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warning: irrefutable `if let` pattern
--> $DIR/issue-78720.rs:6:8
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LL | if let a = "" {
| ^^^^^^^^^^
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= note: this pattern will always match, so the `if let` is useless
= help: consider replacing the `if let` with a `let`
= note: `#[warn(irrefutable_let_patterns)]` on by default
warning: 1 warning emitted
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