rust-book-cn/listings/ch18-patterns-and-matching/listing-18-10/output.txt
2021-05-09 14:49:31 +08:00

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$ cargo run
Compiling patterns v0.1.0 (file:///projects/patterns)
warning: irrefutable `if let` pattern
--> src/main.rs:2:5
|
2 | / if let x = 5 {
3 | | println!("{}", x);
4 | | };
| |_____^
|
= note: `#[warn(irrefutable_let_patterns)]` on by default
= note: this pattern will always match, so the `if let` is useless
= help: consider replacing the `if let` with a `let`
warning: 1 warning emitted
Finished dev [unoptimized + debuginfo] target(s) in 0.39s
Running `target/debug/patterns`
5