// Expectation for test: 
// // Method to test: function(test)
// import 'package:expect/expect.dart';
// 
// // This example illustrates a case we wish to do better in terms of inlining and
// // code generation.
// //
// // Naively this function would be compiled without inlining Wrapper.[],
// // JSArray.[] and Wrapper.[]= because:
// // JSArray.[] is too big (14 nodes)
// // Wrapper.[] is too big if we force inlining of JSArray (15 nodes)
// // Wrapper.[]= is even bigger (46 nodes)
// //
// // We now do specialization of [] and []= by adding guards and injecting builtin
// // operators. This made it possible to inline []. We still don't see []= inlined
// // yet, that might require that we improve the inlining counting heuristics a
// // bit.
// @NoInline()
// test(data, x) {
//   data[x + 1] = data[x];
// }
// 
// main() {
//   var wrapper = new Wrapper();
//   wrapper[33] = wrapper[1]; // make Wrapper.[]= and [] used more than once.
//   print(test(new Wrapper(), int.parse('2')));
// }
// 
// class Wrapper {
//   final List arr = <bool>[true, false, false, true];
//   operator[](int i) => this.arr[i];
//   operator[]=(int i, v) {
//     if (i > arr.length - 1) arr.length = i + 1;
//     return arr[i] = v;
//   }
// }

function(data, x) {
  var v0 = J.$add$ns(x, 1), v1 = data.arr;
  if (x >>> 0 !== x || x >= v1.length)
    return H.ioore(v1, x);
  data.$indexSet(0, v0, v1[x]);
}