https://github.com/akkartik/mu/blob/master/apps/raytracing/1.mu
 1 fn main -> exit-status/ebx: int {
 2   print-string 0, "P3\n256 256\n255\n"
 3   var j/ecx: int <- copy 0xff
 4   {
 5     compare j, 0
 6     break-if-<
 7     var i/eax: int <- copy 0
 8     {
 9       compare i, 0xff
10       break-if->
11       print-int32-decimal 0, i
12       print-string 0, " "
13       print-int32-decimal 0, j
14       print-string 0, " 64\n"
15       i <- increment
16       loop
17     }
18     j <- decrement
19     loop
20   }
21   exit-status <- copy 1
22 }