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error[E0282]: type annotations needed
--> $DIR/question-mark-type-infer.rs:10:21
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LL | l.iter().map(f).collect()?
| ^^^^^^^ cannot infer type of the type parameter `B` declared on the method `collect`
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help: consider specifying the generic argument
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LL | l.iter().map(f).collect::<Vec<_>>()?
| ++++++++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0282`.
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