message: [lang/tests] Add nightly feature for erc20 to make it compile
diff: // You should have received a copy of the GNU General Public License
  // along with pDSL. If not, see <http://www.gnu.org/licenses/>.
  +#![feature(const_str_as_bytes)]
  +
  use pdsl_core::{
  env::{
  Address,
  