process main {
    buffer() buf;
    buf->append("12");
    buf->append("345");
    buf->append("6");
    num_equal(buf, "123456") a;
    assert(a);
    
    var("false") check;
    call("test_func", {});
    assert(check);
    
    buffer() buf;
    buf->append("test_func");
    var("false") check;
    call(buf, {});
    assert(check);
    
    concat("test_func") cnc;
    var("false") check;
    call(cnc, {});
    assert(check);
    
    buffer() buf;
    buf->append("test_func");
    var("false") check;
    process_manager() mgr;
    mgr->start(buf, {});
    assert(check);
    
    buffer() buf;
    buf->append("/bin/echo");
    runonce({buf, buf});
    
    buffer() buf;
    buf->append("12");
    buf->append("345");
    to_string(buf) str;
    val_equal(str, "\"12345\"") a;
    assert(a);
    
    exit("0");
}

template test_func {
    _caller.check->set("true");
}