== test ==
fun test(s: IntProgression?) {
    s?.first
}
---------------------
               <v0>: {<: IntProgression?}   NEW: magic[FAKE_INITIALIZER](s: IntProgression?) -> <v0>
s              <v1>: {<: IntProgression?}   NEW: r(s) -> <v1>
first          <v2>: *                      NEW: r(first|<v1>) -> <v2>
s?.first       <v2>: *                      COPY
{ s?.first }   <v2>: *                      COPY
=====================