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