/*
 *  call-seq:
 *     explanation.to_s -> string
 *
 *  Returns a string representation of the explanation in readable format.
 */
static VALUE
frt_expl_to_s(VALUE self)
{
    GET_EXPL();
    char *str = expl_to_s(expl);
    VALUE rstr = rb_str_new2(str);
    free(str);
    return rstr;
}