If you run the test_load function to check if a file can load or not, on a file that is already loaded, then it crashes.
It can be tested on Lil/testsuite by doing eval return test_load(base_name(this_object()));

For now, it can be avoided with a simul_efun like this:

int test_load(string filename){
  if(filename && find_object(filename)) error("test_load called on already loaded "+filename);
  return efun::test_load(filename);
}