== main ==
fun main(arg : Array<String>) {
    a
}
---------------------
L0:
    <START>
    v(arg : Array<String>)
    w(arg)
    mark({ a })
    error(a, No resolved call)
L1:
    <END>                         NEXT:[<SINK>]
error:
    <ERROR>                       PREV:[]
sink:
    <SINK>                        PREV:[<ERROR>, <END>]
=====================