diff --git a/README.md b/README.md
index a7e23d8ac2caa..6cf9577d3330e 100644
--- a/README.md
+++ b/README.md
@@ -243,6 +243,8 @@ The Rust community congregates in a few places:
 If you are interested in contributing to the Rust project, please take a look
 at the [Getting Started][gettingstarted] guide in the [rustc-dev-guide].
 
+[rustc-dev-guide]: https://rustc-dev-guide.rust-lang.org
+
 ## License
 
 Rust is primarily distributed under the terms of both the MIT license
diff --git a/compiler/rustc_ast/src/token.rs b/compiler/rustc_ast/src/token.rs
index a2c651d1537b5..09c0983bb9d1a 100644
--- a/compiler/rustc_ast/src/token.rs
+++ b/compiler/rustc_ast/src/token.rs
@@ -173,6 +173,7 @@ pub fn ident_can_begin_expr(name: Symbol, span: Span, is_raw: bool) -> bool {
             kw::Move,
             kw::Return,
             kw::True,
+            kw::Try,
             kw::Unsafe,
             kw::While,
             kw::Yield,
diff --git a/compiler/rustc_ast_passes/src/feature_gate.rs b/compiler/rustc_ast_passes/src/feature_gate.rs
index 0ee8ef55e61bf..97e6b363eff60 100644
--- a/compiler/rustc_ast_passes/src/feature_gate.rs
+++ b/compiler/rustc_ast_passes/src/feature_gate.rs
@@ -608,6 +608,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
 
 pub fn check_crate(krate: &ast::Crate, sess: &Session) {
     maybe_stage_features(sess, krate);
+    check_incompatible_features(sess);
     let mut visitor = PostExpansionVisitor { sess, features: &sess.features_untracked() };
 
     let spans = sess.parse_sess.gated_spans.spans.borrow();
@@ -677,3 +678,36 @@ fn maybe_stage_features(sess: &Session, krate: &ast::Crate) {
         }
     }
 }
+
+fn check_incompatible_features(sess: &Session) {
+    let features = sess.features_untracked();
+
+    let declared_features = features
+        .declared_lang_features
+        .iter()
+        .copied()
+        .map(|(name, span, _)| (name, span))
+        .chain(features.declared_lib_features.iter().copied());
+
+    for (f1, f2) in rustc_feature::INCOMPATIBLE_FEATURES
+        .iter()
+        .filter(|&&(f1, f2)| features.enabled(f1) && features.enabled(f2))
+    {
+        if let Some((f1_name, f1_span)) = declared_features.clone().find(|(name, _)| name == f1) {
+            if let Some((f2_name, f2_span)) = declared_features.clone().find(|(name, _)| name == f2)
+            {
+                let spans = vec![f1_span, f2_span];
+                sess.struct_span_err(
+                    spans.clone(),
+                    &format!(
+                        "features `{}` and `{}` are incompatible, using them at the same time \
+                        is not allowed",
+                        f1_name, f2_name
+                    ),
+                )
+                .help("remove one of these features")
+                .emit();
+            }
+        }
+    }
+}
diff --git a/compiler/rustc_data_structures/src/graph/iterate/mod.rs b/compiler/rustc_data_structures/src/graph/iterate/mod.rs
index 64ff6130ddffb..bc3d1ce53bac5 100644
--- a/compiler/rustc_data_structures/src/graph/iterate/mod.rs
+++ b/compiler/rustc_data_structures/src/graph/iterate/mod.rs
@@ -87,11 +87,8 @@ where
 }
 
 /// Allows searches to terminate early with a value.
-#[derive(Clone, Copy, Debug)]
-pub enum ControlFlow<T> {
-    Break(T),
-    Continue,
-}
+// FIXME (#75744): remove the alias once the generics are in a better order and `C=()`.
+pub type ControlFlow<T> = std::ops::ControlFlow<(), T>;
 
 /// The status of a node in the depth-first search.
 ///
@@ -260,12 +257,12 @@ where
         _node: G::Node,
         _prior_status: Option<NodeStatus>,
     ) -> ControlFlow<Self::BreakVal> {
-        ControlFlow::Continue
+        ControlFlow::CONTINUE
     }
 
     /// Called after all nodes reachable from this one have been examined.
     fn node_settled(&mut self, _node: G::Node) -> ControlFlow<Self::BreakVal> {
-        ControlFlow::Continue
+        ControlFlow::CONTINUE
     }
 
     /// Behave as if no edges exist from `source` to `target`.
@@ -289,8 +286,8 @@ where
         prior_status: Option<NodeStatus>,
     ) -> ControlFlow<Self::BreakVal> {
         match prior_status {
-            Some(NodeStatus::Visited) => ControlFlow::Break(()),
-            _ => ControlFlow::Continue,
+            Some(NodeStatus::Visited) => ControlFlow::BREAK,
+            _ => ControlFlow::CONTINUE,
         }
     }
 }
diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index de4e7a1342431..88c160e93b66a 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -8,6 +8,7 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![allow(incomplete_features)]
+#![feature(control_flow_enum)]
 #![feature(in_band_lifetimes)]
 #![feature(unboxed_closures)]
 #![feature(generators)]
diff --git a/compiler/rustc_feature/src/active.rs b/compiler/rustc_feature/src/active.rs
index e858980738d71..3d7b3da45ccb9 100644
--- a/compiler/rustc_feature/src/active.rs
+++ b/compiler/rustc_feature/src/active.rs
@@ -605,3 +605,8 @@ pub const INCOMPLETE_FEATURES: &[Symbol] = &[
     sym::lazy_normalization_consts,
     sym::specialization,
 ];
+
+/// Some features are not allowed to be used together at the same time, if
+/// the two are present, produce an error
+pub const INCOMPATIBLE_FEATURES: &[(Symbol, Symbol)] =
+    &[(sym::const_generics, sym::min_const_generics)];
diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs
index 4393368cd4524..15564a59658cb 100644
--- a/compiler/rustc_feature/src/lib.rs
+++ b/compiler/rustc_feature/src/lib.rs
@@ -131,7 +131,7 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option<NonZeroU3
 }
 
 pub use accepted::ACCEPTED_FEATURES;
-pub use active::{Features, ACTIVE_FEATURES, INCOMPLETE_FEATURES};
+pub use active::{Features, ACTIVE_FEATURES, INCOMPATIBLE_FEATURES, INCOMPLETE_FEATURES};
 pub use builtin_attrs::{
     deprecated_attributes, find_gated_cfg, is_builtin_attr_name, AttributeGate, AttributeTemplate,
     AttributeType, BuiltinAttribute, GatedCfg, BUILTIN_ATTRIBUTES, BUILTIN_ATTRIBUTE_MAP,
diff --git a/compiler/rustc_mir_build/src/lib.rs b/compiler/rustc_mir_build/src/lib.rs
index 313bb979a5161..e55180ff4be52 100644
--- a/compiler/rustc_mir_build/src/lib.rs
+++ b/compiler/rustc_mir_build/src/lib.rs
@@ -6,6 +6,7 @@
 #![feature(box_syntax)]
 #![feature(const_fn)]
 #![feature(const_panic)]
+#![feature(control_flow_enum)]
 #![feature(crate_visibility_modifier)]
 #![feature(bool_to_option)]
 #![feature(or_patterns)]
diff --git a/compiler/rustc_mir_build/src/lints.rs b/compiler/rustc_mir_build/src/lints.rs
index 22ce278cee02c..a8d7c612a8419 100644
--- a/compiler/rustc_mir_build/src/lints.rs
+++ b/compiler/rustc_mir_build/src/lints.rs
@@ -117,7 +117,7 @@ impl<'mir, 'tcx> TriColorVisitor<&'mir Body<'tcx>> for Search<'mir, 'tcx> {
             // A diverging InlineAsm is treated as non-recursing
             TerminatorKind::InlineAsm { destination, .. } => {
                 if destination.is_some() {
-                    ControlFlow::Continue
+                    ControlFlow::CONTINUE
                 } else {
                     ControlFlow::Break(NonRecursive)
                 }
@@ -131,7 +131,7 @@ impl<'mir, 'tcx> TriColorVisitor<&'mir Body<'tcx>> for Search<'mir, 'tcx> {
             | TerminatorKind::FalseEdge { .. }
             | TerminatorKind::FalseUnwind { .. }
             | TerminatorKind::Goto { .. }
-            | TerminatorKind::SwitchInt { .. } => ControlFlow::Continue,
+            | TerminatorKind::SwitchInt { .. } => ControlFlow::CONTINUE,
         }
     }
 
@@ -144,7 +144,7 @@ impl<'mir, 'tcx> TriColorVisitor<&'mir Body<'tcx>> for Search<'mir, 'tcx> {
             }
         }
 
-        ControlFlow::Continue
+        ControlFlow::CONTINUE
     }
 
     fn ignore_edge(&mut self, bb: BasicBlock, target: BasicBlock) -> bool {
diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index 011ea32d0cfc2..eba7ffae22c4c 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -120,6 +120,9 @@ use crate::raw_vec::RawVec;
 /// assert_eq!(vec, [0, 0, 0, 0, 0]);
 /// ```
 ///
+/// For more information, see
+/// [Capacity and Reallocation](#capacity-and-reallocation).
+///
 /// Use a `Vec<T>` as an efficient stack:
 ///
 /// ```
diff --git a/library/alloc/tests/borrow.rs b/library/alloc/tests/borrow.rs
index 8bfcf323f674a..57976aa6cdfdf 100644
--- a/library/alloc/tests/borrow.rs
+++ b/library/alloc/tests/borrow.rs
@@ -45,3 +45,16 @@ fn test_from_cow_path() {
     let path = Path::new("hello");
     test_from_cow!(path: &Path);
 }
+
+#[test]
+fn cow_const() {
+    // test that the methods of `Cow` are usable in a const context
+
+    const COW: Cow<'_, str> = Cow::Borrowed("moo");
+
+    const IS_BORROWED: bool = COW.is_borrowed();
+    assert!(IS_BORROWED);
+
+    const IS_OWNED: bool = COW.is_owned();
+    assert!(!IS_OWNED);
+}
diff --git a/library/alloc/tests/lib.rs b/library/alloc/tests/lib.rs
index b1513d1b05655..590639d983481 100644
--- a/library/alloc/tests/lib.rs
+++ b/library/alloc/tests/lib.rs
@@ -1,5 +1,6 @@
 #![feature(allocator_api)]
 #![feature(box_syntax)]
+#![feature(cow_is_borrowed)]
 #![feature(drain_filter)]
 #![feature(exact_size_is_empty)]
 #![feature(new_uninit)]
diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
index 8e66c8a22cec5..53b0d0a271844 100644
--- a/library/alloc/tests/vec.rs
+++ b/library/alloc/tests/vec.rs
@@ -74,6 +74,42 @@ fn test_zst_capacity() {
     assert_eq!(Vec::<()>::new().capacity(), usize::MAX);
 }
 
+#[test]
+fn test_indexing() {
+    let v: Vec<isize> = vec![10, 20];
+    assert_eq!(v[0], 10);
+    assert_eq!(v[1], 20);
+    let mut x: usize = 0;
+    assert_eq!(v[x], 10);
+    assert_eq!(v[x + 1], 20);
+    x = x + 1;
+    assert_eq!(v[x], 20);
+    assert_eq!(v[x - 1], 10);
+}
+
+#[test]
+fn test_debug_fmt() {
+    let vec1: Vec<isize> = vec![];
+    assert_eq!("[]", format!("{:?}", vec1));
+
+    let vec2 = vec![0, 1];
+    assert_eq!("[0, 1]", format!("{:?}", vec2));
+
+    let slice: &[isize] = &[4, 5];
+    assert_eq!("[4, 5]", format!("{:?}", slice));
+}
+
+#[test]
+fn test_push() {
+    let mut v = vec![];
+    v.push(1);
+    assert_eq!(v, [1]);
+    v.push(2);
+    assert_eq!(v, [1, 2]);
+    v.push(3);
+    assert_eq!(v, [1, 2, 3]);
+}
+
 #[test]
 fn test_extend() {
     let mut v = Vec::new();
@@ -119,6 +155,18 @@ fn test_extend() {
     assert_eq!(count_x, 1);
 }
 
+#[test]
+fn test_extend_from_slice() {
+    let a: Vec<isize> = vec![1, 2, 3, 4, 5];
+    let b: Vec<isize> = vec![6, 7, 8, 9, 0];
+
+    let mut v: Vec<isize> = a;
+
+    v.extend_from_slice(&b);
+
+    assert_eq!(v, [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]);
+}
+
 #[test]
 fn test_extend_ref() {
     let mut v = vec![1, 2];
@@ -134,6 +182,14 @@ fn test_extend_ref() {
     assert_eq!(v, [1, 2, 3, 4, 5, 6, 7]);
 }
 
+#[test]
+fn test_slice_from_ref() {
+    let values = vec![1, 2, 3, 4, 5];
+    let slice = &values[1..3];
+
+    assert_eq!(slice, [2, 3]);
+}
+
 #[test]
 fn test_slice_from_mut() {
     let mut values = vec![1, 2, 3, 4, 5];
@@ -345,6 +401,29 @@ fn test_zip_unzip() {
     assert_eq!((3, 6), (left[2], right[2]));
 }
 
+#[test]
+fn test_cmp() {
+    let x: &[isize] = &[1, 2, 3, 4, 5];
+    let cmp: &[isize] = &[1, 2, 3, 4, 5];
+    assert_eq!(&x[..], cmp);
+    let cmp: &[isize] = &[3, 4, 5];
+    assert_eq!(&x[2..], cmp);
+    let cmp: &[isize] = &[1, 2, 3];
+    assert_eq!(&x[..3], cmp);
+    let cmp: &[isize] = &[2, 3, 4];
+    assert_eq!(&x[1..4], cmp);
+
+    let x: Vec<isize> = vec![1, 2, 3, 4, 5];
+    let cmp: &[isize] = &[1, 2, 3, 4, 5];
+    assert_eq!(&x[..], cmp);
+    let cmp: &[isize] = &[3, 4, 5];
+    assert_eq!(&x[2..], cmp);
+    let cmp: &[isize] = &[1, 2, 3];
+    assert_eq!(&x[..3], cmp);
+    let cmp: &[isize] = &[2, 3, 4];
+    assert_eq!(&x[1..4], cmp);
+}
+
 #[test]
 fn test_vec_truncate_drop() {
     static mut DROPS: u32 = 0;
diff --git a/library/core/src/intrinsics.rs b/library/core/src/intrinsics.rs
index 25951e2f58235..dd9af2d07e770 100644
--- a/library/core/src/intrinsics.rs
+++ b/library/core/src/intrinsics.rs
@@ -831,7 +831,7 @@ extern "rust-intrinsic" {
     /// Gets a reference to a static `Location` indicating where it was called.
     ///
     /// Consider using [`crate::panic::Location::caller`] instead.
-    #[rustc_const_unstable(feature = "const_caller_location", issue = "47809")]
+    #[rustc_const_unstable(feature = "const_caller_location", issue = "76156")]
     pub fn caller_location() -> &'static crate::panic::Location<'static>;
 
     /// Moves a value out of scope without running drop glue.
diff --git a/library/core/src/iter/adapters/mod.rs b/library/core/src/iter/adapters/mod.rs
index c3f1269401aa9..b411222856edb 100644
--- a/library/core/src/iter/adapters/mod.rs
+++ b/library/core/src/iter/adapters/mod.rs
@@ -1273,7 +1273,7 @@ where
         ) -> impl FnMut((), T) -> ControlFlow<(), B> + '_ {
             move |(), x| match f(x) {
                 Some(x) => ControlFlow::Break(x),
-                None => ControlFlow::Continue(()),
+                None => ControlFlow::CONTINUE,
             }
         }
 
@@ -1772,7 +1772,7 @@ impl<I: Iterator> Peekable<I> {
         self.peeked.get_or_insert_with(|| iter.next()).as_ref()
     }
 
-    /// Consume the next value of this iterator if a condition is true.
+    /// Consume and return the next value of this iterator if a condition is true.
     ///
     /// If `func` returns `true` for the next value of this iterator, consume and return it.
     /// Otherwise, return `None`.
@@ -1812,7 +1812,7 @@ impl<I: Iterator> Peekable<I> {
         }
     }
 
-    /// Consume the next item if it is equal to `expected`.
+    /// Consume and return the next item if it is equal to `expected`.
     ///
     /// # Example
     /// Consume a number if it's equal to 0.
@@ -1827,10 +1827,10 @@ impl<I: Iterator> Peekable<I> {
     /// assert_eq!(iter.next(), Some(1));
     /// ```
     #[unstable(feature = "peekable_next_if", issue = "72480")]
-    pub fn next_if_eq<R>(&mut self, expected: &R) -> Option<I::Item>
+    pub fn next_if_eq<T>(&mut self, expected: &T) -> Option<I::Item>
     where
-        R: ?Sized,
-        I::Item: PartialEq<R>,
+        T: ?Sized,
+        I::Item: PartialEq<T>,
     {
         self.next_if(|next| next == expected)
     }
diff --git a/library/core/src/iter/traits/double_ended.rs b/library/core/src/iter/traits/double_ended.rs
index f50807116bd09..a025bc8b56049 100644
--- a/library/core/src/iter/traits/double_ended.rs
+++ b/library/core/src/iter/traits/double_ended.rs
@@ -310,7 +310,7 @@ pub trait DoubleEndedIterator: Iterator {
             mut predicate: impl FnMut(&T) -> bool,
         ) -> impl FnMut((), T) -> ControlFlow<(), T> {
             move |(), x| {
-                if predicate(&x) { ControlFlow::Break(x) } else { ControlFlow::Continue(()) }
+                if predicate(&x) { ControlFlow::Break(x) } else { ControlFlow::CONTINUE }
             }
         }
 
diff --git a/library/core/src/iter/traits/iterator.rs b/library/core/src/iter/traits/iterator.rs
index 46ef12cd938b3..b8a09f822b6da 100644
--- a/library/core/src/iter/traits/iterator.rs
+++ b/library/core/src/iter/traits/iterator.rs
@@ -648,11 +648,9 @@ pub trait Iterator {
     /// Creates an iterator which uses a closure to determine if an element
     /// should be yielded.
     ///
-    /// The closure must return `true` or `false`. `filter()` creates an
-    /// iterator which calls this closure on each element. If the closure
-    /// returns `true`, then the element is returned. If the closure returns
-    /// `false`, it will try again, and call the closure on the next element,
-    /// seeing if it passes the test.
+    /// Given an element the closure must return `true` or `false`. The returned
+    /// iterator will yield only the elements for which the closure returns
+    /// true.
     ///
     /// # Examples
     ///
@@ -719,24 +717,16 @@ pub trait Iterator {
 
     /// Creates an iterator that both filters and maps.
     ///
-    /// The closure must return an [`Option<T>`]. `filter_map` creates an
-    /// iterator which calls this closure on each element. If the closure
-    /// returns [`Some(element)`][`Some`], then that element is returned. If the
-    /// closure returns [`None`], it will try again, and call the closure on the
-    /// next element, seeing if it will return [`Some`].
+    /// The returned iterator yields only the `value`s for which the supplied
+    /// closure returns `Some(value)`.
     ///
-    /// Why `filter_map` and not just [`filter`] and [`map`]? The key is in this
-    /// part:
+    /// `filter_map` can be used to make chains of [`filter`] and [`map`] more
+    /// concise. The example below shows how a `map().filter().map()` can be
+    /// shortened to a single call to `filter_map`.
     ///
     /// [`filter`]: Iterator::filter
     /// [`map`]: Iterator::map
     ///
-    /// > If the closure returns [`Some(element)`][`Some`], then that element is returned.
-    ///
-    /// In other words, it removes the [`Option<T>`] layer automatically. If your
-    /// mapping is already returning an [`Option<T>`] and you want to skip over
-    /// [`None`]s, then `filter_map` is much, much nicer to use.
-    ///
     /// # Examples
     ///
     /// Basic usage:
@@ -819,7 +809,7 @@ pub trait Iterator {
         Enumerate::new(self)
     }
 
-    /// Creates an iterator which can use `peek` to look at the next element of
+    /// Creates an iterator which can use [`peek`] to look at the next element of
     /// the iterator without consuming it.
     ///
     /// Adds a [`peek`] method to an iterator. See its documentation for
@@ -2002,7 +1992,7 @@ pub trait Iterator {
 
     /// The same as [`fold()`], but uses the first element in the
     /// iterator as the initial value, folding every subsequent element into it.
-    /// If the iterator is empty, return `None`; otherwise, return the result
+    /// If the iterator is empty, return [`None`]; otherwise, return the result
     /// of the fold.
     ///
     /// [`fold()`]: Iterator::fold
@@ -2086,10 +2076,10 @@ pub trait Iterator {
         #[inline]
         fn check<T>(mut f: impl FnMut(T) -> bool) -> impl FnMut((), T) -> ControlFlow<(), ()> {
             move |(), x| {
-                if f(x) { ControlFlow::Continue(()) } else { ControlFlow::Break(()) }
+                if f(x) { ControlFlow::CONTINUE } else { ControlFlow::BREAK }
             }
         }
-        self.try_fold((), check(f)) == ControlFlow::Continue(())
+        self.try_fold((), check(f)) == ControlFlow::CONTINUE
     }
 
     /// Tests if any element of the iterator matches a predicate.
@@ -2139,11 +2129,11 @@ pub trait Iterator {
         #[inline]
         fn check<T>(mut f: impl FnMut(T) -> bool) -> impl FnMut((), T) -> ControlFlow<(), ()> {
             move |(), x| {
-                if f(x) { ControlFlow::Break(()) } else { ControlFlow::Continue(()) }
+                if f(x) { ControlFlow::BREAK } else { ControlFlow::CONTINUE }
             }
         }
 
-        self.try_fold((), check(f)) == ControlFlow::Break(())
+        self.try_fold((), check(f)) == ControlFlow::BREAK
     }
 
     /// Searches for an element of an iterator that satisfies a predicate.
@@ -2201,7 +2191,7 @@ pub trait Iterator {
             mut predicate: impl FnMut(&T) -> bool,
         ) -> impl FnMut((), T) -> ControlFlow<(), T> {
             move |(), x| {
-                if predicate(&x) { ControlFlow::Break(x) } else { ControlFlow::Continue(()) }
+                if predicate(&x) { ControlFlow::Break(x) } else { ControlFlow::CONTINUE }
             }
         }
 
@@ -2236,7 +2226,7 @@ pub trait Iterator {
         ) -> impl FnMut((), T) -> ControlFlow<(), B> {
             move |(), x| match f(x) {
                 Some(x) => ControlFlow::Break(x),
-                None => ControlFlow::Continue(()),
+                None => ControlFlow::CONTINUE,
             }
         }
 
@@ -2278,7 +2268,7 @@ pub trait Iterator {
             R: Try<Ok = bool>,
         {
             move |(), x| match f(&x).into_result() {
-                Ok(false) => ControlFlow::Continue(()),
+                Ok(false) => ControlFlow::CONTINUE,
                 Ok(true) => ControlFlow::Break(Ok(x)),
                 Err(x) => ControlFlow::Break(Err(x)),
             }
@@ -2831,7 +2821,7 @@ pub trait Iterator {
         Product::product(self)
     }
 
-    /// Lexicographically compares the elements of this `Iterator` with those
+    /// Lexicographically compares the elements of this [`Iterator`] with those
     /// of another.
     ///
     /// # Examples
@@ -2853,7 +2843,7 @@ pub trait Iterator {
         self.cmp_by(other, |x, y| x.cmp(&y))
     }
 
-    /// Lexicographically compares the elements of this `Iterator` with those
+    /// Lexicographically compares the elements of this [`Iterator`] with those
     /// of another with respect to the specified comparison function.
     ///
     /// # Examples
@@ -2905,7 +2895,7 @@ pub trait Iterator {
         }
     }
 
-    /// Lexicographically compares the elements of this `Iterator` with those
+    /// Lexicographically compares the elements of this [`Iterator`] with those
     /// of another.
     ///
     /// # Examples
@@ -2929,7 +2919,7 @@ pub trait Iterator {
         self.partial_cmp_by(other, |x, y| x.partial_cmp(&y))
     }
 
-    /// Lexicographically compares the elements of this `Iterator` with those
+    /// Lexicographically compares the elements of this [`Iterator`] with those
     /// of another with respect to the specified comparison function.
     ///
     /// # Examples
@@ -2990,7 +2980,7 @@ pub trait Iterator {
         }
     }
 
-    /// Determines if the elements of this `Iterator` are equal to those of
+    /// Determines if the elements of this [`Iterator`] are equal to those of
     /// another.
     ///
     /// # Examples
@@ -3009,7 +2999,7 @@ pub trait Iterator {
         self.eq_by(other, |x, y| x == y)
     }
 
-    /// Determines if the elements of this `Iterator` are equal to those of
+    /// Determines if the elements of this [`Iterator`] are equal to those of
     /// another with respect to the specified equality function.
     ///
     /// # Examples
@@ -3050,7 +3040,7 @@ pub trait Iterator {
         }
     }
 
-    /// Determines if the elements of this `Iterator` are unequal to those of
+    /// Determines if the elements of this [`Iterator`] are unequal to those of
     /// another.
     ///
     /// # Examples
@@ -3069,7 +3059,7 @@ pub trait Iterator {
         !self.eq(other)
     }
 
-    /// Determines if the elements of this `Iterator` are lexicographically
+    /// Determines if the elements of this [`Iterator`] are lexicographically
     /// less than those of another.
     ///
     /// # Examples
@@ -3090,7 +3080,7 @@ pub trait Iterator {
         self.partial_cmp(other) == Some(Ordering::Less)
     }
 
-    /// Determines if the elements of this `Iterator` are lexicographically
+    /// Determines if the elements of this [`Iterator`] are lexicographically
     /// less or equal to those of another.
     ///
     /// # Examples
@@ -3111,7 +3101,7 @@ pub trait Iterator {
         matches!(self.partial_cmp(other), Some(Ordering::Less | Ordering::Equal))
     }
 
-    /// Determines if the elements of this `Iterator` are lexicographically
+    /// Determines if the elements of this [`Iterator`] are lexicographically
     /// greater than those of another.
     ///
     /// # Examples
@@ -3132,7 +3122,7 @@ pub trait Iterator {
         self.partial_cmp(other) == Some(Ordering::Greater)
     }
 
-    /// Determines if the elements of this `Iterator` are lexicographically
+    /// Determines if the elements of this [`Iterator`] are lexicographically
     /// greater than or equal to those of another.
     ///
     /// # Examples
diff --git a/library/core/src/ops/control_flow.rs b/library/core/src/ops/control_flow.rs
index 687d423dcb635..b0c7dc1a51875 100644
--- a/library/core/src/ops/control_flow.rs
+++ b/library/core/src/ops/control_flow.rs
@@ -65,3 +65,46 @@ impl<R: Try> ControlFlow<R::Ok, R> {
         }
     }
 }
+
+impl<B> ControlFlow<(), B> {
+    /// It's frequently the case that there's no value needed with `Continue`,
+    /// so this provides a way to avoid typing `(())`, if you prefer it.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(control_flow_enum)]
+    /// use std::ops::ControlFlow;
+    ///
+    /// let mut partial_sum = 0;
+    /// let last_used = (1..10).chain(20..25).try_for_each(|x| {
+    ///     partial_sum += x;
+    ///     if partial_sum > 100 { ControlFlow::Break(x) }
+    ///     else { ControlFlow::CONTINUE }
+    /// });
+    /// assert_eq!(last_used.break_value(), Some(22));
+    /// ```
+    #[unstable(feature = "control_flow_enum", reason = "new API", issue = "75744")]
+    pub const CONTINUE: Self = ControlFlow::Continue(());
+}
+
+impl<C> ControlFlow<C, ()> {
+    /// APIs like `try_for_each` don't need values with `Break`,
+    /// so this provides a way to avoid typing `(())`, if you prefer it.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(control_flow_enum)]
+    /// use std::ops::ControlFlow;
+    ///
+    /// let mut partial_sum = 0;
+    /// (1..10).chain(20..25).try_for_each(|x| {
+    ///     if partial_sum > 100 { ControlFlow::BREAK }
+    ///     else { partial_sum += x; ControlFlow::CONTINUE }
+    /// });
+    /// assert_eq!(partial_sum, 108);
+    /// ```
+    #[unstable(feature = "control_flow_enum", reason = "new API", issue = "75744")]
+    pub const BREAK: Self = ControlFlow::Break(());
+}
diff --git a/library/core/src/panic.rs b/library/core/src/panic.rs
index 25ee73c626eac..34a974b827158 100644
--- a/library/core/src/panic.rs
+++ b/library/core/src/panic.rs
@@ -225,7 +225,7 @@ impl<'a> Location<'a> {
     /// assert_ne!(this_location.column(), another_location.column());
     /// ```
     #[stable(feature = "track_caller", since = "1.46.0")]
-    #[rustc_const_unstable(feature = "const_caller_location", issue = "47809")]
+    #[rustc_const_unstable(feature = "const_caller_location", issue = "76156")]
     #[track_caller]
     pub const fn caller() -> &'static Location<'static> {
         crate::intrinsics::caller_location()
diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
index 68977a983aa37..aa9ad395b1840 100644
--- a/library/core/src/slice/mod.rs
+++ b/library/core/src/slice/mod.rs
@@ -66,7 +66,6 @@ impl<T> [T] {
     #[rustc_const_stable(feature = "const_slice_len", since = "1.32.0")]
     #[inline]
     // SAFETY: const sound because we transmute out the length field as a usize (which it must be)
-    #[allow(unused_attributes)]
     #[allow_internal_unstable(const_fn_union)]
     pub const fn len(&self) -> usize {
         // SAFETY: this is safe because `&[T]` and `FatPtr<T>` have the same layout.
@@ -3358,8 +3357,9 @@ mod private_slice_index {
     on(T = "str", label = "string indices are ranges of `usize`",),
     on(
         all(any(T = "str", T = "&str", T = "std::string::String"), _Self = "{integer}"),
-        note = "you can use `.chars().nth()` or `.bytes().nth()`
-see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>"
+        note = "you can use `.chars().nth()` or `.bytes().nth()`\n\
+                for more information, see chapter 8 in The Book: \
+                <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>"
     ),
     message = "the type `{T}` cannot be indexed by `{Self}`",
     label = "slice indices are of type `usize` or ranges of `usize`"
diff --git a/library/core/src/sync/atomic.rs b/library/core/src/sync/atomic.rs
index 38eabaaa396e0..cda652c6ea791 100644
--- a/library/core/src/sync/atomic.rs
+++ b/library/core/src/sync/atomic.rs
@@ -110,6 +110,7 @@ use self::Ordering::*;
 use crate::cell::UnsafeCell;
 use crate::fmt;
 use crate::intrinsics;
+use crate::mem::align_of;
 
 use crate::hint::spin_loop;
 
@@ -327,6 +328,27 @@ impl AtomicBool {
         unsafe { &mut *(self.v.get() as *mut bool) }
     }
 
+    /// Get atomic access to a `&mut bool`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(atomic_from_mut)]
+    /// use std::sync::atomic::{AtomicBool, Ordering};
+    ///
+    /// let mut some_bool = true;
+    /// let a = AtomicBool::from_mut(&mut some_bool);
+    /// a.store(false, Ordering::Relaxed);
+    /// assert_eq!(some_bool, false);
+    /// ```
+    #[inline]
+    #[unstable(feature = "atomic_from_mut", issue = "76314")]
+    pub fn from_mut(v: &mut bool) -> &Self {
+        // SAFETY: the mutable reference guarantees unique ownership, and
+        // alignment of both `bool` and `Self` is 1.
+        unsafe { &*(v as *mut bool as *mut Self) }
+    }
+
     /// Consumes the atomic and returns the contained value.
     ///
     /// This is safe because passing `self` by value guarantees that no other threads are
@@ -820,6 +842,30 @@ impl<T> AtomicPtr<T> {
         unsafe { &mut *self.p.get() }
     }
 
+    /// Get atomic access to a pointer.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(atomic_from_mut)]
+    /// use std::sync::atomic::{AtomicPtr, Ordering};
+    ///
+    /// let mut some_ptr = &mut 123 as *mut i32;
+    /// let a = AtomicPtr::from_mut(&mut some_ptr);
+    /// a.store(&mut 456, Ordering::Relaxed);
+    /// assert_eq!(unsafe { *some_ptr }, 456);
+    /// ```
+    #[inline]
+    #[unstable(feature = "atomic_from_mut", issue = "76314")]
+    pub fn from_mut(v: &mut *mut T) -> &Self {
+        let [] = [(); align_of::<Self>() - align_of::<*mut T>()];
+        // SAFETY:
+        //  - the mutable reference guarantees unique ownership.
+        //  - the alignment of `*mut T` and `Self` is the same on all platforms
+        //    supported by rust, as verified above.
+        unsafe { &*(v as *mut *mut T as *mut Self) }
+    }
+
     /// Consumes the atomic and returns the contained value.
     ///
     /// This is safe because passing `self` by value guarantees that no other threads are
@@ -1104,6 +1150,12 @@ impl<T> From<*mut T> for AtomicPtr<T> {
     }
 }
 
+macro_rules! if_not_8_bit {
+    (u8, $($tt:tt)*) => { "" };
+    (i8, $($tt:tt)*) => { "" };
+    ($_:ident, $($tt:tt)*) => { $($tt)* };
+}
+
 #[cfg(target_has_atomic_load_store = "8")]
 macro_rules! atomic_int {
     ($cfg_cas:meta,
@@ -1115,7 +1167,8 @@ macro_rules! atomic_int {
      $stable_nand:meta,
      $const_stable:meta,
      $stable_init_const:meta,
-     $s_int_type:expr, $int_ref:expr,
+     $(from_mut: cfg($from_mut_cfg:meta),)?
+     $s_int_type:literal, $int_ref:expr,
      $extra_feature:expr,
      $min_fn:ident, $max_fn:ident,
      $align:expr,
@@ -1226,6 +1279,45 @@ assert_eq!(some_var.load(Ordering::SeqCst), 5);
                 }
             }
 
+            doc_comment! {
+                concat!("Get atomic access to a `&mut ", stringify!($int_type), "`.
+
+",
+if_not_8_bit! {
+    $int_type,
+    concat!(
+        "**Note:** This function is only available on targets where `",
+        stringify!($int_type), "` has an alignment of ", $align, " bytes."
+    )
+},
+"
+
+# Examples
+
+```
+#![feature(atomic_from_mut)]
+", $extra_feature, "use std::sync::atomic::{", stringify!($atomic_type), ", Ordering};
+
+let mut some_int = 123;
+let a = ", stringify!($atomic_type), "::from_mut(&mut some_int);
+a.store(100, Ordering::Relaxed);
+assert_eq!(some_int, 100);
+```
+                "),
+                #[inline]
+                $(#[cfg($from_mut_cfg)])?
+                #[unstable(feature = "atomic_from_mut", issue = "76314")]
+                pub fn from_mut(v: &mut $int_type) -> &Self {
+                    let [] = [(); align_of::<Self>() - align_of::<$int_type>()];
+                    // SAFETY:
+                    //  - the mutable reference guarantees unique ownership.
+                    //  - the alignment of `$int_type` and `Self` is the
+                    //    same on all platforms enabled by `$from_mut_cfg`
+                    //    as verified above.
+                    unsafe { &*(v as *mut $int_type as *mut Self) }
+                }
+            }
+
             doc_comment! {
                 concat!("Consumes the atomic and returns the contained value.
 
@@ -1984,6 +2076,7 @@ atomic_int! {
     stable(feature = "integer_atomics_stable", since = "1.34.0"),
     rustc_const_stable(feature = "const_integer_atomics", since = "1.34.0"),
     unstable(feature = "integer_atomics", issue = "32976"),
+    from_mut: cfg(not(target_arch = "x86")),
     "i64", "../../../std/primitive.i64.html",
     "",
     atomic_min, atomic_max,
@@ -2002,6 +2095,7 @@ atomic_int! {
     stable(feature = "integer_atomics_stable", since = "1.34.0"),
     rustc_const_stable(feature = "const_integer_atomics", since = "1.34.0"),
     unstable(feature = "integer_atomics", issue = "32976"),
+    from_mut: cfg(not(target_arch = "x86")),
     "u64", "../../../std/primitive.u64.html",
     "",
     atomic_umin, atomic_umax,
diff --git a/library/core/tests/ascii.rs b/library/core/tests/ascii.rs
index 0b97508394789..3244bbc2d670d 100644
--- a/library/core/tests/ascii.rs
+++ b/library/core/tests/ascii.rs
@@ -397,3 +397,14 @@ fn test_is_ascii_align_size_thoroughly() {
         }
     }
 }
+
+#[test]
+fn ascii_const() {
+    // test that the `is_ascii` methods of `char` and `u8` are usable in a const context
+
+    const CHAR_IS_ASCII: bool = 'a'.is_ascii();
+    assert!(CHAR_IS_ASCII);
+
+    const BYTE_IS_ASCII: bool = 97u8.is_ascii();
+    assert!(BYTE_IS_ASCII);
+}
diff --git a/library/core/tests/nonzero.rs b/library/core/tests/nonzero.rs
index 48aec6d718d3d..825e5e63b59bc 100644
--- a/library/core/tests/nonzero.rs
+++ b/library/core/tests/nonzero.rs
@@ -195,3 +195,20 @@ fn test_nonzero_from_int_on_err() {
     assert!(NonZeroI8::try_from(0).is_err());
     assert!(NonZeroI32::try_from(0).is_err());
 }
+
+#[test]
+fn nonzero_const() {
+    // test that the methods of `NonZeroX>` are usable in a const context
+    // Note: only tests NonZero8
+
+    const NONZERO: NonZeroU8 = unsafe { NonZeroU8::new_unchecked(5) };
+
+    const GET: u8 = NONZERO.get();
+    assert_eq!(GET, 5);
+
+    const ZERO: Option<NonZeroU8> = NonZeroU8::new(0);
+    assert!(ZERO.is_none());
+
+    const ONE: Option<NonZeroU8> = NonZeroU8::new(1);
+    assert!(ONE.is_some());
+}
diff --git a/library/std/src/net/ip/tests.rs b/library/std/src/net/ip/tests.rs
index a2fba4b4cca95..76a0ae8b9454d 100644
--- a/library/std/src/net/ip/tests.rs
+++ b/library/std/src/net/ip/tests.rs
@@ -809,3 +809,112 @@ fn is_v6() {
     assert!(!ip.is_ipv4());
     assert!(ip.is_ipv6());
 }
+
+#[test]
+fn ipv4_const() {
+    // test that the methods of `Ipv4Addr` are usable in a const context
+
+    const IP_ADDRESS: Ipv4Addr = Ipv4Addr::new(127, 0, 0, 1);
+    assert_eq!(IP_ADDRESS, Ipv4Addr::LOCALHOST);
+
+    const OCTETS: [u8; 4] = IP_ADDRESS.octets();
+    assert_eq!(OCTETS, [127, 0, 0, 1]);
+
+    const IS_UNSPECIFIED: bool = IP_ADDRESS.is_unspecified();
+    assert!(!IS_UNSPECIFIED);
+
+    const IS_LOOPBACK: bool = IP_ADDRESS.is_loopback();
+    assert!(IS_LOOPBACK);
+
+    const IS_PRIVATE: bool = IP_ADDRESS.is_private();
+    assert!(!IS_PRIVATE);
+
+    const IS_LINK_LOCAL: bool = IP_ADDRESS.is_link_local();
+    assert!(!IS_LINK_LOCAL);
+
+    const IS_GLOBAL: bool = IP_ADDRESS.is_global();
+    assert!(!IS_GLOBAL);
+
+    const IS_SHARED: bool = IP_ADDRESS.is_shared();
+    assert!(!IS_SHARED);
+
+    const IS_IETF_PROTOCOL_ASSIGNMENT: bool = IP_ADDRESS.is_ietf_protocol_assignment();
+    assert!(!IS_IETF_PROTOCOL_ASSIGNMENT);
+
+    const IS_BENCHMARKING: bool = IP_ADDRESS.is_benchmarking();
+    assert!(!IS_BENCHMARKING);
+
+    const IS_RESERVED: bool = IP_ADDRESS.is_reserved();
+    assert!(!IS_RESERVED);
+
+    const IS_MULTICAST: bool = IP_ADDRESS.is_multicast();
+    assert!(!IS_MULTICAST);
+
+    const IS_BROADCAST: bool = IP_ADDRESS.is_broadcast();
+    assert!(!IS_BROADCAST);
+
+    const IS_DOCUMENTATION: bool = IP_ADDRESS.is_documentation();
+    assert!(!IS_DOCUMENTATION);
+
+    const IP_V6_COMPATIBLE: Ipv6Addr = IP_ADDRESS.to_ipv6_compatible();
+    assert_eq!(
+        IP_V6_COMPATIBLE,
+        Ipv6Addr::from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 127, 0, 0, 1])
+    );
+
+    const IP_V6_MAPPED: Ipv6Addr = IP_ADDRESS.to_ipv6_mapped();
+    assert_eq!(
+        IP_V6_MAPPED,
+        Ipv6Addr::from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 127, 0, 0, 1])
+    );
+}
+
+#[test]
+fn ipv6_const() {
+    // test that the methods of `Ipv6Addr` are usable in a const context
+
+    const IP_ADDRESS: Ipv6Addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
+    assert_eq!(IP_ADDRESS, Ipv6Addr::LOCALHOST);
+
+    const SEGMENTS: [u16; 8] = IP_ADDRESS.segments();
+    assert_eq!(SEGMENTS, [0, 0, 0, 0, 0, 0, 0, 1]);
+
+    const OCTETS: [u8; 16] = IP_ADDRESS.octets();
+    assert_eq!(OCTETS, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]);
+
+    const IS_UNSPECIFIED: bool = IP_ADDRESS.is_unspecified();
+    assert!(!IS_UNSPECIFIED);
+
+    const IS_LOOPBACK: bool = IP_ADDRESS.is_loopback();
+    assert!(IS_LOOPBACK);
+
+    const IS_GLOBAL: bool = IP_ADDRESS.is_global();
+    assert!(!IS_GLOBAL);
+
+    const IS_UNIQUE_LOCAL: bool = IP_ADDRESS.is_unique_local();
+    assert!(!IS_UNIQUE_LOCAL);
+
+    const IS_UNICAST_LINK_LOCAL_STRICT: bool = IP_ADDRESS.is_unicast_link_local_strict();
+    assert!(!IS_UNICAST_LINK_LOCAL_STRICT);
+
+    const IS_UNICAST_LINK_LOCAL: bool = IP_ADDRESS.is_unicast_link_local();
+    assert!(!IS_UNICAST_LINK_LOCAL);
+
+    const IS_UNICAST_SITE_LOCAL: bool = IP_ADDRESS.is_unicast_site_local();
+    assert!(!IS_UNICAST_SITE_LOCAL);
+
+    const IS_DOCUMENTATION: bool = IP_ADDRESS.is_documentation();
+    assert!(!IS_DOCUMENTATION);
+
+    const IS_UNICAST_GLOBAL: bool = IP_ADDRESS.is_unicast_global();
+    assert!(!IS_UNICAST_GLOBAL);
+
+    const MULTICAST_SCOPE: Option<Ipv6MulticastScope> = IP_ADDRESS.multicast_scope();
+    assert_eq!(MULTICAST_SCOPE, None);
+
+    const IS_MULTICAST: bool = IP_ADDRESS.is_multicast();
+    assert!(!IS_MULTICAST);
+
+    const IP_V4: Option<Ipv4Addr> = IP_ADDRESS.to_ipv4();
+    assert_eq!(IP_V4.unwrap(), Ipv4Addr::new(0, 0, 0, 1));
+}
diff --git a/library/std/src/os/raw/mod.rs b/library/std/src/os/raw/mod.rs
index 1fe27a3460000..83e8853fe7923 100644
--- a/library/std/src/os/raw/mod.rs
+++ b/library/std/src/os/raw/mod.rs
@@ -9,7 +9,6 @@
 #![stable(feature = "raw_os", since = "1.1.0")]
 
 #[cfg(test)]
-#[allow(unused_imports)]
 mod tests;
 
 #[doc(include = "char.md")]
diff --git a/library/std/src/os/raw/tests.rs b/library/std/src/os/raw/tests.rs
index e808faf81d657..e7bb7d7e73e80 100644
--- a/library/std/src/os/raw/tests.rs
+++ b/library/std/src/os/raw/tests.rs
@@ -1,5 +1,4 @@
 use crate::any::TypeId;
-use crate::mem;
 
 macro_rules! ok {
     ($($t:ident)*) => {$(
diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 73c0a7b403a7b..575882eb459fc 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -159,7 +159,7 @@ pub struct Instant(time::Instant);
 /// | CloudABI  | [clock_time_get (Realtime Clock)]                                    |
 /// | SGX       | [`insecure_time` usercall]. More information on [timekeeping in SGX] |
 /// | UNIX      | [clock_gettime (Realtime Clock)]                                     |
-/// | DARWIN    | [gettimeofday]                                                       |
+/// | Darwin    | [gettimeofday]                                                       |
 /// | VXWorks   | [clock_gettime (Realtime Clock)]                                     |
 /// | WASI      | [__wasi_clock_time_get (Realtime Clock)]                             |
 /// | Windows   | [GetSystemTimePreciseAsFileTime] / [GetSystemTimeAsFileTime]         |
diff --git a/src/test/debuginfo/pretty-std-collections-hash.rs b/src/test/debuginfo/pretty-std-collections-hash.rs
index e8f52deabd809..9f59936a92d10 100644
--- a/src/test/debuginfo/pretty-std-collections-hash.rs
+++ b/src/test/debuginfo/pretty-std-collections-hash.rs
@@ -1,3 +1,7 @@
+// CDB doesn't like how libstd.natvis casts to tuples before this version.
+// https://github.com/rust-lang/rust/issues/76352#issuecomment-687640746
+// min-cdb-version: 10.0.18362.1
+
 // cdb-only
 // compile-flags:-g
 
diff --git a/src/test/ui/array-slice-vec/slice-2.rs b/src/test/ui/array-slice-vec/slice-2.rs
deleted file mode 100644
index 01733f48234f9..0000000000000
--- a/src/test/ui/array-slice-vec/slice-2.rs
+++ /dev/null
@@ -1,62 +0,0 @@
-// run-pass
-
-// Test slicing expressions on slices and Vecs.
-
-
-fn main() {
-    let x: &[isize] = &[1, 2, 3, 4, 5];
-    let cmp: &[isize] = &[1, 2, 3, 4, 5];
-    assert_eq!(&x[..], cmp);
-    let cmp: &[isize] = &[3, 4, 5];
-    assert_eq!(&x[2..], cmp);
-    let cmp: &[isize] = &[1, 2, 3];
-    assert_eq!(&x[..3], cmp);
-    let cmp: &[isize] = &[2, 3, 4];
-    assert_eq!(&x[1..4], cmp);
-
-    let x: Vec<isize> = vec![1, 2, 3, 4, 5];
-    let cmp: &[isize] = &[1, 2, 3, 4, 5];
-    assert_eq!(&x[..], cmp);
-    let cmp: &[isize] = &[3, 4, 5];
-    assert_eq!(&x[2..], cmp);
-    let cmp: &[isize] = &[1, 2, 3];
-    assert_eq!(&x[..3], cmp);
-    let cmp: &[isize] = &[2, 3, 4];
-    assert_eq!(&x[1..4], cmp);
-
-    let x: &mut [isize] = &mut [1, 2, 3, 4, 5];
-    {
-        let cmp: &mut [isize] = &mut [1, 2, 3, 4, 5];
-        assert_eq!(&mut x[..], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [3, 4, 5];
-        assert_eq!(&mut x[2..], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [1, 2, 3];
-        assert_eq!(&mut x[..3], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [2, 3, 4];
-        assert_eq!(&mut x[1..4], cmp);
-    }
-
-    let mut x: Vec<isize> = vec![1, 2, 3, 4, 5];
-    {
-        let cmp: &mut [isize] = &mut [1, 2, 3, 4, 5];
-        assert_eq!(&mut x[..], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [3, 4, 5];
-        assert_eq!(&mut x[2..], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [1, 2, 3];
-        assert_eq!(&mut x[..3], cmp);
-    }
-    {
-        let cmp: &mut [isize] = &mut [2, 3, 4];
-        assert_eq!(&mut x[1..4], cmp);
-    }
-}
diff --git a/src/test/ui/array-slice-vec/vec-concat.rs b/src/test/ui/array-slice-vec/vec-concat.rs
deleted file mode 100644
index 1f493679b7947..0000000000000
--- a/src/test/ui/array-slice-vec/vec-concat.rs
+++ /dev/null
@@ -1,14 +0,0 @@
-// run-pass
-
-use std::vec;
-
-pub fn main() {
-    let a: Vec<isize> = vec![1, 2, 3, 4, 5];
-    let b: Vec<isize> = vec![6, 7, 8, 9, 0];
-    let mut v: Vec<isize> = a;
-    v.extend_from_slice(&b);
-    println!("{}", v[9]);
-    assert_eq!(v[0], 1);
-    assert_eq!(v[7], 8);
-    assert_eq!(v[9], 0);
-}
diff --git a/src/test/ui/array-slice-vec/vec-growth.rs b/src/test/ui/array-slice-vec/vec-growth.rs
deleted file mode 100644
index b09f08bb85a82..0000000000000
--- a/src/test/ui/array-slice-vec/vec-growth.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-// run-pass
-
-
-
-pub fn main() {
-    let mut v = vec![1];
-    v.push(2);
-    v.push(3);
-    v.push(4);
-    v.push(5);
-    assert_eq!(v[0], 1);
-    assert_eq!(v[1], 2);
-    assert_eq!(v[2], 3);
-    assert_eq!(v[3], 4);
-    assert_eq!(v[4], 5);
-}
diff --git a/src/test/ui/array-slice-vec/vec-push.rs b/src/test/ui/array-slice-vec/vec-push.rs
deleted file mode 100644
index 466ab3fab1cab..0000000000000
--- a/src/test/ui/array-slice-vec/vec-push.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-// run-pass
-
-pub fn main() { let mut v = vec![1, 2, 3]; v.push(1); }
diff --git a/src/test/ui/array-slice-vec/vec-slice.rs b/src/test/ui/array-slice-vec/vec-slice.rs
deleted file mode 100644
index 1f090ddd9c97d..0000000000000
--- a/src/test/ui/array-slice-vec/vec-slice.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-// run-pass
-
-
-pub fn main() {
-    let  v = vec![1,2,3,4,5];
-    let v2 = &v[1..3];
-    assert_eq!(v2[0], 2);
-    assert_eq!(v2[1], 3);
-}
diff --git a/src/test/ui/array-slice-vec/vec-to_str.rs b/src/test/ui/array-slice-vec/vec-to_str.rs
deleted file mode 100644
index a11cfc8e9b5c9..0000000000000
--- a/src/test/ui/array-slice-vec/vec-to_str.rs
+++ /dev/null
@@ -1,12 +0,0 @@
-// run-pass
-
-
-pub fn main() {
-    assert_eq!(format!("{:?}", vec![0, 1]), "[0, 1]".to_string());
-
-    let foo = vec![3, 4];
-    let bar: &[isize] = &[4, 5];
-
-    assert_eq!(format!("{:?}", foo), "[3, 4]");
-    assert_eq!(format!("{:?}", bar), "[4, 5]");
-}
diff --git a/src/test/ui/array-slice-vec/vec.rs b/src/test/ui/array-slice-vec/vec.rs
deleted file mode 100644
index e76c1ab440e6e..0000000000000
--- a/src/test/ui/array-slice-vec/vec.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// run-pass
-
-
-
-pub fn main() {
-    let v: Vec<isize> = vec![10, 20];
-    assert_eq!(v[0], 10);
-    assert_eq!(v[1], 20);
-    let mut x: usize = 0;
-    assert_eq!(v[x], 10);
-    assert_eq!(v[x + 1], 20);
-    x = x + 1;
-    assert_eq!(v[x], 20);
-    assert_eq!(v[x - 1], 10);
-}
diff --git a/src/test/ui/const-generics/min-and-full-same-time.rs b/src/test/ui/const-generics/min-and-full-same-time.rs
new file mode 100644
index 0000000000000..2365adc3a861f
--- /dev/null
+++ b/src/test/ui/const-generics/min-and-full-same-time.rs
@@ -0,0 +1,7 @@
+#![feature(const_generics)]
+//~^ ERROR features `const_generics` and `min_const_generics` are incompatible
+#![allow(incomplete_features)]
+#![feature(min_const_generics)]
+
+
+fn main() {}
diff --git a/src/test/ui/const-generics/min-and-full-same-time.stderr b/src/test/ui/const-generics/min-and-full-same-time.stderr
new file mode 100644
index 0000000000000..907fec9bbe17a
--- /dev/null
+++ b/src/test/ui/const-generics/min-and-full-same-time.stderr
@@ -0,0 +1,13 @@
+error: features `const_generics` and `min_const_generics` are incompatible, using them at the same time is not allowed
+  --> $DIR/min-and-full-same-time.rs:1:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+...
+LL | #![feature(min_const_generics)]
+   |            ^^^^^^^^^^^^^^^^^^
+   |
+   = help: remove one of these features
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/consts/const-nonzero.rs b/src/test/ui/consts/const-nonzero.rs
deleted file mode 100644
index cf6f8c8d69a26..0000000000000
--- a/src/test/ui/consts/const-nonzero.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-// run-pass
-
-use std::num::NonZeroU8;
-
-const X: NonZeroU8 = unsafe { NonZeroU8::new_unchecked(5) };
-const Y: u8 = X.get();
-
-const ZERO: Option<NonZeroU8> = NonZeroU8::new(0);
-const ONE: Option<NonZeroU8> = NonZeroU8::new(1);
-
-fn main() {
-    assert_eq!(Y, 5);
-
-    assert!(ZERO.is_none());
-    assert_eq!(ONE.unwrap().get(), 1);
-}
diff --git a/src/test/ui/consts/cow-is-borrowed.rs b/src/test/ui/consts/cow-is-borrowed.rs
deleted file mode 100644
index adebe20f5a255..0000000000000
--- a/src/test/ui/consts/cow-is-borrowed.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// run-pass
-
-#![feature(cow_is_borrowed)]
-
-use std::borrow::Cow;
-
-fn main() {
-    const COW: Cow<str> = Cow::Borrowed("moo");
-
-    const IS_BORROWED: bool = COW.is_borrowed();
-    assert!(IS_BORROWED);
-
-    const IS_OWNED: bool = COW.is_owned();
-    assert!(!IS_OWNED);
-}
diff --git a/src/test/ui/consts/is_ascii.rs b/src/test/ui/consts/is_ascii.rs
deleted file mode 100644
index d8424549f93e6..0000000000000
--- a/src/test/ui/consts/is_ascii.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// run-pass
-
-static X: bool = 'a'.is_ascii();
-static Y: bool = 'ä'.is_ascii();
-
-static BX: bool = b'a'.is_ascii();
-static BY: bool = 192u8.is_ascii();
-
-fn main() {
-    assert!(X);
-    assert!(!Y);
-
-    assert!(BX);
-    assert!(!BY);
-}
diff --git a/src/test/ui/consts/std/net/ipv4.rs b/src/test/ui/consts/std/net/ipv4.rs
deleted file mode 100644
index 8c676999ae734..0000000000000
--- a/src/test/ui/consts/std/net/ipv4.rs
+++ /dev/null
@@ -1,58 +0,0 @@
-// run-pass
-
-#![feature(ip)]
-#![feature(const_ipv4)]
-
-use std::net::{Ipv4Addr, Ipv6Addr};
-
-fn main() {
-    const IP_ADDRESS: Ipv4Addr = Ipv4Addr::new(127, 0, 0, 1);
-    assert_eq!(IP_ADDRESS, Ipv4Addr::LOCALHOST);
-
-    const OCTETS: [u8; 4] = IP_ADDRESS.octets();
-    assert_eq!(OCTETS, [127, 0, 0, 1]);
-
-    const IS_UNSPECIFIED : bool = IP_ADDRESS.is_unspecified();
-    assert!(!IS_UNSPECIFIED);
-
-    const IS_LOOPBACK : bool = IP_ADDRESS.is_loopback();
-    assert!(IS_LOOPBACK);
-
-    const IS_PRIVATE : bool = IP_ADDRESS.is_private();
-    assert!(!IS_PRIVATE);
-
-    const IS_LINK_LOCAL : bool = IP_ADDRESS.is_link_local();
-    assert!(!IS_LINK_LOCAL);
-
-    const IS_GLOBAL : bool = IP_ADDRESS.is_global();
-    assert!(!IS_GLOBAL);
-
-    const IS_SHARED : bool = IP_ADDRESS.is_shared();
-    assert!(!IS_SHARED);
-
-    const IS_IETF_PROTOCOL_ASSIGNMENT : bool = IP_ADDRESS.is_ietf_protocol_assignment();
-    assert!(!IS_IETF_PROTOCOL_ASSIGNMENT);
-
-    const IS_BENCHMARKING : bool = IP_ADDRESS.is_benchmarking();
-    assert!(!IS_BENCHMARKING);
-
-    const IS_RESERVED : bool = IP_ADDRESS.is_reserved();
-    assert!(!IS_RESERVED);
-
-    const IS_MULTICAST : bool = IP_ADDRESS.is_multicast();
-    assert!(!IS_MULTICAST);
-
-    const IS_BROADCAST : bool = IP_ADDRESS.is_broadcast();
-    assert!(!IS_BROADCAST);
-
-    const IS_DOCUMENTATION : bool = IP_ADDRESS.is_documentation();
-    assert!(!IS_DOCUMENTATION);
-
-    const IP_V6_COMPATIBLE : Ipv6Addr = IP_ADDRESS.to_ipv6_compatible();
-    assert_eq!(IP_V6_COMPATIBLE,
-        Ipv6Addr::from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 127, 0, 0, 1]));
-
-    const IP_V6_MAPPED : Ipv6Addr = IP_ADDRESS.to_ipv6_mapped();
-    assert_eq!(IP_V6_MAPPED,
-        Ipv6Addr::from([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 127, 0, 0, 1]));
-}
diff --git a/src/test/ui/consts/std/net/ipv6.rs b/src/test/ui/consts/std/net/ipv6.rs
deleted file mode 100644
index e3841c38c2231..0000000000000
--- a/src/test/ui/consts/std/net/ipv6.rs
+++ /dev/null
@@ -1,53 +0,0 @@
-// run-pass
-
-#![feature(ip)]
-#![feature(const_ipv6)]
-
-use std::net::{Ipv4Addr, Ipv6Addr, Ipv6MulticastScope};
-
-fn main() {
-    const IP_ADDRESS : Ipv6Addr = Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1);
-    assert_eq!(IP_ADDRESS, Ipv6Addr::LOCALHOST);
-
-    const SEGMENTS : [u16; 8] = IP_ADDRESS.segments();
-    assert_eq!(SEGMENTS, [0 ,0 ,0 ,0 ,0 ,0 ,0, 1]);
-
-    const OCTETS : [u8; 16] = IP_ADDRESS.octets();
-    assert_eq!(OCTETS, [0 ,0 ,0 ,0 ,0 ,0 ,0, 0 ,0 ,0 ,0 ,0 ,0 ,0, 0, 1]);
-
-    const IS_UNSPECIFIED : bool = IP_ADDRESS.is_unspecified();
-    assert!(!IS_UNSPECIFIED);
-
-    const IS_LOOPBACK : bool = IP_ADDRESS.is_loopback();
-    assert!(IS_LOOPBACK);
-
-    const IS_GLOBAL : bool = IP_ADDRESS.is_global();
-    assert!(!IS_GLOBAL);
-
-    const IS_UNIQUE_LOCAL : bool = IP_ADDRESS.is_unique_local();
-    assert!(!IS_UNIQUE_LOCAL);
-
-    const IS_UNICAST_LINK_LOCAL_STRICT : bool = IP_ADDRESS.is_unicast_link_local_strict();
-    assert!(!IS_UNICAST_LINK_LOCAL_STRICT);
-
-    const IS_UNICAST_LINK_LOCAL : bool = IP_ADDRESS.is_unicast_link_local();
-    assert!(!IS_UNICAST_LINK_LOCAL);
-
-    const IS_UNICAST_SITE_LOCAL : bool = IP_ADDRESS.is_unicast_site_local();
-    assert!(!IS_UNICAST_SITE_LOCAL);
-
-    const IS_DOCUMENTATION : bool = IP_ADDRESS.is_documentation();
-    assert!(!IS_DOCUMENTATION);
-
-    const IS_UNICAST_GLOBAL : bool = IP_ADDRESS.is_unicast_global();
-    assert!(!IS_UNICAST_GLOBAL);
-
-    const MULTICAST_SCOPE : Option<Ipv6MulticastScope> = IP_ADDRESS.multicast_scope();
-    assert_eq!(MULTICAST_SCOPE, None);
-
-    const IS_MULTICAST : bool = IP_ADDRESS.is_multicast();
-    assert!(!IS_MULTICAST);
-
-    const IP_V4 : Option<Ipv4Addr> = IP_ADDRESS.to_ipv4();
-    assert_eq!(IP_V4.unwrap(), Ipv4Addr::new(0, 0, 0, 1));
-}
diff --git a/src/test/ui/str/str-idx.stderr b/src/test/ui/str/str-idx.stderr
index ef7ce735868cb..f323ba03c012c 100644
--- a/src/test/ui/str/str-idx.stderr
+++ b/src/test/ui/str/str-idx.stderr
@@ -6,7 +6,7 @@ LL |     let _: u8 = s[4];
    |
    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
    = note: you can use `.chars().nth()` or `.bytes().nth()`
-           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
+           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
    = note: required because of the requirements on the impl of `Index<{integer}>` for `str`
 
 error[E0277]: the type `str` cannot be indexed by `{integer}`
@@ -17,7 +17,7 @@ LL |     let _ = s.get(4);
    |
    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
    = note: you can use `.chars().nth()` or `.bytes().nth()`
-           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
+           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
 
 error[E0277]: the type `str` cannot be indexed by `{integer}`
   --> $DIR/str-idx.rs:5:29
@@ -27,7 +27,7 @@ LL |     let _ = s.get_unchecked(4);
    |
    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
    = note: you can use `.chars().nth()` or `.bytes().nth()`
-           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
+           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
 
 error[E0277]: the type `str` cannot be indexed by `char`
   --> $DIR/str-idx.rs:6:17
diff --git a/src/test/ui/str/str-mut-idx.stderr b/src/test/ui/str/str-mut-idx.stderr
index abb9b09cf3871..405542820a394 100644
--- a/src/test/ui/str/str-mut-idx.stderr
+++ b/src/test/ui/str/str-mut-idx.stderr
@@ -39,7 +39,7 @@ LL |     s.get_mut(1);
    |
    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
    = note: you can use `.chars().nth()` or `.bytes().nth()`
-           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
+           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
 
 error[E0277]: the type `str` cannot be indexed by `{integer}`
   --> $DIR/str-mut-idx.rs:11:25
@@ -49,7 +49,7 @@ LL |     s.get_unchecked_mut(1);
    |
    = help: the trait `SliceIndex<str>` is not implemented for `{integer}`
    = note: you can use `.chars().nth()` or `.bytes().nth()`
-           see chapter in The Book <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
+           for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
 
 error[E0277]: the type `str` cannot be indexed by `char`
   --> $DIR/str-mut-idx.rs:13:5
diff --git a/src/test/ui/try-block/try-block-in-return.rs b/src/test/ui/try-block/try-block-in-return.rs
new file mode 100644
index 0000000000000..a15bfeef1c12d
--- /dev/null
+++ b/src/test/ui/try-block/try-block-in-return.rs
@@ -0,0 +1,12 @@
+// run-pass
+// compile-flags: --edition 2018
+
+#![feature(try_blocks)]
+
+fn issue_76271() -> Option<i32> {
+    return try { 4 }
+}
+
+fn main() {
+    assert_eq!(issue_76271(), Some(4));
+}
diff --git a/src/tools/compiletest/src/common.rs b/src/tools/compiletest/src/common.rs
index 848bd3a43e890..2f832b53a9039 100644
--- a/src/tools/compiletest/src/common.rs
+++ b/src/tools/compiletest/src/common.rs
@@ -261,6 +261,9 @@ pub struct Config {
     /// Path to / name of the Microsoft Console Debugger (CDB) executable
     pub cdb: Option<OsString>,
 
+    /// Version of CDB
+    pub cdb_version: Option<[u16; 4]>,
+
     /// Path to / name of the GDB executable
     pub gdb: Option<String>,
 
diff --git a/src/tools/compiletest/src/header.rs b/src/tools/compiletest/src/header.rs
index 0efa668ecc88b..17649dfab3750 100644
--- a/src/tools/compiletest/src/header.rs
+++ b/src/tools/compiletest/src/header.rs
@@ -8,8 +8,8 @@ use std::path::{Path, PathBuf};
 use tracing::*;
 
 use crate::common::{CompareMode, Config, Debugger, FailMode, Mode, PassMode};
-use crate::extract_gdb_version;
 use crate::util;
+use crate::{extract_cdb_version, extract_gdb_version};
 
 #[cfg(test)]
 mod tests;
@@ -105,6 +105,10 @@ impl EarlyProps {
                     props.ignore = true;
                 }
 
+                if config.debugger == Some(Debugger::Cdb) && ignore_cdb(config, ln) {
+                    props.ignore = true;
+                }
+
                 if config.debugger == Some(Debugger::Gdb) && ignore_gdb(config, ln) {
                     props.ignore = true;
                 }
@@ -131,6 +135,21 @@ impl EarlyProps {
 
         return props;
 
+        fn ignore_cdb(config: &Config, line: &str) -> bool {
+            if let Some(actual_version) = config.cdb_version {
+                if let Some(min_version) = line.strip_prefix("min-cdb-version:").map(str::trim) {
+                    let min_version = extract_cdb_version(min_version).unwrap_or_else(|| {
+                        panic!("couldn't parse version range: {:?}", min_version);
+                    });
+
+                    // Ignore if actual version is smaller than the minimum
+                    // required version
+                    return actual_version < min_version;
+                }
+            }
+            false
+        }
+
         fn ignore_gdb(config: &Config, line: &str) -> bool {
             if let Some(actual_version) = config.gdb_version {
                 if let Some(rest) = line.strip_prefix("min-gdb-version:").map(str::trim) {
@@ -142,8 +161,8 @@ impl EarlyProps {
                     if start_ver != end_ver {
                         panic!("Expected single GDB version")
                     }
-                    // Ignore if actual version is smaller the minimum required
-                    // version
+                    // Ignore if actual version is smaller than the minimum
+                    // required version
                     return actual_version < start_ver;
                 } else if let Some(rest) = line.strip_prefix("ignore-gdb-version:").map(str::trim) {
                     let (min_version, max_version) =
diff --git a/src/tools/compiletest/src/main.rs b/src/tools/compiletest/src/main.rs
index adf2fa7fd8ecc..190a9c6221060 100644
--- a/src/tools/compiletest/src/main.rs
+++ b/src/tools/compiletest/src/main.rs
@@ -163,7 +163,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
 
     let target = opt_str2(matches.opt_str("target"));
     let android_cross_path = opt_path(matches, "android-cross-path");
-    let cdb = analyze_cdb(matches.opt_str("cdb"), &target);
+    let (cdb, cdb_version) = analyze_cdb(matches.opt_str("cdb"), &target);
     let (gdb, gdb_version, gdb_native_rust) =
         analyze_gdb(matches.opt_str("gdb"), &target, &android_cross_path);
     let (lldb_version, lldb_native_rust) = matches
@@ -216,6 +216,7 @@ pub fn parse_config(args: Vec<String>) -> Config {
         target,
         host: opt_str2(matches.opt_str("host")),
         cdb,
+        cdb_version,
         gdb,
         gdb_version,
         gdb_native_rust,
@@ -773,8 +774,30 @@ fn find_cdb(target: &str) -> Option<OsString> {
 }
 
 /// Returns Path to CDB
-fn analyze_cdb(cdb: Option<String>, target: &str) -> Option<OsString> {
-    cdb.map(OsString::from).or_else(|| find_cdb(target))
+fn analyze_cdb(cdb: Option<String>, target: &str) -> (Option<OsString>, Option<[u16; 4]>) {
+    let cdb = cdb.map(OsString::from).or_else(|| find_cdb(target));
+
+    let mut version = None;
+    if let Some(cdb) = cdb.as_ref() {
+        if let Ok(output) = Command::new(cdb).arg("/version").output() {
+            if let Some(first_line) = String::from_utf8_lossy(&output.stdout).lines().next() {
+                version = extract_cdb_version(&first_line);
+            }
+        }
+    }
+
+    (cdb, version)
+}
+
+fn extract_cdb_version(full_version_line: &str) -> Option<[u16; 4]> {
+    // Example full_version_line: "cdb version 10.0.18362.1"
+    let version = full_version_line.rsplit(' ').next()?;
+    let mut components = version.split('.');
+    let major: u16 = components.next().unwrap().parse().unwrap();
+    let minor: u16 = components.next().unwrap().parse().unwrap();
+    let patch: u16 = components.next().unwrap_or("0").parse().unwrap();
+    let build: u16 = components.next().unwrap_or("0").parse().unwrap();
+    Some([major, minor, patch, build])
 }
 
 /// Returns (Path to GDB, GDB Version, GDB has Rust Support)