== foo ==
fun foo() {
    {}
}
---------------------
L0:
  1 <START>
  2 mark({ {} })
    mark({})
    jmp?(L2)         NEXT:[r({}) -> <v0>, d({})]
    d({})            NEXT:[<SINK>]
L2 [after local declaration]:
    r({}) -> <v0>    PREV:[jmp?(L2)]
L1:
  1 <END>            NEXT:[<SINK>]
error:
    <ERROR>          PREV:[]
sink:
    <SINK>           PREV:[<ERROR>, <END>, d({})]
=====================
== anonymous_0 ==
{}
---------------------
L3:
  3 <START>
  4 mark()
    read (Unit)
L4:
  3 <END>          NEXT:[<SINK>]
error:
    <ERROR>        PREV:[]
sink:
    <SINK>         PREV:[<ERROR>, <END>]
=====================