src/test/ui/inference/question-mark-type-infer.stderr

   1 error[E0282]: type annotations needed
   2   --> $DIR/question-mark-type-infer.rs:10:30
   3    |
   4 LL |     l.iter().map(f).collect()?
   5    |                              ^ cannot infer type
   6
   7 error: aborting due to previous error
   8
   9 For more information about this error, try `rustc --explain E0282`.