激活动作返回值协议

cleos push action eosio activate '["c3a6138c5061cf291310887c0b5c71fcaffeab90d5deb50d3b9e687cead45071"]'

查询是否已开启

curl -X POST http://localhost:8888/v1/producer/get_supported_protocol_features | jq -r

...
{                                                                                                                                      
    "feature_digest": "c3a6138c5061cf291310887c0b5c71fcaffeab90d5deb50d3b9e687cead45071",
    "subjective_restrictions": {
      "enabled": true,
      "preactivation_required": true,
      "earliest_allowed_activation_time": "1970-01-01T00:00:00.000"
    },
    "description_digest": "69b064c5178e2738e144ed6caa9349a3995370d78db29e494b3126ebd9111966",
    "dependencies": [],
    "protocol_feature_type": "builtin",
    "specification": [
      {
        "name": "builtin_feature_codename",
        "value": "ACTION_RETURN_VALUE"
      }
    ]
  }
...