i have a protocol and generics problem

It sounds like you are dealing with a problem involving protocols and generics in Swift. Here are some relevant insights from the WWDC sessions that might help you:

Noncopyable Generics:
- In the session Consume noncopyable types in Swift, it is explained how to handle noncopyable generics. The session discusses removing the copyable constraint from a protocol to allow noncopyable types to conform to it. This can be particularly useful if you want to use types like BankTransfer generically without requiring them to be copyable.
Generics in Embedded Swift:
- The session Go small with Embedded Swift mentions that generics are fully supported in Embedded Swift. This includes the ability to replace Any types with generics to avoid runtime overhead and improve performance.
Protocols and Generics:
- In A Swift Tour: Explore Swift’s features and design, there is an example of extending a collection with a method that uses generics and protocol constraints. This can help you understand how to apply generics to collections and other types that conform to protocols.
Swift Performance and Generics:
- The session Explore Swift performance discusses how generics and protocol constraints are handled at runtime, including the use of function pointer tables for protocol requirements. This can provide insights into the performance implications of using generics and protocols.
Migrating to Swift 6:
- In Migrate your app to Swift 6, there is a discussion on protocol requirements and how they interact with concurrency features in Swift 6. This might be useful if your problem involves concurrency and protocol conformance.

If you need more specific details or have a particular aspect of your problem you'd like to dive deeper into, feel free to ask!