// -*- js -*-

def assert(x, msg)
{
  if (!x)
  {
    print("ERROR: assert failed: " + msg);
    assert_failure(); // indirect throw
  }
}

var args = args_parser();
args.bool_opt("fail", "fail the program immediately", "false");

if(args.parse().fail) {
    exit(-42);
}

var b = buffer();
b.paste("hello this is some text");
b.set_mark();
b.rfind("some");
var t = b.copy();

assert(t + "." == "some text.", "concat text+string");
assert(".some text" == "." + t, "concat string+text");
assert(t + ".some text" == t + "." + t, "concat text+text");
assert((t == ".") == false, "eq compare should fail");
assert(("." == t) == false, "eq compare should fail");
assert(t.at(0) == "s", "at on text");