impl<E: Borrow<Env>, T> MutTxn<E, T> {
  /// Borrow env
  pub fn env_borrow(&self) -> &Env {
    self.env.borrow()
  }
}

}
impl<E: Borrow<Env>> Txn<E> {
  /// Borrow env
  pub fn env_borrow(&self) -> &Env {
    self.env.borrow()
  }