== t1 ==
fun t1() {
    for (i in 1..2) {
        doSmth(i)
    }
}
---------------------
L0:
    <START>
    mark({ for (i in 1..2) { doSmth(i) } })
    mark(for (i in 1..2) { doSmth(i) })
    mark(1..2)
    r(1)
    r(2)
    call(.., rangeTo)
    v(i)
    w(i)
L3:
    jmp?(L2)                                   NEXT:[read (Unit), mark({ doSmth(i) })]
L4 [loop entry point]:
L5 [body entry point]:
    mark({ doSmth(i) })                        PREV:[jmp?(L2), jmp?(L4 [loop entry point])]
    mark(doSmth(i))
    r(i)
    call(doSmth, doSmth)
    jmp?(L4 [loop entry point])                NEXT:[mark({ doSmth(i) }), read (Unit)]
L2:
    read (Unit)                                PREV:[jmp?(L2), jmp?(L4 [loop entry point])]
L1:
    <END>                                      NEXT:[<SINK>]
error:
    <ERROR>                                    PREV:[]
sink:
    <SINK>                                     PREV:[<ERROR>, <END>]
=====================
== doSmth ==
fun doSmth(i: Int) {}
---------------------
L0:
    <START>
    v(i: Int)
    w(i)
    mark({})
    read (Unit)
L1:
    <END>          NEXT:[<SINK>]
error:
    <ERROR>        PREV:[]
sink:
    <SINK>         PREV:[<ERROR>, <END>]
=====================