Decodable warning unexpectedly silenced by CodingKeys presence

Using Swift
4

it seems if you declare the Codable conformance via an extension you'll still get the warnings:

struct Test {
    var foo = 1
    let bar = 2 // ⚠️
}

extension Test: Codable {}

i haven't thought about it enough to have an opinion on whether the diagnostic makes sense to always emit, but it is a bit surprising that the behavior isn't consistent.

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