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error: irrefutable `if let` guard pattern
--> $DIR/warns.rs:6:24
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LL | Some(x) if let () = x => {}
| ^^
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note: the lint level is defined here
--> $DIR/warns.rs:3:8
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LL | #[deny(irrefutable_let_patterns)]
| ^^^^^^^^^^^^^^^^^^^^^^^^
= note: this pattern will always match, so the guard is useless
= help: consider removing the guard and adding a `let` inside the match arm
error: unreachable pattern
--> $DIR/warns.rs:15:25
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LL | x if let None | None = x => {}
| ^^^^
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note: the lint level is defined here
--> $DIR/warns.rs:12:8
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LL | #[deny(unreachable_patterns)]
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 2 previous errors
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