/* Ensure there are no bizarre difficulties with accessing the 'isa' field of objects.  *//* { dg-do compile } */#include <objc/Object.h>@interface Object (Test)- (Class) test1: (id)object;@end@interface Derived: Object- (Class) test2: (id)object;@end@implementation Object (Test)Class test1(id object) {  Class cls = object->isa;  return cls;}- (Class) test1: (id)object {  Class cls = object->isa;  return cls;}@end@implementation DerivedClass test2(id object) {  Class cls = object->isa;  return cls;}- (Class) test2: (id)object {  Class cls = object->isa;  return cls;}@endClass test3(id object) {  Class cls = object->isa;  return cls;}