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warning: unused extern crate
  --> $DIR/edition-extern-crate-allowed.rs:7:1
   |
LL | extern crate edition_extern_crate_allowed;
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
   |
note: the lint level is defined here
  --> $DIR/edition-extern-crate-allowed.rs:5:9
   |
LL | #![warn(rust_2018_idioms)]
   |         ^^^^^^^^^^^^^^^^
   = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`

warning: 1 warning emitted