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error[E0282]: type annotations needed for the closure `fn((), ()) -> Result<(), _>`
--> $DIR/cannot-infer-closure.rs:4:9
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LL | Ok(b)
| ^^ cannot infer type for type parameter `E` declared on the enum `Result`
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help: give this closure an explicit return type without `_` placeholders
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LL | let x = |a: (), b: ()| -> Result<(), _> {
| ++++++++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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