def p_include_once_fname(p):
    """ include_once : INCLUDE ONCE FILENAME
    """
    p[0] = []

    if ENABLED:
        p[0] = include_once(p[3], p.lineno(3), local_first=False)
    else:
        p[0] = []

    if not p[0]:
        p.lexer.next_token = '_ENDFILE_'