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error[E0282]: type annotations needed for the closure `fn((), ()) -> std::result::Result<(), _>`
--> $DIR/cannot-infer-closure.rs:3:9
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LL | Err(a)?;
| ^^^^^^^ cannot infer type
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help: give this closure an explicit return type without `_` placeholders
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LL | let x = |a: (), b: ()| -> std::result::Result<(), _> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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