@interface BaseClass : NSObject
- (void)method;
@end

@interface Subclass<T> : BaseClass
- (void)method;
@end

let subclass: Subclass<NSNumber> = Subclass()
subclass.method()

Ambiguous.swift:: error: ambiguous use of 'method()'
    subclass.method()
    ^
__ObjC.Subclass:3:15: note: found this candidate
    open func method()
              ^
__ObjC.BaseClass:3:15: note: found this candidate
    open func method()
              ^

open class BaseClass : NSObject {

    
    open func method()
}

open class Subclass<T : AnyObject> : BaseClass {

    
    open func method()
}

open class BaseClass : NSObject {
    open func method() {}
}

open class Subclass<T : AnyObject> : BaseClass {
    open override func method() {}
}

let subclass: Subclass<NSNumber> = Subclass()
subclass.method()