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error[E0282]: type annotations needed
--> $DIR/type-annotations-needed-expr.rs:2:39
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LL | let _ = (vec![1,2,3]).into_iter().sum() as f64;
| ^^^ cannot infer type of the type parameter `S` declared on the method `sum`
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help: consider specifying the generic argument
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LL | let _ = (vec![1,2,3]).into_iter().sum::<S>() as f64;
| +++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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