Compiler Error: Cannot find type 'CodingKeys' in scope

[garricn]

Description

Compiler Error: Cannot find type 'CodingKeys' in scope when CodingKeys is used as a parameter in a static or instance method in the main type definition of an Enum.

Steps To Reproduce

1. Xcode 14.1 playground
2. This code does NOT compile:

enum SomeCodableEnum: Codable {
    case someCase
    // Compiler Error: "Cannot find type 'CodingKeys' in scope"
    private static func print0(_ codingKeys: CodingKeys.Type) {}
    // Compiler Error: "Cannot find type 'CodingKeys' in scope"
    private func print1(_ codingKeys: CodingKeys.Type) {}
}

3. This code DOES compile:

enum SomeCodableEnum: Codable {
    case someCase
    static func print0() {
        print(CodingKeys.self)
    }
    func print1() {
        print(CodingKeys.self)
    }
}

extension SomeCodableEnum {
    private static func print2(_ codingKeys: CodingKeys.Type) {
        print(codingKeys)
    }
    private func print3(_ codingKeys: CodingKeys.Type) {
        print(codingKeys)
    }
}

...

Expected behavior
Code should compile when CodingKeys is used as a parameter in the definition of a static or instance method in the main type definition of an Enum.

Environment (please fill out the following information)

• OS: macOS 12.6.1 (21G217)
• Xcode Version/Tag/Branch: Xcode 14.1 (14B47B)

Additional context
It appears that structs and classes do not have this issue.

[tinder-garricnahapetian]

Another interesting finding:

This DOES compiles:

enum SomeCodableEnum: Codable {
    case someCase
    private var someProperty: Self.CodingKeys.Type? { nil }
    private static func framework(fromKeyedContainer container: CodingKeys) {}
}

This does NOT compile:

enum SomeCodableEnum: Codable {
    case someCase
    private static func framework(fromKeyedContainer container: CodingKeys) {}
}