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error: variable does not need to be mutable
--> $DIR/unused-mut-issue-50343.rs:7:33
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LL | vec![(42, 22)].iter().map(|(mut x, _y)| ()).count();
| ----^
| |
| help: remove this `mut`
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note: the lint level is defined here
--> $DIR/unused-mut-issue-50343.rs:3:9
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LL | #![deny(unused_mut)]
| ^^^^^^^^^^
error: aborting due to previous error
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