Function main

test/browser/async_virtual.cpp:26–36

BatchFile *bf = &b;

int main(void) {
  printf("main.\n");
  int cnt = 0;
  int result = 0;
  while (cnt < 5) {
    printf("main loop %i\n", ++cnt);
    result += bf->ReadLine(0);
  }
  assert(result == 5);
  return 0;
}