gistfile1.m

@interface Class0 @end
@interface Class1 @end

@interface Class2 {}
+ (id)test:(Class0 *)class;
- (id)test:(Class0 *)class;
@end

@interface Class3 {}
+ (id)test:(Class1 *)class;
- (id)test:(Class1 *)class;
@end

int main (void) {
    Class0 *class0 = 0x0;
    Class1 *class1 = 0x0;
    Class2 *class2 = [[Class2 test:class0] test:class0];
    Class3 *class3 = [[Class3 test:class1] test:class1];
    Class2 *class4 = [[Class2 test:class1] test:class1];
    Class3 *class5 = [[Class3 test:class0] test:class0];
    return 0;
}