Kotlin happily infers Any for you

any.kt

data class Wrapper(val id: String)
val ids = listOf("id1", "id2")
listOf(
    Wrapper("id1").id,
    Wrapper("id2")
).forEach { someId -> // inferred as Any
    val result = ids.find { it == someId }
    // id2 will never be found, but the compiler won't tell you
}