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warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:8:1
   |
LL | extern crate removing_extern_crate as foo;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
   |
note: the lint level is defined here
  --> $DIR/removing-extern-crate.rs:6:9
   |
LL | #![warn(rust_2018_idioms)]
   |         ^^^^^^^^^^^^^^^^
   = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:9:1
   |
LL | extern crate core;
   | ^^^^^^^^^^^^^^^^^^ help: remove it

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:12:5
   |
LL |     extern crate removing_extern_crate as foo;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it

warning: unused extern crate
  --> $DIR/removing-extern-crate.rs:13:5
   |
LL |     extern crate core;
   |     ^^^^^^^^^^^^^^^^^^ help: remove it

warning: 4 warnings emitted