Fix buffer overrun (issue #678). Add assert for detecting this kind of issues earlier.
void yr_re_print(
    RE_AST* re_ast)
{
  _yr_re_print_node(re_ast->root_node);
}

void yr_re_print(
    RE_AST* re_ast)
{
  _yr_re_print_node(re_ast->root_node);
}
