text: var x = [1,2,3];
  
  var __result1 = x.shift();
  var __expect1 = 1;
  
  var __result2 = x.toString();
  var __expect2 = "2,3";
  
  var __result3 = x.length;
  var __expect3 = 2
  
  var __result4 = x.shift();
  var __expect4 = 2
  
  var __result5 = x.length;
  var __expect5 = 1
  
  var __result6 = x.shift();
  var __expect6 = 3
  
  var __result7 = x.length;
  var __expect7 = 0
  
  var __result8 = x.shift();
  var __expect8 = undefined
  
  var __result9 = x.length;
  var __expect9 = 0
  