mirror of https://github.com/rust-lang/rust
20 lines
723 B
Plaintext
20 lines
723 B
Plaintext
error[E0283]: type annotations needed
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--> $DIR/sort_by_key.rs:3:40
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LL | lst.sort_by_key(|&(v, _)| v.iter().sum());
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| ----------- ^^^ cannot infer type of the type parameter `S` declared on the method `sum`
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| type must be known at this point
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= note: cannot satisfy `_: Ord`
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note: required by a bound in `slice::<impl [T]>::sort_by_key`
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--> $SRC_DIR/alloc/src/slice.rs:LL:COL
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help: consider specifying the generic argument
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LL | lst.sort_by_key(|&(v, _)| v.iter().sum::<S>());
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| +++++
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0283`.
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