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