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kotlinlang

Given this enum class:
```    enum class Trait(code: String) {
        AMBITIOUS("ambitious"),
        HUNTER_1("hunter_1"),
        WRATHFUL("wrathful"),
        CALLOUS("callous"),
        VIKING("viking"),
        EDUCATION_MARTIAL_3("education_martial_3")
    }```
I want to access the `code` property as described in this tutorial: <https://www.baeldung.com/kotlin-enum>
Having this statement
```val code = Trait.EDUCATION_MARTIAL_3.code
                                    ^^^^^```
Where `code` `Unresolved reference: code`
Was the feature removed from the latest Kotlin version or what happened?

`val` is missing:
```enum class Trait(val code: String) {
...
}```