error[E0601]: main function not found

error[E0522]: definition of an unknown language item: `cookie`
  --> $DIR/E0522.rs:13:1
   |
LL | #[lang = "cookie"]
   | ^^^^^^^^^^^^^^^^^^ definition of unknown language item `cookie`

error: aborting due to 2 previous errors

You've got a few errors: E0522, E0601
If you want more information on an error, try using "rustc --explain E0522"