| error[E0283]: type annotations needed |
| --> $DIR/question-mark-type-infer.rs:10:21 |
| | |
| LL | l.iter().map(f).collect()? |
| | ^^^^^^^ cannot infer type of the type parameter `B` declared on the method `collect` |
| | |
| = 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 |
| | |
| LL | l.iter().map(f).collect::<Vec<_>>()? |
| | ++++++++++ |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0283`. |