Auto merge of #61150 - Centril:rollup-wmm7qga, r=Centril

Rollup of 13 pull requests

Successful merges:

 - #61026 (Tweak macro parse errors when reaching EOF during macro call parse)
 - #61095 (Update cargo)
 - #61096 (tidy: don't short-circuit on license error)
 - #61107 (Fix a couple docs typos)
 - #61110 (Revert edition-guide toolstate override)
 - #61111 (Fixed type-alias-bounds lint doc)
 - #61113 (Deprecate `FnBox`. `Box<dyn FnOnce()>` can be called directly, since 1.35)
 - #61116 (Remove the incorrect warning from README.md)
 - #61118 (Dont ICE on an attempt to use GAT without feature gate)
 - #61121 (improve debug-printing of scalars)
 - #61125 (Updated my mailmap entry)
 - #61134 (Annotate each `reverse_bits` with `#[must_use]`)
 - #61138 (Move async/await tests to their own folder)

Failed merges:

r? @ghost

.mailmap

@@ -6,7 +6,7 @@
 #
 
 Aaron Todd <github@opprobrio.us>
-Aaron Power <theaaronepower@gmail.com>
+Aaron Power <theaaronepower@gmail.com> Erin Power <xampprocky@gmail.com>
 Abhishek Chanda <abhishek.becs@gmail.com> Abhishek Chanda <abhishek@cloudscaling.com>
 Adolfo Ochagavía <aochagavia92@gmail.com>
 Adrien Tétar <adri-from-59@hotmail.fr>

Cargo.lock

@@ -253,7 +253,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cargo"
-version = "0.37.0"
+version = "0.38.0"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "bufstream 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -261,7 +261,7 @@ dependencies = [
  "bytesize 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "core-foundation 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "crates-io 0.25.0",
+ "crates-io 0.26.0",
  "crossbeam-utils 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "crypto-hash 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "curl 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -278,7 +278,7 @@ dependencies = [
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "home 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ignore 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "im-rc 12.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "im-rc 13.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jobserver 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazycell 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -300,6 +300,7 @@ dependencies = [
  "serde_ignored 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "shell-escape 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strip-ansi-escapes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -537,7 +538,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "crates-io"
-version = "0.25.0"
+version = "0.26.0"
 dependencies = [
  "curl 0.4.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1163,10 +1164,11 @@ dependencies = [
 
 [[package]]
 name = "im-rc"
-version = "12.3.0"
+version = "13.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sized-chunks 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2239,7 +2241,7 @@ dependencies = [
 name = "rls"
 version = "1.36.0"
 dependencies = [
- "cargo 0.37.0",
+ "cargo 0.38.0",
  "cargo_metadata 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "clippy_lints 0.0.212",
  "crossbeam-channel 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3263,6 +3265,14 @@ name = "siphasher"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "sized-chunks"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "typenum 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.2"
@@ -3348,6 +3358,14 @@ name = "string_cache_shared"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "strip-ansi-escapes"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "vte 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "strsim"
 version = "0.7.0"
@@ -3924,6 +3942,11 @@ name = "utf8-ranges"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "utf8parse"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "vcpkg"
 version = "0.2.6"
@@ -3954,6 +3977,14 @@ name = "void"
 version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "vte"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "utf8parse 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "wait-timeout"
 version = "0.1.5"
@@ -4158,7 +4189,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum idna 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "38f09e0f0b1fb55fdee1f17470ad800da77af5186a1a76c026b679358b7e844e"
 "checksum if_chain 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4bac95d9aa0624e7b78187d6fb8ab012b41d9f6f54b1bcb61e61c4845f8357ec"
 "checksum ignore 0.4.7 (registry+https://github.com/rust-lang/crates.io-index)" = "8dc57fa12805f367736a38541ac1a9fc6a52812a0ca959b1d4d4b640a89eb002"
-"checksum im-rc 12.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9460397452f537fd51808056ff209f4c4c4c9d20d42ae952f517708726284972"
+"checksum im-rc 13.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0a0197597d095c0d11107975d3175173f810ee572c2501ff4de64f4f3f119806"
 "checksum iovec 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dbe6e417e7d0975db6512b90796e8ce223145ac4e33c377e4a42882a0e88bb08"
 "checksum is-match 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7e5b386aef33a1c677be65237cb9d32c3f3ef56bd035949710c4bb13083eb053"
 "checksum itertools 0.7.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f58856976b776fedd95533137617a02fb25719f40e7d9b01c7043cd65474f450"
@@ -4309,6 +4340,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 "checksum signal-hook 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "1f272d1b7586bec132ed427f532dd418d8beca1ca7f2caf7df35569b1415a4b4"
 "checksum siphasher 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "0df90a788073e8d0235a67e50441d47db7c8ad9debd91cbf43736a2a92d36537"
+"checksum sized-chunks 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a2a2eb3fe454976eefb479f78f9b394d34d661b647c6326a3a6e66f68bb12c26"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b73ea3738b47563803ef814925e69be00799a8c07420be8b996f8e98fb2336db"
 "checksum socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "c4d11a52082057d87cb5caa31ad812f4504b97ab44732cd8359df2e9ff9f48e7"
@@ -4316,6 +4348,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum string_cache 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "25d70109977172b127fe834e5449e5ab1740b9ba49fa18a2020f509174f25423"
 "checksum string_cache_codegen 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1eea1eee654ef80933142157fdad9dd8bc43cf7c74e999e369263496f04ff4da"
 "checksum string_cache_shared 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1884d1bc09741d466d9b14e6d37ac89d6909cbcac41dd9ae982d4d063bbedfc"
+"checksum strip-ansi-escapes 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9d63676e2abafa709460982ddc02a3bb586b6d15a49b75c212e06edd3933acee"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum strum 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f6c3a2071519ab6a48f465808c4c1ffdd00dfc8e93111d02b4fc5abab177676e"
 "checksum strum_macros 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8baacebd7b7c9b864d83a6ba7a246232983e277b86fa5cdec77f565715a4b136"
@@ -4368,11 +4401,13 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum url_serde 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "74e7d099f1ee52f823d4bdd60c93c3602043c728f5db3b97bdb548467f7bddea"
 "checksum utf-8 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f1262dfab4c30d5cb7c07026be00ee343a6cf5027fdc0104a9160f354e5db75c"
 "checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
+"checksum utf8parse 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8772a4ccbb4e89959023bc5b7cb8623a795caa7092d99f3aa9501b9484d4557d"
 "checksum vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "def296d3eb3b12371b2c7d0e83bfe1403e4db2d7a0bba324a12b21c4ee13143d"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum vergen 3.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "6aba5e34f93dc7051dfad05b98a18e9156f27e7b431fe1d2398cb6061c0a1dba"
 "checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+"checksum vte 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4f42f536e22f7fcbb407639765c8fd78707a33109301f834a594758bedd6e8cf"
 "checksum wait-timeout 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "b9f3bf741a801531993db6478b95682117471f76916f5e690dd8d45395b09349"
 "checksum walkdir 2.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "9d9d7ed3431229a144296213105a390676cc49c9b6a72bd19f3176c98e129fa1"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"

README.md

@@ -134,9 +134,8 @@ MSVC builds of Rust additionally require an installation of Visual Studio 2017
 
 [Visual Studio Build Tools]: https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2019
 
-At last check (cmake 3.14.3 and msvc 16.0.3) using the 2019 tools fails to
+(If you're installing cmake yourself, be careful that “C++ CMake tools for
-build the in-tree LLVM build with a CMake error, so use 2017 instead by
+Windows” doesn't get included under “Individual components”.)
-including the “MSVC v141 – VS 2017 C++ x64/x86 build tools (v14.16)” component.
 
 With these dependencies installed, you can build the compiler in a `cmd.exe`
 shell with:
@@ -151,7 +150,7 @@ then you may need to force rustbuild to use an older version. This can be done
 by manually calling the appropriate vcvars file before running the bootstrap.
 
 ```batch
-> CALL "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\vcvars64.bat"
+> CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvars64.bat"
 > python x.py build
 ```
 

src/ci/docker/x86_64-gnu-tools/checktools.sh

@@ -74,9 +74,7 @@ status_check() {
     check_dispatch $1 beta nomicon src/doc/nomicon
     check_dispatch $1 beta reference src/doc/reference
     check_dispatch $1 beta rust-by-example src/doc/rust-by-example
-    # Temporarily disabled until
+    check_dispatch $1 beta edition-guide src/doc/edition-guide
-    # https://github.com/rust-lang/rust/issues/60459 is fixed.
-    # check_dispatch $1 beta edition-guide src/doc/edition-guide
     check_dispatch $1 beta rls src/tools/rls
     check_dispatch $1 beta rustfmt src/tools/rustfmt
     check_dispatch $1 beta clippy-driver src/tools/clippy

src/doc/rustc/src/lints/listing/warn-by-default.md

@@ -529,18 +529,21 @@ This lint detects bounds in type aliases. These are not currently enforced.
 Some example code that triggers this lint:
 
 ```rust
+#[allow(dead_code)]
 type SendVec<T: Send> = Vec<T>;
 ```
 
 This will produce:
 
 ```text
-warning: type alias is never used: `SendVec`
+warning: bounds on generic parameters are not enforced in type aliases
- --> src/main.rs:1:1
+ --> src/lib.rs:2:17
   |
-1 | type SendVec<T: Send> = Vec<T>;
+2 | type SendVec<T: Send> = Vec<T>;
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  |                 ^^^^
   |
+  = note: #[warn(type_alias_bounds)] on by default
+  = help: the bound will not be checked when the type alias is used, and should be removed
 ```
 
 ## tyvar-behind-raw-pointer

src/liballoc/boxed.rs

@@ -759,13 +759,14 @@ impl<A, F: Fn<A> + ?Sized> Fn<A> for Box<F> {
     }
 }
 
+/// `FnBox` is deprecated and will be removed.
+/// `Box<dyn FnOnce()>` can be called directly, since Rust 1.35.0.
+///
 /// `FnBox` is a version of the `FnOnce` intended for use with boxed
-/// closure objects. The idea is that where one would normally store a
+/// closure objects. The idea was that where one would normally store a
-/// `Box<dyn FnOnce()>` in a data structure, you should use
+/// `Box<dyn FnOnce()>` in a data structure, you whould use
 /// `Box<dyn FnBox()>`. The two traits behave essentially the same, except
-/// that a `FnBox` closure can only be called if it is boxed. (Note
+/// that a `FnBox` closure can only be called if it is boxed.
-/// that `FnBox` may be deprecated in the future if `Box<dyn FnOnce()>`
-/// closures become directly usable.)
 ///
 /// # Examples
 ///
@@ -777,6 +778,7 @@ impl<A, F: Fn<A> + ?Sized> Fn<A> for Box<F> {
 ///
 /// ```
 /// #![feature(fnbox)]
+/// #![allow(deprecated)]
 ///
 /// use std::boxed::FnBox;
 /// use std::collections::HashMap;
@@ -796,16 +798,38 @@ impl<A, F: Fn<A> + ?Sized> Fn<A> for Box<F> {
 ///     }
 /// }
 /// ```
+///
+/// In Rust 1.35.0 or later, use `FnOnce`, `FnMut`, or `Fn` instead:
+///
+/// ```
+/// use std::collections::HashMap;
+///
+/// fn make_map() -> HashMap<i32, Box<dyn FnOnce() -> i32>> {
+///     let mut map: HashMap<i32, Box<dyn FnOnce() -> i32>> = HashMap::new();
+///     map.insert(1, Box::new(|| 22));
+///     map.insert(2, Box::new(|| 44));
+///     map
+/// }
+///
+/// fn main() {
+///     let mut map = make_map();
+///     for i in &[1, 2] {
+///         let f = map.remove(&i).unwrap();
+///         assert_eq!(f(), i * 22);
+///     }
+/// }
+/// ```
 #[rustc_paren_sugar]
-#[unstable(feature = "fnbox",
+#[unstable(feature = "fnbox", issue = "28796")]
-           reason = "will be deprecated if and when `Box<FnOnce>` becomes usable", issue = "28796")]
+#[rustc_deprecated(reason = "use `FnOnce`, `FnMut`, or `Fn` instead", since = "1.37.0")]
 pub trait FnBox<A>: FnOnce<A> {
     /// Performs the call operation.
     fn call_box(self: Box<Self>, args: A) -> Self::Output;
 }
 
-#[unstable(feature = "fnbox",
+#[unstable(feature = "fnbox", issue = "28796")]
-           reason = "will be deprecated if and when `Box<FnOnce>` becomes usable", issue = "28796")]
+#[rustc_deprecated(reason = "use `FnOnce`, `FnMut`, or `Fn` instead", since = "1.37.0")]
+#[allow(deprecated, deprecated_in_future)]
 impl<A, F> FnBox<A> for F
     where F: FnOnce<A>
 {

src/libcore/cell.rs

@@ -11,7 +11,7 @@
 //! mutate it.
 //!
 //! Shareable mutable containers exist to permit mutability in a controlled manner, even in the
-//! presence of aliasing. Both `Cell<T>` and `RefCell<T>` allows to do this in a single threaded
+//! presence of aliasing. Both `Cell<T>` and `RefCell<T>` allow doing this in a single-threaded
 //! way. However, neither `Cell<T>` nor `RefCell<T>` are thread safe (they do not implement
 //! `Sync`). If you need to do aliasing and mutation between multiple threads it is possible to
 //! use [`Mutex`](../../std/sync/struct.Mutex.html),

src/libcore/num/mod.rs

@@ -473,6 +473,7 @@ assert_eq!(m, ", $reversed, ");
             #[unstable(feature = "reverse_bits", issue = "48763")]
             #[rustc_const_unstable(feature = "const_int_conversion")]
             #[inline]
+            #[must_use]
             pub const fn reverse_bits(self) -> Self {
                 (self as $UnsignedT).reverse_bits() as Self
             }
@@ -2522,6 +2523,7 @@ assert_eq!(m, ", $reversed, ");
 ```"),
             #[unstable(feature = "reverse_bits", issue = "48763")]
             #[inline]
+            #[must_use]
             pub const fn reverse_bits(self) -> Self {
                 intrinsics::bitreverse(self as $ActualT) as Self
             }

src/libcore/num/wrapping.rs

@@ -524,6 +524,7 @@ assert_eq!(n.trailing_zeros(), 3);
             /// ```
             #[unstable(feature = "reverse_bits", issue = "48763")]
             #[inline]
+            #[must_use]
             pub const fn reverse_bits(self) -> Self {
                 Wrapping(self.0.reverse_bits())
             }

src/librustc/middle/region.rs

@@ -658,12 +658,15 @@ impl<'tcx> ScopeTree {
             // The lifetime was defined on node that doesn't own a body,
             // which in practice can only mean a trait or an impl, that
             // is the parent of a method, and that is enforced below.
-            assert_eq!(Some(param_owner_id), self.root_parent,
+            if Some(param_owner_id) != self.root_parent {
-                       "free_scope: {:?} not recognized by the \
+                tcx.sess.delay_span_bug(
-                        region scope tree for {:?} / {:?}",
+                    DUMMY_SP,
-                       param_owner,
+                    &format!("free_scope: {:?} not recognized by the \
-                       self.root_parent.map(|id| tcx.hir().local_def_id_from_hir_id(id)),
+                              region scope tree for {:?} / {:?}",
-                       self.root_body.map(|hir_id| DefId::local(hir_id.owner)));
+                             param_owner,
+                             self.root_parent.map(|id| tcx.hir().local_def_id_from_hir_id(id)),
+                             self.root_body.map(|hir_id| DefId::local(hir_id.owner))));
+            }
 
             // The trait/impl lifetime is in scope for the method's body.
             self.root_body.unwrap().local_id

src/librustc/mir/interpret/pointer.rs

@@ -1,3 +1,5 @@
+use std::fmt;
+
 use crate::mir;
 use crate::ty::layout::{self, HasDataLayout, Size};
 use rustc_macros::HashStable;
@@ -70,7 +72,7 @@ impl<T: layout::HasDataLayout> PointerArithmetic for T {}
 ///
 /// Pointer is also generic over the `Tag` associated with each pointer,
 /// which is used to do provenance tracking during execution.
-#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd,
+#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd,
          RustcEncodable, RustcDecodable, Hash, HashStable)]
 pub struct Pointer<Tag=(),Id=AllocId> {
     pub alloc_id: Id,
@@ -80,6 +82,18 @@ pub struct Pointer<Tag=(),Id=AllocId> {
 
 static_assert_size!(Pointer, 16);
 
+impl<Tag: fmt::Debug, Id: fmt::Debug> fmt::Debug for Pointer<Tag, Id> {
+    default fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}.{:#x}[{:?}]", self.alloc_id, self.offset.bytes(), self.tag)
+    }
+}
+// Specialization for no tag
+impl<Id: fmt::Debug> fmt::Debug for Pointer<(), Id> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}.{:#x}", self.alloc_id, self.offset.bytes())
+    }
+}
+
 /// Produces a `Pointer` which points to the beginning of the Allocation
 impl From<AllocId> for Pointer {
     #[inline(always)]

src/librustc/mir/interpret/value.rs

@@ -93,7 +93,7 @@ impl<'tcx> ConstValue<'tcx> {
 /// `memory::Allocation`. It is in many ways like a small chunk of a `Allocation`, up to 8 bytes in
 /// size. Like a range of bytes in an `Allocation`, a `Scalar` can either represent the raw bytes
 /// of a simple value or a pointer into another `Allocation`
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd,
+#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd,
          RustcEncodable, RustcDecodable, Hash, HashStable)]
 pub enum Scalar<Tag=(), Id=AllocId> {
     /// The raw bytes of a simple value.
@@ -113,6 +113,27 @@ pub enum Scalar<Tag=(), Id=AllocId> {
 #[cfg(target_arch = "x86_64")]
 static_assert_size!(Scalar, 24);
 
+impl<Tag: fmt::Debug, Id: fmt::Debug> fmt::Debug for Scalar<Tag, Id> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Scalar::Ptr(ptr) =>
+                write!(f, "{:?}", ptr),
+            &Scalar::Bits { bits, size } => {
+                if size == 0 {
+                    assert_eq!(bits, 0, "ZST value must be 0");
+                    write!(f, "<ZST>")
+                } else {
+                    assert_eq!(truncate(bits, Size::from_bytes(size as u64)), bits,
+                            "Scalar value {:#x} exceeds size of {} bytes", bits, size);
+                    // Format as hex number wide enough to fit any value of the given `size`.
+                    // So bits=20, size=1 will be "0x14", but with size=4 it'll be "0x00000014".
+                    write!(f, "0x{:>0width$x}", bits, width=(size*2) as usize)
+                }
+            }
+        }
+    }
+}
+
 impl<Tag> fmt::Display for Scalar<Tag> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -412,7 +433,7 @@ impl<Tag> From<Pointer<Tag>> for Scalar<Tag> {
     }
 }
 
-#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)]
+#[derive(Clone, Copy, Eq, PartialEq, Ord, PartialOrd, RustcEncodable, RustcDecodable, Hash)]
 pub enum ScalarMaybeUndef<Tag=(), Id=AllocId> {
     Scalar(Scalar<Tag, Id>),
     Undef,
@@ -425,6 +446,15 @@ impl<Tag> From<Scalar<Tag>> for ScalarMaybeUndef<Tag> {
     }
 }
 
+impl<Tag: fmt::Debug, Id: fmt::Debug> fmt::Debug for ScalarMaybeUndef<Tag, Id> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ScalarMaybeUndef::Undef => write!(f, "Undef"),
+            ScalarMaybeUndef::Scalar(s) => write!(f, "{:?}", s),
+        }
+    }
+}
+
 impl<Tag> fmt::Display for ScalarMaybeUndef<Tag> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {

src/librustc/traits/on_unimplemented.rs

@@ -226,12 +226,12 @@ impl<'a, 'gcx, 'tcx> OnUnimplementedFormatString {
         Ok(result)
     }
 
-    fn verify(&self,
+    fn verify(
-              tcx: TyCtxt<'a, 'gcx, 'tcx>,
+        &self,
-              trait_def_id: DefId,
+        tcx: TyCtxt<'a, 'gcx, 'tcx>,
-              span: Span)
+        trait_def_id: DefId,
-              -> Result<(), ErrorReported>
+        span: Span,
-    {
+    ) -> Result<(), ErrorReported> {
         let name = tcx.item_name(trait_def_id);
         let generics = tcx.generics_of(trait_def_id);
         let parser = Parser::new(&self.0, None, vec![], false);
@@ -272,12 +272,12 @@ impl<'a, 'gcx, 'tcx> OnUnimplementedFormatString {
         result
     }
 
-    pub fn format(&self,
+    pub fn format(
-                  tcx: TyCtxt<'a, 'gcx, 'tcx>,
+        &self,
-                  trait_ref: ty::TraitRef<'tcx>,
+        tcx: TyCtxt<'a, 'gcx, 'tcx>,
-                  options: &FxHashMap<String, String>)
+        trait_ref: ty::TraitRef<'tcx>,
-                  -> String
+        options: &FxHashMap<String, String>,
-    {
+    ) -> String {
         let name = tcx.item_name(trait_ref.def_id);
         let trait_str = tcx.def_path_str(trait_ref.def_id);
         let generics = tcx.generics_of(trait_ref.def_id);

src/librustc/ty/subst.rs

@@ -479,21 +479,22 @@ impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for SubstFolder<'a, 'gcx, 'tcx> {
         // the specialized routine `ty::replace_late_regions()`.
         match *r {
             ty::ReEarlyBound(data) => {
-                let r = self.substs.get(data.index as usize).map(|k| k.unpack());
+                let rk = self.substs.get(data.index as usize).map(|k| k.unpack());
-                match r {
+                match rk {
                     Some(UnpackedKind::Lifetime(lt)) => {
                         self.shift_region_through_binders(lt)
                     }
                     _ => {
                         let span = self.span.unwrap_or(DUMMY_SP);
-                        span_bug!(
+                        let msg = format!(
-                            span,
                             "Region parameter out of range \
                              when substituting in region {} (root type={:?}) \
                              (index={})",
                             data.name,
                             self.root_ty,
                             data.index);
+                        self.tcx.sess.delay_span_bug(span, &msg);
+                        r
                     }
                 }
             }

src/libstd/env.rs

@@ -465,7 +465,7 @@ pub struct JoinPathsError {
 /// # }
 /// ```
 ///
-/// Using `env::join_paths` with `env::spit_paths` to append an item to the `PATH` environment
+/// Using `env::join_paths` with [`env::split_paths`] to append an item to the `PATH` environment
 /// variable:
 ///
 /// ```
@@ -483,6 +483,8 @@ pub struct JoinPathsError {
 ///     Ok(())
 /// }
 /// ```
+///
+/// [`env::split_paths`]: fn.split_paths.html
 #[stable(feature = "env", since = "1.0.0")]
 pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
     where I: IntoIterator<Item=T>, T: AsRef<OsStr>

src/libsyntax/attr/mod.rs

@@ -278,7 +278,14 @@ impl Attribute {
     pub fn parse<'a, T, F>(&self, sess: &'a ParseSess, mut f: F) -> PResult<'a, T>
         where F: FnMut(&mut Parser<'a>) -> PResult<'a, T>,
     {
-        let mut parser = Parser::new(sess, self.tokens.clone(), None, false, false);
+        let mut parser = Parser::new(
+            sess,
+            self.tokens.clone(),
+            None,
+            false,
+            false,
+            Some("attribute"),
+        );
         let result = f(&mut parser)?;
         if parser.token != token::Eof {
             parser.unexpected()?;

src/libsyntax/ext/base.rs

@@ -11,7 +11,7 @@ use crate::parse::{self, parser, DirectoryOwnership};
 use crate::parse::token;
 use crate::ptr::P;
 use crate::symbol::{kw, sym, Ident, Symbol};
-use crate::ThinVec;
+use crate::{ThinVec, MACRO_ARGUMENTS};
 use crate::tokenstream::{self, TokenStream};
 
 use errors::{DiagnosticBuilder, DiagnosticId};
@@ -850,7 +850,7 @@ impl<'a> ExtCtxt<'a> {
     }
 
     pub fn new_parser_from_tts(&self, tts: &[tokenstream::TokenTree]) -> parser::Parser<'a> {
-        parse::stream_to_parser(self.parse_sess, tts.iter().cloned().collect())
+        parse::stream_to_parser(self.parse_sess, tts.iter().cloned().collect(), MACRO_ARGUMENTS)
     }
     pub fn source_map(&self) -> &'a SourceMap { self.parse_sess.source_map() }
     pub fn parse_sess(&self) -> &'a parse::ParseSess { self.parse_sess }

src/libsyntax/ext/tt/macro_parser.rs

@@ -658,7 +658,14 @@ pub fn parse(
     recurse_into_modules: bool,
 ) -> NamedParseResult {
     // Create a parser that can be used for the "black box" parts.
-    let mut parser = Parser::new(sess, tts, directory, recurse_into_modules, true);
+    let mut parser = Parser::new(
+        sess,
+        tts,
+        directory,
+        recurse_into_modules,
+        true,
+        crate::MACRO_ARGUMENTS,
+    );
 
     // A queue of possible matcher positions. We initialize it with the matcher position in which
     // the "dot" is before the first token of the first token tree in `ms`. `inner_parse_loop` then

src/libsyntax/ext/tt/macro_rules.rs

@@ -172,7 +172,7 @@ fn generic_extension<'cx>(cx: &'cx mut ExtCtxt<'_>,
                     path: Cow::from(cx.current_expansion.module.directory.as_path()),
                     ownership: cx.current_expansion.directory_ownership,
                 };
-                let mut p = Parser::new(cx.parse_sess(), tts, Some(directory), true, false);
+                let mut p = Parser::new(cx.parse_sess(), tts, Some(directory), true, false, None);
                 p.root_module_name = cx.current_expansion.module.mod_path.last()
                     .map(|id| id.as_str().to_string());
 

src/libsyntax/lib.rs

@@ -31,6 +31,8 @@ pub use rustc_data_structures::thin_vec::ThinVec;
 use ast::AttrId;
 use syntax_pos::edition::Edition;
 
+const MACRO_ARGUMENTS: Option<&'static str> = Some("macro arguments");
+
 // A variant of 'try!' that panics on an Err. This is used as a crutch on the
 // way towards a non-panic!-prone parser. It should be used for fatal parsing
 // errors; eventually we plan to convert all code using panictry to just use

src/libsyntax/parse/diagnostics.rs

@@ -13,7 +13,7 @@ use crate::symbol::kw;
 use crate::ThinVec;
 use errors::{Applicability, DiagnosticBuilder};
 use log::debug;
-use syntax_pos::Span;
+use syntax_pos::{Span, DUMMY_SP};
 
 pub trait RecoverQPath: Sized + 'static {
     const PATH_STYLE: PathStyle = PathStyle::Expr;
@@ -201,7 +201,7 @@ impl<'a> Parser<'a> {
 
         let mut path = ast::Path {
             segments: Vec::new(),
-            span: syntax_pos::DUMMY_SP,
+            span: DUMMY_SP,
         };
         self.parse_path_segments(&mut path.segments, T::PATH_STYLE)?;
         path.span = ty_span.to(self.prev_span);
@@ -267,6 +267,58 @@ impl<'a> Parser<'a> {
         }
     }
 
+    /// Create a `DiagnosticBuilder` for an unexpected token `t` and try to recover if it is a
+    /// closing delimiter.
+    pub fn unexpected_try_recover(
+        &mut self,
+        t: &token::Token,
+    ) -> PResult<'a, bool /* recovered */> {
+        let token_str = pprust::token_to_string(t);
+        let this_token_str = self.this_token_descr();
+        let (prev_sp, sp) = match (&self.token, self.subparser_name) {
+            // Point at the end of the macro call when reaching end of macro arguments.
+            (token::Token::Eof, Some(_)) => {
+                let sp = self.sess.source_map().next_point(self.span);
+                (sp, sp)
+            }
+            // We don't want to point at the following span after DUMMY_SP.
+            // This happens when the parser finds an empty TokenStream.
+            _ if self.prev_span == DUMMY_SP => (self.span, self.span),
+            // EOF, don't want to point at the following char, but rather the last token.
+            (token::Token::Eof, None) => (self.prev_span, self.span),
+            _ => (self.sess.source_map().next_point(self.prev_span), self.span),
+        };
+        let msg = format!(
+            "expected `{}`, found {}",
+            token_str,
+            match (&self.token, self.subparser_name) {
+                (token::Token::Eof, Some(origin)) => format!("end of {}", origin),
+                _ => this_token_str,
+            },
+        );
+        let mut err = self.struct_span_err(sp, &msg);
+        let label_exp = format!("expected `{}`", token_str);
+        match self.recover_closing_delimiter(&[t.clone()], err) {
+            Err(e) => err = e,
+            Ok(recovered) => {
+                return Ok(recovered);
+            }
+        }
+        let cm = self.sess.source_map();
+        match (cm.lookup_line(prev_sp.lo()), cm.lookup_line(sp.lo())) {
+            (Ok(ref a), Ok(ref b)) if a.line == b.line => {
+                // When the spans are in the same line, it means that the only content
+                // between them is whitespace, point only at the found token.
+                err.span_label(sp, label_exp);
+            }
+            _ => {
+                err.span_label(prev_sp, label_exp);
+                err.span_label(sp, "unexpected token");
+            }
+        }
+        Err(err)
+    }
+
     /// Consume alternative await syntaxes like `await <expr>`, `await? <expr>`, `await(<expr>)`
     /// and `await { <expr> }`.
     crate fn parse_incorrect_await_syntax(
@@ -562,4 +614,23 @@ impl<'a> Parser<'a> {
         }
     }
 
+    crate fn expected_expression_found(&self) -> DiagnosticBuilder<'a> {
+        let (span, msg) = match (&self.token, self.subparser_name) {
+            (&token::Token::Eof, Some(origin)) => {
+                let sp = self.sess.source_map().next_point(self.span);
+                (sp, format!("expected expression, found end of {}", origin))
+            }
+            _ => (self.span, format!(
+                "expected expression, found {}",
+                self.this_token_descr(),
+            )),
+        };
+        let mut err = self.struct_span_err(span, &msg);
+        let sp = self.sess.source_map().start_point(self.span);
+        if let Some(sp) = self.sess.ambiguous_block_expr_parse.borrow().get(&sp) {
+            self.sess.expr_parentheses_needed(&mut err, *sp, None);
+        }
+        err.span_label(span, "expected expression");
+        err
+    }
 }

src/libsyntax/parse/mod.rs

@@ -236,7 +236,7 @@ fn maybe_source_file_to_parser(
 ) -> Result<Parser<'_>, Vec<Diagnostic>> {
     let end_pos = source_file.end_pos;
     let (stream, unclosed_delims) = maybe_file_to_stream(sess, source_file, None)?;
-    let mut parser = stream_to_parser(sess, stream);
+    let mut parser = stream_to_parser(sess, stream, None);
     parser.unclosed_delims = unclosed_delims;
     if parser.token == token::Eof && parser.span.is_dummy() {
         parser.span = Span::new(end_pos, end_pos, parser.span.ctxt());
@@ -248,7 +248,7 @@ fn maybe_source_file_to_parser(
 // must preserve old name for now, because quote! from the *existing*
 // compiler expands into it
 pub fn new_parser_from_tts(sess: &ParseSess, tts: Vec<TokenTree>) -> Parser<'_> {
-    stream_to_parser(sess, tts.into_iter().collect())
+    stream_to_parser(sess, tts.into_iter().collect(), crate::MACRO_ARGUMENTS)
 }
 
 
@@ -328,8 +328,12 @@ pub fn maybe_file_to_stream(
 }
 
 /// Given stream and the `ParseSess`, produces a parser.
-pub fn stream_to_parser(sess: &ParseSess, stream: TokenStream) -> Parser<'_> {
+pub fn stream_to_parser<'a>(
-    Parser::new(sess, stream, None, true, false)
+    sess: &'a ParseSess,
+    stream: TokenStream,
+    subparser_name: Option<&'static str>,
+) -> Parser<'a> {
+    Parser::new(sess, stream, None, true, false, subparser_name)
 }
 
 /// Given stream, the `ParseSess` and the base directory, produces a parser.
@@ -343,10 +347,12 @@ pub fn stream_to_parser(sess: &ParseSess, stream: TokenStream) -> Parser<'_> {
 /// The main usage of this function is outside of rustc, for those who uses
 /// libsyntax as a library. Please do not remove this function while refactoring
 /// just because it is not used in rustc codebase!
-pub fn stream_to_parser_with_base_dir<'a>(sess: &'a ParseSess,
+pub fn stream_to_parser_with_base_dir<'a>(
-                                          stream: TokenStream,
+    sess: &'a ParseSess,
-                                          base_dir: Directory<'a>) -> Parser<'a> {
+    stream: TokenStream,
-    Parser::new(sess, stream, Some(base_dir), true, false)
+    base_dir: Directory<'a>,
+) -> Parser<'a> {
+    Parser::new(sess, stream, Some(base_dir), true, false, None)
 }
 
 /// A sequence separator.

src/libsyntax/parse/parser.rs

@@ -51,7 +51,7 @@ use crate::symbol::{kw, sym, Symbol};
 use errors::{Applicability, DiagnosticBuilder, DiagnosticId, FatalError};
 use rustc_target::spec::abi::{self, Abi};
 use syntax_pos::{
-    Span, MultiSpan, BytePos, FileName,
+    BytePos, DUMMY_SP, FileName, MultiSpan, Span,
     hygiene::CompilerDesugaringKind,
 };
 use log::{debug, trace};
@@ -233,6 +233,8 @@ pub struct Parser<'a> {
     /// error.
     crate unclosed_delims: Vec<UnmatchedBrace>,
     last_unexpected_token_span: Option<Span>,
+    /// If present, this `Parser` is not parsing Rust code but rather a macro call.
+    crate subparser_name: Option<&'static str>,
 }
 
 impl<'a> Drop for Parser<'a> {
@@ -309,7 +311,7 @@ impl TokenCursor {
                 self.frame = frame;
                 continue
             } else {
-                return TokenAndSpan { tok: token::Eof, sp: syntax_pos::DUMMY_SP }
+                return TokenAndSpan { tok: token::Eof, sp: DUMMY_SP }
             };
 
             match self.frame.last_token {
@@ -533,17 +535,19 @@ enum TokenExpectType {
 }
 
 impl<'a> Parser<'a> {
-    pub fn new(sess: &'a ParseSess,
+    pub fn new(
-               tokens: TokenStream,
+        sess: &'a ParseSess,
-               directory: Option<Directory<'a>>,
+        tokens: TokenStream,
-               recurse_into_file_modules: bool,
+        directory: Option<Directory<'a>>,
-               desugar_doc_comments: bool)
+        recurse_into_file_modules: bool,
-               -> Self {
+        desugar_doc_comments: bool,
+        subparser_name: Option<&'static str>,
+    ) -> Self {
         let mut parser = Parser {
             sess,
             token: token::Whitespace,
-            span: syntax_pos::DUMMY_SP,
+            span: DUMMY_SP,
-            prev_span: syntax_pos::DUMMY_SP,
+            prev_span: DUMMY_SP,
             meta_var_span: None,
             prev_token_kind: PrevTokenKind::Other,
             restrictions: Restrictions::empty(),
@@ -568,6 +572,7 @@ impl<'a> Parser<'a> {
             max_angle_bracket_count: 0,
             unclosed_delims: Vec::new(),
             last_unexpected_token_span: None,
+            subparser_name,
         };
 
         let tok = parser.next_tok();
@@ -631,44 +636,13 @@ impl<'a> Parser<'a> {
     }
 
     /// Expects and consumes the token `t`. Signals an error if the next token is not `t`.
-    pub fn expect(&mut self, t: &token::Token) -> PResult<'a,  bool /* recovered */> {
+    pub fn expect(&mut self, t: &token::Token) -> PResult<'a, bool /* recovered */> {
         if self.expected_tokens.is_empty() {
             if self.token == *t {
                 self.bump();
                 Ok(false)
             } else {
-                let token_str = pprust::token_to_string(t);
+                self.unexpected_try_recover(t)
-                let this_token_str = self.this_token_descr();
-                let mut err = self.fatal(&format!("expected `{}`, found {}",
-                                                  token_str,
-                                                  this_token_str));
-
-                let sp = if self.token == token::Token::Eof {
-                    // EOF, don't want to point at the following char, but rather the last token
-                    self.prev_span
-                } else {
-                    self.sess.source_map().next_point(self.prev_span)
-                };
-                let label_exp = format!("expected `{}`", token_str);
-                match self.recover_closing_delimiter(&[t.clone()], err) {
-                    Err(e) => err = e,
-                    Ok(recovered) => {
-                        return Ok(recovered);
-                    }
-                }
-                let cm = self.sess.source_map();
-                match (cm.lookup_line(self.span.lo()), cm.lookup_line(sp.lo())) {
-                    (Ok(ref a), Ok(ref b)) if a.line == b.line => {
-                        // When the spans are in the same line, it means that the only content
-                        // between them is whitespace, point only at the found token.
-                        err.span_label(self.span, label_exp);
-                    }
-                    _ => {
-                        err.span_label(sp, label_exp);
-                        err.span_label(self.span, "unexpected token");
-                    }
-                }
-                Err(err)
             }
         } else {
             self.expect_one_of(slice::from_ref(t), &[])
@@ -812,7 +786,7 @@ impl<'a> Parser<'a> {
                     //   |                   expected one of 8 possible tokens here
                     err.span_label(self.span, label_exp);
                 }
-                _ if self.prev_span == syntax_pos::DUMMY_SP => {
+                _ if self.prev_span == DUMMY_SP => {
                     // Account for macro context where the previous span might not be
                     // available to avoid incorrect output (#54841).
                     err.span_label(self.span, "unexpected token");
@@ -2041,7 +2015,7 @@ impl<'a> Parser<'a> {
             path = self.parse_path(PathStyle::Type)?;
             path_span = path_lo.to(self.prev_span);
         } else {
-            path = ast::Path { segments: Vec::new(), span: syntax_pos::DUMMY_SP };
+            path = ast::Path { segments: Vec::new(), span: DUMMY_SP };
             path_span = self.span.to(self.span);
         }
 
@@ -2627,17 +2601,7 @@ impl<'a> Parser<'a> {
                         }
                         Err(mut err) => {
                             self.cancel(&mut err);
-                            let msg = format!("expected expression, found {}",
+                            return Err(self.expected_expression_found());
-                                              self.this_token_descr());
-                            let mut err = self.fatal(&msg);
-                            let sp = self.sess.source_map().start_point(self.span);
-                            if let Some(sp) = self.sess.ambiguous_block_expr_parse.borrow()
-                                .get(&sp)
-                            {
-                                self.sess.expr_parentheses_needed(&mut err, *sp, None);
-                            }
-                            err.span_label(self.span, "expected expression");
-                            return Err(err);
                         }
                     }
                 }
@@ -5592,7 +5556,7 @@ impl<'a> Parser<'a> {
                 where_clause: WhereClause {
                     id: ast::DUMMY_NODE_ID,
                     predicates: Vec::new(),
-                    span: syntax_pos::DUMMY_SP,
+                    span: DUMMY_SP,
                 },
                 span: span_lo.to(self.prev_span),
             })
@@ -5838,7 +5802,7 @@ impl<'a> Parser<'a> {
         let mut where_clause = WhereClause {
             id: ast::DUMMY_NODE_ID,
             predicates: Vec::new(),
-            span: syntax_pos::DUMMY_SP,
+            span: DUMMY_SP,
         };
 
         if !self.eat_keyword(kw::Where) {
@@ -7005,7 +6969,7 @@ impl<'a> Parser<'a> {
                             Ident::with_empty_ctxt(sym::warn_directory_ownership)),
                         tokens: TokenStream::empty(),
                         is_sugared_doc: false,
-                        span: syntax_pos::DUMMY_SP,
+                        span: DUMMY_SP,
                     };
                     attr::mark_known(&attr);
                     attrs.push(attr);
@@ -7013,7 +6977,7 @@ impl<'a> Parser<'a> {
                 Ok((id, ItemKind::Mod(module), Some(attrs)))
             } else {
                 let placeholder = ast::Mod {
-                    inner: syntax_pos::DUMMY_SP,
+                    inner: DUMMY_SP,
                     items: Vec::new(),
                     inline: false
                 };

src/libsyntax_ext/asm.rs

@@ -138,7 +138,11 @@ fn parse_inline_asm<'a>(
                 if p2.token != token::Eof {
                     let mut extra_tts = p2.parse_all_token_trees()?;
                     extra_tts.extend(tts[first_colon..].iter().cloned());
-                    p = parse::stream_to_parser(cx.parse_sess, extra_tts.into_iter().collect());
+                    p = parse::stream_to_parser(
+                        cx.parse_sess,
+                        extra_tts.into_iter().collect(),
+                        Some("inline assembly"),
+                    );
                 }
 
                 asm = s;

src/libsyntax_ext/deriving/custom.rs

@@ -89,7 +89,7 @@ impl MultiItemModifier for ProcMacroDerive {
         let error_count_before = ecx.parse_sess.span_diagnostic.err_count();
         let msg = "proc-macro derive produced unparseable tokens";
 
-        let mut parser = parse::stream_to_parser(ecx.parse_sess, stream);
+        let mut parser = parse::stream_to_parser(ecx.parse_sess, stream, Some("proc-macro derive"));
         let mut items = vec![];
 
         loop {

src/libtest/lib.rs

@@ -22,7 +22,6 @@
 #![unstable(feature = "test", issue = "27812")]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/", test(attr(deny(warnings))))]
 #![feature(asm)]
-#![feature(fnbox)]
 #![cfg_attr(any(unix, target_os = "cloudabi"), feature(libc, rustc_private))]
 #![feature(nll)]
 #![feature(set_stdio)]
@@ -56,7 +55,6 @@ pub use self::TestResult::*;
 
 use std::any::Any;
 use std::borrow::Cow;
-use std::boxed::FnBox;
 use std::cmp;
 use std::collections::BTreeMap;
 use std::env;
@@ -174,7 +172,7 @@ pub trait TDynBenchFn: Send {
 pub enum TestFn {
     StaticTestFn(fn()),
     StaticBenchFn(fn(&mut Bencher)),
-    DynTestFn(Box<dyn FnBox() + Send>),
+    DynTestFn(Box<dyn FnOnce() + Send>),
     DynBenchFn(Box<dyn TDynBenchFn + 'static>),
 }
 
@@ -1447,7 +1445,7 @@ pub fn run_test(
         desc: TestDesc,
         monitor_ch: Sender<MonitorMsg>,
         nocapture: bool,
-        testfn: Box<dyn FnBox() + Send>,
+        testfn: Box<dyn FnOnce() + Send>,
         concurrency: Concurrent,
     ) {
         // Buffer for capturing standard I/O

src/test/run-pass/unsized-locals/fnbox-compat.rs

@@ -1,4 +1,5 @@
 #![feature(fnbox)]
+#![allow(deprecated, deprecated_in_future)]
 
 use std::boxed::FnBox;
 

src/test/ui/async-await/async-await.rs

@@ -1,3 +1,5 @@
+// run-pass
+
 // edition:2018
 // aux-build:arc_wake.rs
 

src/test/ui/async-await/await-macro.rs

@@ -1,3 +1,5 @@
+// run-pass
+
 // edition:2018
 // aux-build:arc_wake.rs
 

src/test/ui/async-await/drop-order/auxiliary/arc_wake.rs

@@ -0,0 +1,64 @@
+// edition:2018
+
+use std::sync::Arc;
+use std::task::{
+    Waker, RawWaker, RawWakerVTable,
+};
+
+macro_rules! waker_vtable {
+    ($ty:ident) => {
+        &RawWakerVTable::new(
+            clone_arc_raw::<$ty>,
+            wake_arc_raw::<$ty>,
+            wake_by_ref_arc_raw::<$ty>,
+            drop_arc_raw::<$ty>,
+        )
+    };
+}
+
+pub trait ArcWake {
+    fn wake(self: Arc<Self>);
+
+    fn wake_by_ref(arc_self: &Arc<Self>) {
+        arc_self.clone().wake()
+    }
+
+    fn into_waker(wake: Arc<Self>) -> Waker where Self: Sized
+    {
+        let ptr = Arc::into_raw(wake) as *const ();
+
+        unsafe {
+            Waker::from_raw(RawWaker::new(ptr, waker_vtable!(Self)))
+        }
+    }
+}
+
+unsafe fn increase_refcount<T: ArcWake>(data: *const ()) {
+    // Retain Arc by creating a copy
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    let arc_clone = arc.clone();
+    // Forget the Arcs again, so that the refcount isn't decrased
+    let _ = Arc::into_raw(arc);
+    let _ = Arc::into_raw(arc_clone);
+}
+
+unsafe fn clone_arc_raw<T: ArcWake>(data: *const ()) -> RawWaker {
+    increase_refcount::<T>(data);
+    RawWaker::new(data, waker_vtable!(T))
+}
+
+unsafe fn drop_arc_raw<T: ArcWake>(data: *const ()) {
+    // Drop Arc
+    let _: Arc<T> = Arc::from_raw(data as *const T);
+}
+
+unsafe fn wake_arc_raw<T: ArcWake>(data: *const ()) {
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    ArcWake::wake(arc);
+}
+
+unsafe fn wake_by_ref_arc_raw<T: ArcWake>(data: *const ()) {
+    let arc: Arc<T> = Arc::from_raw(data as *const T);
+    ArcWake::wake_by_ref(&arc);
+    let _ = Arc::into_raw(arc);
+}

src/test/ui/async-await/issues/issue-54752-async-block.rs

@@ -1,7 +1,9 @@
-#![feature(async_await)]
+// run-pass
-#![allow(unused_parens)]
 
 // edition:2018
 // pp-exact
 
+#![feature(async_await)]
+#![allow(unused_parens)]
+
 fn main() { let _a = (async  { }); }

src/test/ui/async-await/issues/issue-59972.rs

@@ -1,3 +1,5 @@
+// run-pass
+
 // compile-flags: --edition=2018
 
 #![feature(async_await, await_macro)]

src/test/ui/confuse-field-and-method/issue-2392.rs

@@ -1,7 +1,3 @@
-#![feature(core, fnbox)]
-
-use std::boxed::FnBox;
-
 struct FuncContainer {
     f1: fn(data: u8),
     f2: extern "C" fn(data: u8),
@@ -18,7 +14,7 @@ struct Obj<F> where F: FnOnce() -> u32 {
 }
 
 struct BoxedObj {
-    boxed_closure: Box<FnBox() -> u32>,
+    boxed_closure: Box<FnOnce() -> u32>,
 }
 
 struct Wrapper<F> where F: FnMut() -> u32 {
@@ -29,8 +25,8 @@ fn func() -> u32 {
     0
 }
 
-fn check_expression() -> Obj<Box<FnBox() -> u32>> {
+fn check_expression() -> Obj<Box<FnOnce() -> u32>> {
-    Obj { closure: Box::new(|| 42_u32) as Box<FnBox() -> u32>, not_closure: 42 }
+    Obj { closure: Box::new(|| 42_u32) as Box<FnOnce() -> u32>, not_closure: 42 }
 }
 
 fn main() {
@@ -48,7 +44,7 @@ fn main() {
     let boxed_fn = BoxedObj { boxed_closure: Box::new(func) };
     boxed_fn.boxed_closure();//~ ERROR no method named `boxed_closure` found
 
-    let boxed_closure = BoxedObj { boxed_closure: Box::new(|| 42_u32) as Box<FnBox() -> u32> };
+    let boxed_closure = BoxedObj { boxed_closure: Box::new(|| 42_u32) as Box<FnOnce() -> u32> };
     boxed_closure.boxed_closure();//~ ERROR no method named `boxed_closure` found
 
     // test expression writing in the notes

src/test/ui/confuse-field-and-method/issue-2392.stderr

@@ -1,5 +1,5 @@
-error[E0599]: no method named `closure` found for type `Obj<[closure@$DIR/issue-2392.rs:39:36: 39:41]>` in the current scope
+error[E0599]: no method named `closure` found for type `Obj<[closure@$DIR/issue-2392.rs:35:36: 35:41]>` in the current scope
-  --> $DIR/issue-2392.rs:40:15
+  --> $DIR/issue-2392.rs:36:15
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `closure` not found for this
@@ -11,8 +11,8 @@ help: to call the function stored in `closure`, surround the field access with p
 LL |     (o_closure.closure)();
    |     ^                 ^
 
-error[E0599]: no method named `not_closure` found for type `Obj<[closure@$DIR/issue-2392.rs:39:36: 39:41]>` in the current scope
+error[E0599]: no method named `not_closure` found for type `Obj<[closure@$DIR/issue-2392.rs:35:36: 35:41]>` in the current scope
-  --> $DIR/issue-2392.rs:42:15
+  --> $DIR/issue-2392.rs:38:15
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `not_closure` not found for this
@@ -23,7 +23,7 @@ LL |     o_closure.not_closure();
    |               field, not a method
 
 error[E0599]: no method named `closure` found for type `Obj<fn() -> u32 {func}>` in the current scope
-  --> $DIR/issue-2392.rs:46:12
+  --> $DIR/issue-2392.rs:42:12
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `closure` not found for this
@@ -36,7 +36,7 @@ LL |     (o_func.closure)();
    |     ^              ^
 
 error[E0599]: no method named `boxed_closure` found for type `BoxedObj` in the current scope
-  --> $DIR/issue-2392.rs:49:14
+  --> $DIR/issue-2392.rs:45:14
    |
 LL | struct BoxedObj {
    | --------------- method `boxed_closure` not found for this
@@ -49,7 +49,7 @@ LL |     (boxed_fn.boxed_closure)();
    |     ^                      ^
 
 error[E0599]: no method named `boxed_closure` found for type `BoxedObj` in the current scope
-  --> $DIR/issue-2392.rs:52:19
+  --> $DIR/issue-2392.rs:48:19
    |
 LL | struct BoxedObj {
    | --------------- method `boxed_closure` not found for this
@@ -62,7 +62,7 @@ LL |     (boxed_closure.boxed_closure)();
    |     ^                           ^
 
 error[E0599]: no method named `closure` found for type `Obj<fn() -> u32 {func}>` in the current scope
-  --> $DIR/issue-2392.rs:57:12
+  --> $DIR/issue-2392.rs:53:12
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `closure` not found for this
@@ -75,7 +75,7 @@ LL |     (w.wrap.closure)();
    |     ^              ^
 
 error[E0599]: no method named `not_closure` found for type `Obj<fn() -> u32 {func}>` in the current scope
-  --> $DIR/issue-2392.rs:59:12
+  --> $DIR/issue-2392.rs:55:12
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `not_closure` not found for this
@@ -85,8 +85,8 @@ LL |     w.wrap.not_closure();
    |            |
    |            field, not a method
 
-error[E0599]: no method named `closure` found for type `Obj<std::boxed::Box<(dyn std::boxed::FnBox<(), Output = u32> + 'static)>>` in the current scope
+error[E0599]: no method named `closure` found for type `Obj<std::boxed::Box<(dyn std::ops::FnOnce() -> u32 + 'static)>>` in the current scope
-  --> $DIR/issue-2392.rs:62:24
+  --> $DIR/issue-2392.rs:58:24
    |
 LL | struct Obj<F> where F: FnOnce() -> u32 {
    | -------------------------------------- method `closure` not found for this
@@ -99,7 +99,7 @@ LL |     (check_expression().closure)();
    |     ^                          ^
 
 error[E0599]: no method named `f1` found for type `FuncContainer` in the current scope
-  --> $DIR/issue-2392.rs:68:31
+  --> $DIR/issue-2392.rs:64:31
    |
 LL | struct FuncContainer {
    | -------------------- method `f1` not found for this
@@ -112,7 +112,7 @@ LL |             ((*self.container).f1)(1);
    |             ^                    ^
 
 error[E0599]: no method named `f2` found for type `FuncContainer` in the current scope
-  --> $DIR/issue-2392.rs:69:31
+  --> $DIR/issue-2392.rs:65:31
    |
 LL | struct FuncContainer {
    | -------------------- method `f2` not found for this
@@ -125,7 +125,7 @@ LL |             ((*self.container).f2)(1);
    |             ^                    ^
 
 error[E0599]: no method named `f3` found for type `FuncContainer` in the current scope
-  --> $DIR/issue-2392.rs:70:31
+  --> $DIR/issue-2392.rs:66:31
    |
 LL | struct FuncContainer {
    | -------------------- method `f3` not found for this