Auto merge of #45261 - kennytm:rollup, r=kennytm

Rollup of 14 pull requests

- Successful merges: #44855, #45110, #45122, #45133, #45173, #45178, #45189, #45203, #45209, #45221, #45236, #45240, #45245, #45253
- Failed merges:

2 files changed, 25 insertions, 1 deletions

diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index d51aaa23c6a..0cbfc9e9dac 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -121,6 +121,7 @@
 #![feature(unique)]
 #![feature(unsize)]
 #![feature(allocator_internals)]
+#![feature(on_unimplemented)]
 
 #![cfg_attr(not(test), feature(fused, fn_traits, placement_new_protocol, swap_with_slice, i128))]
 #![cfg_attr(test, feature(test, box_heap))]
diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 861291194f3..cf34e195dea 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -1543,6 +1543,7 @@ impl<T: Hash> Hash for Vec<T> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> Index<usize> for Vec<T> {
     type Output = T;
 
@@ -1554,6 +1555,7 @@ impl<T> Index<usize> for Vec<T> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> IndexMut<usize> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: usize) -> &mut T {
@@ -1562,8 +1564,8 @@ impl<T> IndexMut<usize> for Vec<T> {
     }
 }
 
-
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::Range<usize>> for Vec<T> {
     type Output = [T];
 
@@ -1572,7 +1574,9 @@ impl<T> ops::Index<ops::Range<usize>> for Vec<T> {
         Index::index(&**self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::RangeTo<usize>> for Vec<T> {
     type Output = [T];
 
@@ -1581,7 +1585,9 @@ impl<T> ops::Index<ops::RangeTo<usize>> for Vec<T> {
         Index::index(&**self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::RangeFrom<usize>> for Vec<T> {
     type Output = [T];
 
@@ -1590,7 +1596,9 @@ impl<T> ops::Index<ops::RangeFrom<usize>> for Vec<T> {
         Index::index(&**self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::RangeFull> for Vec<T> {
     type Output = [T];
 
@@ -1599,7 +1607,9 @@ impl<T> ops::Index<ops::RangeFull> for Vec<T> {
         self
     }
 }
+
 #[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::RangeInclusive<usize>> for Vec<T> {
     type Output = [T];
 
@@ -1608,7 +1618,9 @@ impl<T> ops::Index<ops::RangeInclusive<usize>> for Vec<T> {
         Index::index(&**self, index)
     }
 }
+
 #[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::Index<ops::RangeToInclusive<usize>> for Vec<T> {
     type Output = [T];
 
@@ -1619,41 +1631,52 @@ impl<T> ops::Index<ops::RangeToInclusive<usize>> for Vec<T> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::Range<usize>> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: ops::Range<usize>) -> &mut [T] {
         IndexMut::index_mut(&mut **self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::RangeTo<usize>> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: ops::RangeTo<usize>) -> &mut [T] {
         IndexMut::index_mut(&mut **self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::RangeFrom<usize>> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: ops::RangeFrom<usize>) -> &mut [T] {
         IndexMut::index_mut(&mut **self, index)
     }
 }
+
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::RangeFull> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, _index: ops::RangeFull) -> &mut [T] {
         self
     }
 }
+
 #[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::RangeInclusive<usize>> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: ops::RangeInclusive<usize>) -> &mut [T] {
         IndexMut::index_mut(&mut **self, index)
     }
 }
+
 #[unstable(feature = "inclusive_range", reason = "recently added, follows RFC", issue = "28237")]
+#[rustc_on_unimplemented = "vector indices are of type `usize` or ranges of `usize`"]
 impl<T> ops::IndexMut<ops::RangeToInclusive<usize>> for Vec<T> {
     #[inline]
     fn index_mut(&mut self, index: ops::RangeToInclusive<usize>) -> &mut [T] {