error[E0283]: type annotations needed --> $DIR/runaway-impl-candidate-selection.rs:13:22 | LL | println!("{:?}", iter::<_>()); | ^^^^^^^^^ cannot infer type of the type parameter `T` declared on the function `iter` | = note: cannot satisfy `_: Iterator` note: required by a bound in `iter` --> $DIR/runaway-impl-candidate-selection.rs:8:12 | LL | fn iter() -> ::Item { | ^^^^^^^^ required by this bound in `iter` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0283`.