Auto merge of #62873 - Centril:rollup-ncnuelj, r=Centril

Rollup of 14 pull requests

Successful merges:

 - #62709 (Test that maplike FromIter satisfies uniqueness)
 - #62713 (Stabilize <*mut _>::cast and <*const _>::cast)
 - #62746 ( do not use assume_init in std::io)
 - #62787 (Fix typo in src/libstd/net/udp.rs doc comment)
 - #62788 (normalize use of backticks in compiler messages for libcore/ptr)
 - #62799 (use const array repeat expressions for uninit_array)
 - #62810 (normalize use of backticks in compiler messages for librustc_lint)
 - #62812 (normalize use of backticks in compiler messages for librustc_metadata)
 - #62832 (normalize use of backticks in compiler messages for librustc_incremental)
 - #62845 (read: fix doc comment)
 - #62853 (normalize use of backticks in compiler messages for librustc/hir)
 - #62854 (Fix typo in Unicode character name)
 - #62858 (Change wrong variable name.)
 - #62870 (fix lexing of comments with many \r)

Failed merges:

r? @ghost

3 files changed, 9 insertions, 7 deletions

diff --git a/src/liballoc/collections/btree/map.rs b/src/liballoc/collections/btree/map.rs
index d466948a017..7cf779b3e72 100644
--- a/src/liballoc/collections/btree/map.rs
+++ b/src/liballoc/collections/btree/map.rs
@@ -75,10 +75,10 @@ use Entry::*;
 ///
 /// // look up the values associated with some keys.
 /// let to_find = ["Up!", "Office Space"];
-/// for book in &to_find {
-///     match movie_reviews.get(book) {
-///        Some(review) => println!("{}: {}", book, review),
-///        None => println!("{} is unreviewed.", book)
+/// for movie in &to_find {
+///     match movie_reviews.get(movie) {
+///        Some(review) => println!("{}: {}", movie, review),
+///        None => println!("{} is unreviewed.", movie)
 ///     }
 /// }
 ///
diff --git a/src/liballoc/collections/btree/node.rs b/src/liballoc/collections/btree/node.rs
index 7cf077d61d6..e067096f0c7 100644
--- a/src/liballoc/collections/btree/node.rs
+++ b/src/liballoc/collections/btree/node.rs
@@ -106,8 +106,8 @@ impl<K, V> LeafNode<K, V> {
         LeafNode {
             // As a general policy, we leave fields uninitialized if they can be, as this should
             // be both slightly faster and easier to track in Valgrind.
-            keys: uninitialized_array![_; CAPACITY],
-            vals: uninitialized_array![_; CAPACITY],
+            keys: uninit_array![_; CAPACITY],
+            vals: uninit_array![_; CAPACITY],
             parent: ptr::null(),
             parent_idx: MaybeUninit::uninit(),
             len: 0
@@ -159,7 +159,7 @@ impl<K, V> InternalNode<K, V> {
     unsafe fn new() -> Self {
         InternalNode {
             data: LeafNode::new(),
-            edges: uninitialized_array![_; 2*B],
+            edges: uninit_array![_; 2*B],
         }
     }
 }
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 2e48825e81c..dbc1f3b47c8 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -77,6 +77,7 @@
 #![feature(box_syntax)]
 #![feature(cfg_target_has_atomic)]
 #![feature(coerce_unsized)]
+#![cfg_attr(not(bootstrap), feature(const_in_array_repeat_expressions))]
 #![feature(dispatch_from_dyn)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
@@ -84,6 +85,7 @@
 #![feature(fmt_internals)]
 #![feature(fn_traits)]
 #![feature(fundamental)]
+#![feature(internal_uninit_const)]
 #![feature(lang_items)]
 #![feature(libc)]
 #![feature(nll)]