
|  | static field () → invalid-type y = () → invalid-type => self::x; | 
|  | static field () → invalid-type z = () → invalid-type => self::x; | 
|  | static method f() → core::bool | 
|  | return invalid-expression "pkg/front_end/testcases/inference_new/strongly_connected_component.dart:8:13: Error: The value 'null' can't be returned from a function with return type 'bool' because 'bool' is not nullable. | 
|  | bool f() => null; | 
|  | ^" in null as{TypeError} core::bool; | 
|  | static method main() → dynamic {} |