library /*isNonNullableByDefault*/;
//
// Problems in library:
//
// pkg/front_end/testcases/nnbd/issue43716a.dart:15:14: Error: A value of type 'Object?' can't be returned from a function with return type 'Object' because 'Object?' is nullable and 'Object' isn't.
//  - 'Object' is from 'dart:core'.
//     return z.x; // Error.
//              ^
//
import self as self;
import "dart:core" as core;

class C<X extends self::C<self::C::X%, self::C::X%>? = self::C<dynamic, dynamic>?, Y extends self::C<self::C::Y%, self::C::Y%>? = self::C<dynamic, dynamic>?> extends core::Object {
  generic-covariant-impl field self::C::X% x;
  constructor •(self::C::X% x) → self::C<self::C::X%, self::C::Y%>
    : self::C::x = x, super core::Object::•()
    ;
  method m(generic-covariant-impl self::C::X% x, generic-covariant-impl self::C::Y% y) → core::Object {
    self::C<core::Object?, core::Object?>? z = self::b ?{self::C<core::Object?, core::Object?>?} x : y;
    if(z.{core::Object::==}(null))
      throw 0;
    return let final<BottomType> #t1 = invalid-expression "pkg/front_end/testcases/nnbd/issue43716a.dart:15:14: Error: A value of type 'Object?' can't be returned from a function with return type 'Object' because 'Object?' is nullable and 'Object' isn't.
 - 'Object' is from 'dart:core'.
    return z.x; // Error.
             ^" in z{self::C<core::Object?, core::Object?>}.{self::C::x} as{TypeError,ForNonNullableByDefault} core::Object;
  }
}
static field core::bool b = true;
static method main() → dynamic {}