== foo ==
fun foo() {
    var i = 1
    i++
}
---------------------
L0:
  1 <START>
  2 mark({ var i = 1 i++ })
    v(var i = 1)
    r(1) -> <v0>
    w(i|<v0>)
    r(i) -> <v1>
    mark(i++)
    call(i++, inc|<v1>) -> <v2>
    w(i|<v2>)
L1:
  1 <END>                          NEXT:[<SINK>]
error:
    <ERROR>                        PREV:[]
sink:
    <SINK>                         PREV:[<ERROR>, <END>]
=====================