Auto merge of #90602 - mbartlett21:const-intoiterator, r=oli-obk

bors · bors · commit 6515eb8316bd · 2022-04-23T15:41:45.000Z
Unstably constify `impl&lt;I: Iterator&gt; IntoIterator for I`

This constifies the default `IntoIterator` implementation under the `const_intoiterator_identity` feature.

Tracking Issue: #90603
diff --git a/core/src/iter/traits/collect.rs b/core/src/iter/traits/collect.rs
@@ -267,8 +267,9 @@ pub trait IntoIterator {
     fn into_iter(self) -> Self::IntoIter;
 }
 
+#[rustc_const_unstable(feature = "const_intoiterator_identity", issue = "90603")]
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<I: Iterator> IntoIterator for I {
+impl<I: ~const Iterator> const IntoIterator for I {
     type Item = I::Item;
     type IntoIter = I;
 

Original file line number	Diff line number	Diff line change
`@@ -267,8 +267,9 @@ pub trait IntoIterator {`
`267`	`267`	`fn into_iter(self) -> Self::IntoIter;`
`268`	`268`	`}`
`269`	`269`
	`270`	`+#[rustc_const_unstable(feature = "const_intoiterator_identity", issue = "90603")]`
`270`	`271`	`#[stable(feature = "rust1", since = "1.0.0")]`
`271`		`-impl<I: Iterator> IntoIterator for I {`
	`272`	`+impl<I: ~const Iterator> const IntoIterator for I {`
`272`	`273`	`type Item = I::Item;`
`273`	`274`	`type IntoIter = I;`
`274`	`275`