File: struct_codable_simple_extension.swift

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// RUN: %target-typecheck-verify-swift -verify-ignore-unknown -swift-version 4

// Simple structs where Codable conformance is added in extensions should derive
// conformance.
struct SimpleStruct {
  var x: Int
  var y: Double
  static var z: String = "foo"
  func foo() {
    // They should receive a synthesized CodingKeys enum.
    let _ = SimpleStruct.CodingKeys.self

    // The enum should have a case for each of the vars.
    let _ = SimpleStruct.CodingKeys.x
    let _ = SimpleStruct.CodingKeys.y

    // Static vars should not be part of the CodingKeys enum.
    let _ = SimpleStruct.CodingKeys.z // expected-error {{type 'SimpleStruct.CodingKeys' has no member 'z'}}
  }
}

extension SimpleStruct : Codable {
}

// They should receive synthesized init(from:) and an encode(to:).
let _ = SimpleStruct.init(from:)
let _ = SimpleStruct.encode(to:)

// The synthesized CodingKeys type should not be accessible from outside the
// struct.
let _ = SimpleStruct.CodingKeys.self // expected-error {{'CodingKeys' is inaccessible due to 'private' protection level}}