== invoke ==
fun invoke(f: () -> Unit) {
    (f)()
}
---------------------
L0:
  1 <START>
    v(f: () -> Unit)
    magic[FAKE_INITIALIZER](f: () -> Unit) -> <v0>
    w(f|<v0>)
  2 mark({ (f)() })
    mark((f))
    r(f) -> <v1>
    mark((f)())
    call((f)(), invoke|<v1>) -> <v2>
L1:
  1 <END>                                             NEXT:[<SINK>]
error:
    <ERROR>                                           PREV:[]
sink:
    <SINK>                                            PREV:[<ERROR>, <END>]
=====================