warning: applying the `#[macro_use]` attribute to an `extern crate` item is deprecated
  --> $DIR/macro-use-warned-against.rs:7:1
   |
LL | #[macro_use]
   | ^^^^^^^^^^^^
   |
   = help: remove it and import macros at use sites with a `use` item instead
note: the lint level is defined here
  --> $DIR/macro-use-warned-against.rs:5:9
   |
LL | #![warn(macro_use_extern_crate, unused)]
   |         ^^^^^^^^^^^^^^^^^^^^^^

warning: unused `#[macro_use]` import
  --> $DIR/macro-use-warned-against.rs:9:1
   |
LL | #[macro_use]
   | ^^^^^^^^^^^^
   |
note: the lint level is defined here
  --> $DIR/macro-use-warned-against.rs:5:33
   |
LL | #![warn(macro_use_extern_crate, unused)]
   |                                 ^^^^^^
   = note: `#[warn(unused_imports)]` implied by `#[warn(unused)]`

warning: 2 warnings emitted