Hi Robert,
When the conditional conformance feature arrives in Swift, it will allow
us to express `extension Array : Encodable where Element : Encodable`
and `extension Array : Decodable where Element : Decodable`.
At the moment, this isn’t possible, so `Array` is unconditionally
`Codable` and the failure happens at runtime. This will be a
compile-time error in a future version of Swift.
— Itai
On 26 Oct 2017, at 9:47, Robert Nikander via swift-users wrote:
Hi,
This error makes perfect sense, but I’m surprised it's a runtime
error. I expected it at compile time. Am I doing something wrong? Is
this on the type system to-do list?
let c = JSONEncoder()
struct Foo { … }
let fs: [Foo] = [ Foo(...) ]
let data = try! c.encode(fs) // Didn’t think this would compile
The runtime error is: fatal error: Array<Foo> does not conform to
Encodable because Foo does not conform to Encodable.
Rob_______________________________________________
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