error: irrefutable `if let` pattern --> $DIR/deny-irrefutable-let-patterns.rs:6:8 | LL | if let _ = 5 {} | ^^^^^^^^^ | = note: this pattern will always match, so the `if let` is useless = help: consider replacing the `if let` with a `let` note: the lint level is defined here --> $DIR/deny-irrefutable-let-patterns.rs:3:9 | LL | #![deny(irrefutable_let_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^ error: irrefutable `while let` pattern --> $DIR/deny-irrefutable-let-patterns.rs:8:11 | LL | while let _ = 5 { | ^^^^^^^^^ | = note: this pattern will always match, so the loop will never exit = help: consider instead using a `loop { ... }` with a `let` inside it error: irrefutable `if let` guard pattern --> $DIR/deny-irrefutable-let-patterns.rs:13:18 | LL | _ if let _ = 2 => {} | ^ | = 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: aborting due to 3 previous errors