I ran the following code in both kotlinc and ki (github)

data class Person(val name: String, val roles: List<String>)

val m = Person("bob", mutableListOf("developer"))
m.roles.addFirst("a")

In kotlinc, I got an error message:

 > kotlinc -script Immutable.kts 
Immutable.kts:4:9: error: unresolved reference 'addFirst'.
m.roles.addFirst("a")
        ^

However, ki allowed me to modify the mutable list roles:

> ki
ki-shell 0.5.2/1.7.0
type :h for help
[0] data class Person(val name: String, val roles: List<String>)
[1] val m = Person("bob", mutableListOf("developer"))
[2] m.roles.addFirst("a")
[3] m.roles
res3: List<String> = [a, developer]

So, why the code returns two different outcomes depending on how it was executed?