Test Box::new(array).into_iter()

Author: cuviper

src/test/ui/iterators/into-iter-on-arrays-2018.rs

@@ -1,17 +1,22 @@
 // check-pass
+// edition:2018
 
 use std::array::IntoIter;
 use std::slice::Iter;
 
 fn main() {
     let array = [0; 10];
 
-    // Before 2021, the method dispatched to `IntoIterator for &[T]`,
+    // Before 2021, the method dispatched to `IntoIterator for &[T; N]`,
     // which we continue to support for compatibility.
     let _: Iter<'_, i32> = array.into_iter();
     //~^ WARNING this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter`
     //~| WARNING this was previously accepted by the compiler but is being phased out
 
+    let _: Iter<'_, i32> = Box::new(array).into_iter();
+    //~^ WARNING this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter`
+    //~| WARNING this was previously accepted by the compiler but is being phased out
+
     // But you can always use the trait method explicitly as an array.
     let _: IntoIter<i32, 10> = IntoIterator::into_iter(array);
 }

src/test/ui/iterators/into-iter-on-arrays-2018.stderr

@@ -1,5 +1,5 @@
 warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
-  --> $DIR/into-iter-on-arrays-2018.rs:11:34
+  --> $DIR/into-iter-on-arrays-2018.rs:12:34
    |
 LL |     let _: Iter<'_, i32> = array.into_iter();
    |                                  ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
@@ -8,11 +8,20 @@ LL |     let _: Iter<'_, i32> = array.into_iter();
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
 
-warning: 1 warning emitted
+warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
+  --> $DIR/into-iter-on-arrays-2018.rs:16:44
+   |
+LL |     let _: Iter<'_, i32> = Box::new(array).into_iter();
+   |                                            ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
+
+warning: 2 warnings emitted
 
 Future incompatibility report: Future breakage date: None, diagnostic:
 warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
-  --> $DIR/into-iter-on-arrays-2018.rs:11:34
+  --> $DIR/into-iter-on-arrays-2018.rs:12:34
    |
 LL |     let _: Iter<'_, i32> = array.into_iter();
    |                                  ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
@@ -21,3 +30,13 @@ LL |     let _: Iter<'_, i32> = array.into_iter();
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
 
+Future breakage date: None, diagnostic:
+warning: this method call currently resolves to `<&[T; N] as IntoIterator>::into_iter` (due to autoref coercions), but that might change in the future when `IntoIterator` impls for arrays are added.
+  --> $DIR/into-iter-on-arrays-2018.rs:16:44
+   |
+LL |     let _: Iter<'_, i32> = Box::new(array).into_iter();
+   |                                            ^^^^^^^^^ help: use `.iter()` instead of `.into_iter()` to avoid ambiguity: `iter`
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #66145 <https://github.com/rust-lang/rust/issues/66145>
+

src/test/ui/iterators/into-iter-on-arrays-2021.rs

@@ -9,6 +9,7 @@ fn main() {
 
     // In 2021, the method dispatches to `IntoIterator for [T; N]`.
     let _: IntoIter<i32, 10> = array.into_iter();
+    let _: IntoIter<i32, 10> = Box::new(array).into_iter();
 
     // And you can always use the trait method explicitly as an array.
     let _: IntoIter<i32, 10> = IntoIterator::into_iter(array);