Protocol Type in State of Reducer

[byunsangun]

public struct TestProtocol {
    var temp: String { get }
}

struct TestReducer: Reducer {
    struct State: Equatable {
        var temp: TestProtocol
    }
}

I'm trying to create a field within a State inside a Reducer,
and I want to declare the type of this field as a protocol.

However, I'm encountering the following error:

"Type 'TestReducer.State' does not conform to protocol 'Equatable'".

I'm curious about why this error is occurring and how to resolve it.

Thank you in advance.

[mbrandonw]

Hi @byunsangun, this is not a TCA problem. It's just how Swift works. Existentials like any TestProtocol do not conform to Equatable even if TestProtocol: Equatable. You just can't use protocols like this if you want your state to be equatable.