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error[E0282]: type annotations needed
--> $DIR/sort_by_key.rs:3:40
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LL | lst.sort_by_key(|&(v, _)| v.iter().sum());
| ^^^ 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 | lst.sort_by_key(|&(v, _)| v.iter().sum::<S>());
| +++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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