Swift: check if generic type conforms to protocol

I have to say @Alex want to check if T type conforms to protocol rather than s. And some answerer didn’t see clearly.

Check T type conforms to protocol like this :

if let _ = T.self as? MyProtocol.Type {
    //  T conform MyProtocol
}

or

if T.self is MyProtocol.Type {
    //  T conform MyProtocol
}