// Issue #635: async + optimized for loop must not segfault from dangling pointer
// := is reference-assign, so ret aliases i and sees the loop exit value

var func = fun(){
  var ret = 0;
  for (var i = 0; i < 1000; ++i) {
    ret := i;
  }
  return ret;
}

var&fut1 = async(func);
var fut2 = async(func);

assert_equal(1000, fut1.get())
assert_equal(1000, fut2.get())

// Multiple concurrent async calls to stress the scenario
var results = []
for (var n = 0; n < 5; ++n) {
  results.push_back(async(func))
}
for (var n = 0; n < 5; ++n) {
  assert_equal(1000, results[n].get())
}