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error: unused variable: `x`
--> $DIR/issue-17999.rs:5:13
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LL | let x = ();
| ^ help: if this is intentional, prefix it with an underscore: `_x`
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note: the lint level is defined here
--> $DIR/issue-17999.rs:1:9
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LL | #![deny(unused_variables)]
| ^^^^^^^^^^^^^^^^
error: unused variable: `a`
--> $DIR/issue-17999.rs:7:13
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LL | a => {}
| ^ help: if this is intentional, prefix it with an underscore: `_a`
error: aborting due to 2 previous errors
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