mirror of https://github.com/rust-lang/rust
44 lines
1.9 KiB
Rust
44 lines
1.9 KiB
Rust
//@ check-pass
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fn main() {
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// Common
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for _ in Some(1) {}
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//~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement
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//~| HELP to check pattern in a loop use `while let`
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//~| HELP consider using `if let` to clear intent
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for _ in Ok::<_, ()>(1) {}
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//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
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//~| HELP to check pattern in a loop use `while let`
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//~| HELP consider using `if let` to clear intent
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// `Iterator::next` specific
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for _ in [0; 0].iter().next() {}
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//~^ WARN for loop over an `Option`. This is more readably written as an `if let` statement
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//~| HELP to iterate over `[0; 0].iter()` remove the call to `next`
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//~| HELP consider using `if let` to clear intent
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// `Result<impl Iterator, _>`, but function doesn't return `Result`
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for _ in Ok::<_, ()>([0; 0].iter()) {}
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//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
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//~| HELP to check pattern in a loop use `while let`
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//~| HELP consider using `if let` to clear intent
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}
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fn _returns_result() -> Result<(), ()> {
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// `Result<impl Iterator, _>`
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for _ in Ok::<_, ()>([0; 0].iter()) {}
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//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
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//~| HELP to check pattern in a loop use `while let`
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//~| HELP consider unwrapping the `Result` with `?` to iterate over its contents
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//~| HELP consider using `if let` to clear intent
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// `Result<impl IntoIterator>`
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for _ in Ok::<_, ()>([0; 0]) {}
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//~^ WARN for loop over a `Result`. This is more readably written as an `if let` statement
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//~| HELP to check pattern in a loop use `while let`
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//~| HELP consider unwrapping the `Result` with `?` to iterate over its contents
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//~| HELP consider using `if let` to clear intent
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Ok(())
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}
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