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error: unused extern crate
--> $DIR/extern-crate-used.rs:18:1
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LL | extern crate core;
| ^^^^^^^^^^^^^^^^^^ unused
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note: the lint level is defined here
--> $DIR/extern-crate-used.rs:6:9
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LL | #![deny(unused_extern_crates)]
| ^^^^^^^^^^^^^^^^^^^^
help: remove the unused `extern crate`
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LL - extern crate core;
LL +
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error: aborting due to 1 previous error
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