error[E0277]: the size for values of type `dyn Iterator` cannot be known at compilation time --> $DIR/issue-20605.rs:5:17 | LL | for item in *things { *item = 0 } | ^^^^^^^ the trait `IntoIterator` is not implemented for `dyn Iterator` | = note: the trait bound `dyn Iterator: IntoIterator` is not satisfied = note: required for `dyn Iterator` to implement `IntoIterator` help: consider mutably borrowing here | LL | for item in &mut *things { *item = 0 } | ++++ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.