== Bar ==
abstract class Bar {
    abstract var bar : String
    fun foo() = "foo" + this.$bar
}
---------------------
=====================
== foo ==
fun foo() = "foo" + this.$bar
---------------------
"foo"               <v0>: String      NEW: r("foo") -> <v0>                
this                <v1>: {<: Bar}    COPY                                 
this                <v1>: {<: Bar}    NEW: r(this) -> <v1>                 
$bar                <v2>: {<: Any?}   NEW: r($bar|<v1>) -> <v2>            
this.$bar           <v2>: {<: Any?}   COPY                                 
"foo" + this.$bar   <v3>: String      NEW: call(+, plus|<v0>, <v2>) -> <v3>
=====================