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