== main ==
fun main() {
    while(0 > 1) {
      2
    }
}
---------------------
0       <v0>   NEW()          
>       <v2>   NEW(<v0>, <v1>)
1       <v1>   NEW()          
0 > 1   <v2>   COPY           
2       <v3>   NEW()          
{ 2 }   <v3>   COPY           
=====================
== dowhile ==
fun dowhile() {
    do {return}
    while(0 > 1)
}
---------------------
0       <v0>   NEW()          
>       <v2>   NEW(<v0>, <v1>)
1       <v1>   NEW()          
0 > 1   <v2>   COPY           
=====================