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$ cargo run
Compiling patterns v0.1.0 (file:///projects/patterns)
warning: irrefutable `if let` pattern
--> src/main.rs:2:8
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2 | if let x = 5 {
| ^^^^^^^^^
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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: `patterns` (bin "patterns") generated 1 warning
Finished dev [unoptimized + debuginfo] target(s) in 0.39s
Running `target/debug/patterns`
5
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