library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A<X extends core::num> extends core::Object {
  synthetic constructor •() → self::A<self::A::X>
    ;
  method f<covariant-by-class Y extends self::A::X>(self::A::f::Y y) → void
    ;
}
static method expectThrows(() → void f) → dynamic
  ;
static method main() → dynamic
  ;