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error[E0283]: 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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= note: cannot satisfy `_: FromIterator<Result<i32, ()>>`
note: required by a bound in `collect`
--> $SRC_DIR/core/src/iter/traits/iterator.rs:LL:COL
help: consider specifying the generic argument
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LL | l.iter().map(f).collect::<Vec<_>>()?
| ++++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0283`.
|
