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

class C<X extends (self::C::X%) →? void = (Never) →? void> extends core::Object {
  generic-covariant-impl field self::C::X% x;
  constructor •(self::C::X% x) → self::C<self::C::X%>
    ;
  method m() → void
    ;
}
static field core::bool b;
static method f(core::Object o) → void
  ;
static method main() → dynamic
  ;