main.rs

#[macro_use]
extern crate serde_derive;

mod types;

fn main() {
    println!("Hello, world!");
}

output.txt

error[E0463]: can't find crate for `_serde`
 --> src/types.rs:1:10
  |
1 | #[derive(Deserialize)]
  |          ^^^^^^^^^^^ can't find crate

error: aborting due to previous error

error: Could not compile `test_derive`.

types.rs

#[derive(Deserialize)]
struct Test{
    test: u64
}