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error: unused variable: `a`
--> $DIR/issue-22599.rs:8:19
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LL | v = match 0 { a => 0 };
| ^ help: if this is intentional, prefix it with an underscore: `_a`
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note: the lint level is defined here
--> $DIR/issue-22599.rs:1:9
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LL | #![deny(unused_variables)]
| ^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
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