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1 error[E0282]: type annotations needed
2   --> $DIR/type-annotations-needed-expr.rs:2:39
3    |
4 LL |     let _ = (vec![1,2,3]).into_iter().sum() as f64;
5    |                                       ^^^
6    |                                       |
7    |                                       cannot infer type for `S`
8    |                                       help: consider specifying the type argument in the method call: `sum::<_>`
9    |
10    = note: type must be known at this point
11
12 error: aborting due to previous error
13
14 For more information about this error, try `rustc --explain E0282`.