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error[E0282]: type annotations needed for `Option<_>`
--> $DIR/copy-guessing.rs:20:9
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LL | let n = None;
| ^ ---- type must be known at this point
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help: consider giving `n` an explicit type, where the type for type parameter `T` is specified
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LL | let n: Option<T> = None;
| +++++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0282`.
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