== foo ==
fun foo() {
    "before"
    while (true) {
        val a: Int
    }
    "after"
}
---------------------
L0:
  1 <START>                                                   INIT: in: {} out: {}
  2 mark({ "before" while (true) { val a: Int } "after" })
    mark("before")
    r("before") -> <v0>
L2 [loop entry point]:
L5 [condition entry point]:
    r(true) -> <v1>
    mark(while (true) { val a: Int })
    magic[VALUE_CONSUMER](true|<v1>) -> <v2>
L4 [body entry point]:
  3 mark({ val a: Int })
    v(val a: Int)                                             INIT: in: {} out: {a=D}
  2 jmp(L2 [loop entry point])                                INIT: in: {} out: {}       USE: in: {} out: {}
L3 [loop exit point]:
-   read (Unit)
-   mark("after")
-   r("after") -> <v3>
L1:
  1 <END>                                                     INIT: in: {} out: {}
error:
    <ERROR>
sink:
    <SINK>                                                                               USE: in: {} out: {}
=====================