enabling a feature when using libraries

Question

I'm trying to use DefaultAsyncInterface of tunio which depends on tokio feature (here)

I have added tunio with async-tokio feature in Cargo.toml:

[dependencies]
env_logger = "0.10.0"
etherparse = "0.13.0"
futures = "0.3.25"
netconfig = "0.4.0"
tokio = { version = "1.24.1", features = ["full"] }
tunio = { version = "0.3.0", features = ["async-tokio"] }

and imported it:

use tunio::{DefaultDriver,DefaultAsyncInterface};

but when I try to build I get:

error[E0432]: unresolved import `tunio::DefaultAsyncInterface`
 --> src/main.rs:7:27
  |
7 | use tunio::{DefaultDriver,DefaultAsyncInterface};
  |                           ^^^^^^^^^^^^^^^^^^^^^
  |                           |
  |                           no `DefaultAsyncInterface` in the root
  |                           help: a similar name exists in the module: `DefaultInterface`

It seems the async-tokio feature is not used
What is the problem?