Merge pull request #1889 from rust-lang/rustc-pull

Rustc pull update

1 files changed, 18 insertions, 0 deletions

diff --git a/library/core/src/range.rs b/library/core/src/range.rs
index 5cd7956291c..7158fa0fcf0 100644
--- a/library/core/src/range.rs
+++ b/library/core/src/range.rs
@@ -167,6 +167,12 @@ impl<T> RangeBounds<T> for Range<T> {
     }
 }
 
+// This impl intentionally does not have `T: ?Sized`;
+// see https://github.com/rust-lang/rust/pull/61584 for discussion of why.
+//
+/// If you need to use this implementation where `T` is unsized,
+/// consider using the `RangeBounds` impl for a 2-tuple of [`Bound<&T>`][Bound],
+/// i.e. replace `start..end` with `(Bound::Included(start), Bound::Excluded(end))`.
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> RangeBounds<T> for Range<&T> {
     fn start_bound(&self) -> Bound<&T> {
@@ -346,6 +352,12 @@ impl<T> RangeBounds<T> for RangeInclusive<T> {
     }
 }
 
+// This impl intentionally does not have `T: ?Sized`;
+// see https://github.com/rust-lang/rust/pull/61584 for discussion of why.
+//
+/// If you need to use this implementation where `T` is unsized,
+/// consider using the `RangeBounds` impl for a 2-tuple of [`Bound<&T>`][Bound],
+/// i.e. replace `start..=end` with `(Bound::Included(start), Bound::Included(end))`.
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> RangeBounds<T> for RangeInclusive<&T> {
     fn start_bound(&self) -> Bound<&T> {
@@ -491,6 +503,12 @@ impl<T> RangeBounds<T> for RangeFrom<T> {
     }
 }
 
+// This impl intentionally does not have `T: ?Sized`;
+// see https://github.com/rust-lang/rust/pull/61584 for discussion of why.
+//
+/// If you need to use this implementation where `T` is unsized,
+/// consider using the `RangeBounds` impl for a 2-tuple of [`Bound<&T>`][Bound],
+/// i.e. replace `start..` with `(Bound::Included(start), Bound::Unbounded)`.
 #[unstable(feature = "new_range_api", issue = "125687")]
 impl<T> RangeBounds<T> for RangeFrom<&T> {
     fn start_bound(&self) -> Bound<&T> {