[swift-evolution] [Pitch] separate syntax of class inheritance and protocol conformance

[Georgios Moschovitis]

> The current syntax establishes a relationship.
> 
> X: Y
> 
> means "X will have interface of Y". Note there's no mention of inheritance or protocol here: they both establish this relationship. This is why we can use
> 
> z is Y
> 
> To check whether such relationship holds. Again, there's no need to worry whether Y is a class or protocol.

Totally agree. You shouldn’t care if Y is a class or protocol. You might even want to convert a protocol to a class down the road.

The current syntax is great, no need for changes.