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error[E0282]: type annotations needed
--> $DIR/issue-6458-2.rs:3:21
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LL | format!("{:?}", None);
| ^^^^ cannot infer type of the type parameter `T` declared on the enum `Option`
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help: consider specifying the generic argument
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LL | format!("{:?}", None::<T>);
| +++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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