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error: unnecessary allocation, use `&` instead
--> $DIR/unused-allocation.rs:5:9
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LL | _ = (#[rustc_box] Box::new([1])).len();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: the lint level is defined here
--> $DIR/unused-allocation.rs:2:9
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LL | #![deny(unused_allocation)]
| ^^^^^^^^^^^^^^^^^
error: unnecessary allocation, use `&` instead
--> $DIR/unused-allocation.rs:6:9
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LL | _ = Box::new([1]).len();
| ^^^^^^^^^^^^^
error: aborting due to 2 previous errors
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