/*
 *  call-seq:
 *     dir.rename(from, to) -> self
 *
 *  Rename a file from +from+ to +to+. An error will be raised if the file
 *  doesn't exist or there is some other type of IOError.
 */
static VALUE
frt_dir_rename(VALUE self, VALUE rfrom, VALUE rto)
{
    Store *store = DATA_PTR(self);
    StringValue(rfrom);
    StringValue(rto);
    store->rename(store, rs2s(rfrom), rs2s(rto));
    return self;
}