| library /*isNonNullableByDefault*/; | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | class A extends core::Object { | 
 |   synthetic constructor •() → self::A | 
 |     ; | 
 |   method m(core::num n) → void | 
 |     ; | 
 | } | 
 | class B extends self::A { | 
 |   synthetic constructor •() → self::B | 
 |     ; | 
 |   forwarding-stub forwarding-semi-stub method /* signature-type: (core::int) → void */ m(covariant-by-declaration core::num i) → void | 
 |     return super.{self::A::m}(i); | 
 | } | 
 | class C extends self::B { | 
 |   synthetic constructor •() → self::C | 
 |     ; | 
 |   method m(covariant-by-declaration core::int i) → void | 
 |     ; | 
 | } | 
 | static method main() → dynamic | 
 |   ; | 
 | static method throws(() → void f) → dynamic | 
 |   ; |