using #![cfg(feature = "stable_dag")] in lib.rs breaks lib export

[highway900]

new to rust, I have a very simple application that simply won't compile when I use daggy with #![cfg(feature = "stable_dag")] the stable graph feature enabled. It feels like I am doing something silly here. But if I remove the cfg and use Dag instead of StableDag everything works fine.

src/lib.rs is as so

#![cfg(feature = "stable_dag")]
extern crate daggy;

pub fn test() {
    println!("Test stable dag");
}

 --> src/bin/main.rs:1:5
  |
1 | use mylib::test;
  |     ^^^^^^^^^^^^ no `test` in the root

mylib is defined in my Cargo.toml like so

[lib]
name = "mylib"
path = "src/lib.rs"