Cannot use CodingKey named "value"

[Marc Prud'hommeaux]

The following swift:

public struct ValueHolder: Decodable {
    public let x: Int
    public let value: String?
    public let z: Bool
}

transpiles into the kotlin:

class ValueHolder: Decodable {
    val x: Int
    val value: String?
    val z: Boolean

    constructor(x: Int, value: String? = null, z: Boolean) {
        this.x = x
        this.value = value
        this.z = z
    }

    private enum class CodingKeys(override val rawValue: String, @Suppress("UNUSED_PARAMETER") unusedp: Nothing? = null): CodingKey, RawRepresentable<String> {
        x("x"),
        value("value"),
        z("z");
    }

    private fun CodingKeys(rawValue: String): CodingKeys? {
        return when (rawValue) {
            "x" -> CodingKeys.x
            "value" -> CodingKeys.value
            "z" -> CodingKeys.z
            else -> null
        }
    }

    constructor(from: Decoder) {
        val container = from.container(keyedBy = CodingKeys::class)
        this.x = container.decode(Int::class, forKey = CodingKeys.x)
        this.value = container.decodeIfPresent(String::class, forKey = CodingKeys.value)
        this.z = container.decode(Boolean::class, forKey = CodingKeys.z)
    }

    companion object: DecodableCompanion<ValueHolder> {
        override fun init(from: Decoder): ValueHolder = ValueHolder(from = from)
    }
}

and yields the (rather inscrutable) compile error:

GRADLE> e: file://…Tests.kt:270:16 Expecting ';' after the last enum entry or '}' to close enum class body
GRADLE> e: file://…Tests.kt:271:14 Expecting member declaration
GRADLE> e: file://…Tests.kt:271:15 Expecting member declaration
GRADLE> e: file://…Tests.kt:271:16 Expecting member declaration
GRADLE> e: file://…Tests.kt:271:21 Expecting member declaration
GRADLE> e: file://…Tests.kt:271:22 Expecting member declaration
GRADLE> e: file://…Tests.kt:271:23 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:9 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:10 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:11 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:12 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:13 Expecting member declaration
GRADLE> e: file://…Tests.kt:272:14 Expecting member declaration
GRADLE> e: file://…Tests.kt:278:35 Unresolved reference: value
GRADLE> e: file://…Tests.kt:279:31 Unresolved reference: z
GRADLE> e: file://…Tests.kt:287:83 Unresolved reference: value
GRADLE> e: file://…Tests.kt:288:71 Unresolved reference: z
GRADLE> 
GRADLE> FAILURE: Build failed with an exception.

The workaround is to rename the value property to something else and assign the corresponding CodingKey to the name back to "value", like so:

public struct ValueHolder: Decodable {
    public let x: Int
    private let _value: String?
    public var value: String? { _value }
    public let z: Bool


    public enum CodingKeys : String, CodingKey {
        case x
        case _value = "value"
        case z
    }
}