warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021
  --> $DIR/into-iter-on-arrays-2018.rs:14:34
   |
LL |     let _: Iter<'_, i32> = array.into_iter();
   |                                  ^^^^^^^^^
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>
   = note: `#[warn(array_into_iter)]` on by default
help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
   |
LL |     let _: Iter<'_, i32> = array.iter();
   |                                  ~~~~
help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
   |
LL |     let _: Iter<'_, i32> = IntoIterator::into_iter(array);
   |                            ++++++++++++++++++++++++     ~

warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021
  --> $DIR/into-iter-on-arrays-2018.rs:18:44
   |
LL |     let _: Iter<'_, i32> = Box::new(array).into_iter();
   |                                            ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>

warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021
  --> $DIR/into-iter-on-arrays-2018.rs:22:43
   |
LL |     let _: Iter<'_, i32> = Rc::new(array).into_iter();
   |                                           ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>

warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021
  --> $DIR/into-iter-on-arrays-2018.rs:25:41
   |
LL |     let _: Iter<'_, i32> = Array(array).into_iter();
   |                                         ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>

warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to <[T; N] as IntoIterator>::into_iter in Rust 2021
  --> $DIR/into-iter-on-arrays-2018.rs:32:24
   |
LL |     for _ in [1, 2, 3].into_iter() {}
   |                        ^^^^^^^^^
   |
   = warning: this changes meaning in Rust 2021
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/IntoIterator-for-arrays.html>
help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
   |
LL |     for _ in [1, 2, 3].iter() {}
   |                        ~~~~
help: or remove `.into_iter()` to iterate by value
   |
LL -     for _ in [1, 2, 3].into_iter() {}
LL +     for _ in [1, 2, 3] {}
   |

warning: 5 warnings emitted