FILE: typeOperators.kt
    public final? interface IThing : R|kotlin/Any| {
    }
    public? final? fun test1(x: Any): <implicit> {
        ^test1 (x# is IThing)
    }
    public? final? fun test2(x: Any): <implicit> {
        ^test2 (x# !is IThing)
    }
    public? final? fun test3(x: Any): <implicit> {
        ^test3 (x# as IThing)
    }
    public? final? fun test4(x: Any): <implicit> {
        ^test4 (x# as? IThing)
    }
