sync upstream

.gitattributes

@@ -5,6 +5,7 @@
 *.h rust
 *.rs rust diff=rust
 *.fixed linguist-language=Rust
+*.mir linguist-language=Rust
 src/etc/installer/gfx/* binary
 *.woff binary
 src/vendor/** -text

.mailmap

@@ -148,6 +148,7 @@ Jorge Aparicio <[email protected]> <[email protected]>
 Joseph Martin <[email protected]>
 Joseph T. Lyons <[email protected]> <[email protected]>
 Joseph T. Lyons <[email protected]> <[email protected]>
+Joshua Nelson <[email protected]> <[email protected]>
 jumbatm <[email protected]> <[email protected]>
 Junyoung Cho <[email protected]>
 Jyun-Yan You <[email protected]> <[email protected]>

Cargo.lock

@@ -2,9 +2,9 @@
 # It is not intended for manual editing.
 [[package]]
 name = "addr2line"
-version = "0.13.0"
+version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b6a2d3371669ab3ca9797670853d61402b03d0b4b9ebf33d677dfa720203072"
+checksum = "7c0929d69e78dd9bf5408269919fcbcaeb2e35e5d43e5815517cdc6a8e11a423"
 dependencies = [
  "compiler_builtins",
  "gimli",
@@ -132,13 +132,13 @@ checksum = "f8aac770f1885fd7e387acedd76065302551364496e46b3dd00860b2f8359b9d"
 
 [[package]]
 name = "backtrace"
-version = "0.3.53"
+version = "0.3.55"
 dependencies = [
  "addr2line",
  "cfg-if 1.0.0",
  "libc",
  "miniz_oxide",
- "object 0.21.1",
+ "object",
  "rustc-demangle",
 ]
 
@@ -470,9 +470,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chalk-derive"
-version = "0.32.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2d072b2ba723f0bada7c515d8b3725224bc4f5052d2a92dcbeb0b118ff37084a"
+checksum = "9f88ce4deae1dace71e49b7611cfae2d5489de3530d6daba5758043c47ac3a10"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -482,9 +482,9 @@ dependencies = [
 
 [[package]]
 name = "chalk-engine"
-version = "0.32.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6fb5475f6083d6d6c509e1c335c4f69ad04144ac090faa1afb134a53c3695841"
+checksum = "0e34c9b1b10616782143d7f49490f91ae94afaf2202de3ab0b2835e78b4f0ccc"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -495,19 +495,19 @@ dependencies = [
 
 [[package]]
 name = "chalk-ir"
-version = "0.32.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f60cdb0e18c5455cb6a85e8464aad3622b70476018edfa8845691df66f7e9a05"
+checksum = "63362c629c2014ab639b04029070763fb8224df136d1363d30e9ece4c8877da3"
 dependencies = [
  "chalk-derive",
  "lazy_static",
 ]
 
 [[package]]
 name = "chalk-solve"
-version = "0.32.0"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "981534d499a8476ecc0b520be4d3864757f96211826a75360fbf2cb6fae362ab"
+checksum = "cac338a67af52a7f50bb2f8232e730a3518ce432dbe303246acfe525ddd838c7"
 dependencies = [
  "chalk-derive",
  "chalk-ir",
@@ -731,6 +731,13 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a21fa21941700a3cd8fcb4091f361a6a712fac632f85d9f487cc892045d55c6"
 
+[[package]]
+name = "coverage_test_macros"
+version = "0.0.0"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "cpuid-bool"
 version = "0.1.2"
@@ -990,9 +997,9 @@ dependencies = [
 
 [[package]]
 name = "dlmalloc"
-version = "0.1.4"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "35055b1021724f4eb5262eb49130eebff23fc59fc5a14160e05faad8eeb36673"
+checksum = "332570860c2edf2d57914987bf9e24835425f75825086b6ba7d1e6a3e4f1f254"
 dependencies = [
  "compiler_builtins",
  "libc",
@@ -1301,9 +1308,9 @@ dependencies = [
 
 [[package]]
 name = "gimli"
-version = "0.22.0"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aaf91faf136cb47367fa430cd46e37a788775e7fa104f8b4bcb3861dc389b724"
+checksum = "f6503fe142514ca4799d4c26297c4248239fe8838d827db6bd6065c6ed29a6ce"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
@@ -2190,21 +2197,15 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.20.0"
+version = "0.22.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ab52be62400ca80aa00285d25253d7f7c437b7375c4de678f5405d3afe82ca5"
+checksum = "8d3b63360ec3cb337817c2dbd47ab4a0f170d285d8e5a2064600f3def1402397"
 dependencies = [
  "compiler_builtins",
  "rustc-std-workspace-alloc",
  "rustc-std-workspace-core",
 ]
 
-[[package]]
-name = "object"
-version = "0.21.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37fd5004feb2ce328a52b0b3d01dbf4ffff72583493900ed15f22d4111c51693"
-
 [[package]]
 name = "once_cell"
 version = "1.4.1"
@@ -3032,6 +3033,7 @@ name = "rustbook"
 version = "0.1.0"
 dependencies = [
  "clap",
+ "env_logger 0.7.1",
  "mdbook",
 ]
 
@@ -3813,7 +3815,7 @@ dependencies = [
  "rustc_target",
  "rustc_trait_selection",
  "rustc_traits",
- "rustc_ty",
+ "rustc_ty_utils",
  "rustc_typeck",
  "smallvec 1.4.2",
  "tempfile",
@@ -3842,6 +3844,7 @@ dependencies = [
  "rustc_hir",
  "rustc_index",
  "rustc_middle",
+ "rustc_parse_format",
  "rustc_session",
  "rustc_span",
  "rustc_target",
@@ -3941,6 +3944,7 @@ dependencies = [
 name = "rustc_mir"
 version = "0.0.0"
 dependencies = [
+ "coverage_test_macros",
  "either",
  "itertools 0.9.0",
  "polonius-engine",
@@ -4250,7 +4254,7 @@ dependencies = [
 ]
 
 [[package]]
-name = "rustc_ty"
+name = "rustc_ty_utils"
 version = "0.0.0"
 dependencies = [
  "rustc_data_structures",
@@ -4348,7 +4352,7 @@ dependencies = [
 
 [[package]]
 name = "rustfmt-nightly"
-version = "1.4.24"
+version = "1.4.27"
 dependencies = [
  "annotate-snippets 0.6.1",
  "anyhow",
@@ -4677,7 +4681,7 @@ dependencies = [
  "hermit-abi",
  "libc",
  "miniz_oxide",
- "object 0.20.0",
+ "object",
  "panic_abort",
  "panic_unwind",
  "profiler_builtins",

RELEASES.md

@@ -1,3 +1,143 @@
+Version 1.48.0 (2020-11-19)
+==========================
+
+Language
+--------
+
+- [The `unsafe` keyword is now syntactically permitted on modules.][75857] This
+  is still rejected *semantically*, but can now be parsed by procedural macros.
+
+Compiler
+--------
+- [Stabilised the `-C link-self-contained=<yes|no>` compiler flag.][76158] This tells
+  `rustc` whether to link its own C runtime and libraries or to rely on a external 
+  linker to find them. (Supported only on `windows-gnu`, `linux-musl`, and `wasi` platforms.)
+- [You can now use `-C target-feature=+crt-static` on `linux-gnu` targets.][77386]
+  Note: If you're using cargo you must explicitly pass the `--target` flag.
+- [Added tier 2\* support for `aarch64-unknown-linux-musl`.][76420]
+
+\* Refer to Rust's [platform support page][forge-platform-support] for more
+information on Rust's tiered platform support.
+
+Libraries
+---------
+- [`io::Write` is now implemented for `&ChildStdin` `&Sink`, `&Stdout`,
+  and `&Stderr`.][76275]
+- [All arrays of any length now implement `TryFrom<Vec<T>>`.][76310]
+- [The `matches!` macro now supports having a trailing comma.][74880]
+- [`Vec<A>` now implements `PartialEq<[B]>` where `A: PartialEq<B>`.][74194]
+- [The `RefCell::{replace, replace_with, clone}` methods now all use `#[track_caller]`.][77055]
+
+Stabilized APIs
+---------------
+- [`slice::as_ptr_range`]
+- [`slice::as_mut_ptr_range`]
+- [`VecDeque::make_contiguous`]
+- [`future::pending`]
+- [`future::ready`]
+
+The following previously stable methods are now `const fn`'s:
+
+- [`Option::is_some`]
+- [`Option::is_none`]
+- [`Option::as_ref`]
+- [`Result::is_ok`]
+- [`Result::is_err`]
+- [`Result::as_ref`]
+- [`Ordering::reverse`]
+- [`Ordering::then`]
+
+Cargo
+-----
+
+Rustdoc
+-------
+- [You can now link to items in `rustdoc` using the intra-doc link
+  syntax.][74430] E.g. ``/// Uses [`std::future`]`` will automatically generate
+  a link to `std::future`'s documentation. See ["Linking to items by
+  name"][intradoc-links] for more information.
+- [You can now specify `#[doc(alias = "<alias>")]` on items to add search aliases
+  when searching through `rustdoc`'s UI.][75740]
+
+Compatibility Notes
+-------------------
+- [Promotion of references to `'static` lifetime inside `const fn` now follows the
+  same rules as inside a `fn` body.][75502] In particular, `&foo()` will not be
+  promoted to `'static` lifetime any more inside `const fn`s.
+- [Associated type bindings on trait objects are now verified to meet the bounds
+  declared on the trait when checking that they implement the trait.][27675]
+- [When trait bounds on associated types or opaque types are ambiguous, the
+  compiler no longer makes an arbitrary choice on which bound to use.][54121]
+- [Fixed recursive nonterminals not being expanded in macros during
+  pretty-print/reparse check.][77153] This may cause errors if your macro wasn't
+  correctly handling recursive nonterminal tokens.
+- [`&mut` references to non zero-sized types are no longer promoted.][75585]
+- [`rustc` will now warn if you use attributes like `#[link_name]` or `#[cold]`
+  in places where they have no effect.][73461]
+- [Updated `_mm256_extract_epi8` and `_mm256_extract_epi16` signatures in
+  `arch::{x86, x86_64}` to return `i32` to match the vendor signatures.][73166]
+- [`mem::uninitialized` will now panic if any inner types inside a struct or enum
+  disallow zero-initialization.][71274]
+- [`#[target_feature]` will now error if used in a place where it has no effect.][78143]
+- [Foreign exceptions are now caught by `catch_unwind` and will cause an abort.][70212]
+  Note: This behaviour is not guaranteed and is still considered undefined behaviour,
+  see the [`catch_unwind`] documentation for further information.
+
+
+
+Internal Only
+-------------
+These changes provide no direct user facing benefits, but represent significant
+improvements to the internals and overall performance of rustc and
+related tools.
+
+- [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
+  You can continue building with `make` by setting `ninja=false` in
+  your `config.toml`.
+- [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
+- [Made `ensure_sufficient_stack()` non-generic][76680]
+
+[78143]: https://github.com/rust-lang/rust/issues/78143
+[76680]: https://github.com/rust-lang/rust/pull/76680/
+[76030]: https://github.com/rust-lang/rust/pull/76030/
+[70212]: https://github.com/rust-lang/rust/pull/70212/
+[27675]: https://github.com/rust-lang/rust/issues/27675/
+[54121]: https://github.com/rust-lang/rust/issues/54121/  
+[71274]: https://github.com/rust-lang/rust/pull/71274/
+[77386]: https://github.com/rust-lang/rust/pull/77386/
+[77153]: https://github.com/rust-lang/rust/pull/77153/
+[77055]: https://github.com/rust-lang/rust/pull/77055/
+[76275]: https://github.com/rust-lang/rust/pull/76275/
+[76310]: https://github.com/rust-lang/rust/pull/76310/
+[76420]: https://github.com/rust-lang/rust/pull/76420/
+[76158]: https://github.com/rust-lang/rust/pull/76158/
+[75857]: https://github.com/rust-lang/rust/pull/75857/
+[75585]: https://github.com/rust-lang/rust/pull/75585/
+[75740]: https://github.com/rust-lang/rust/pull/75740/
+[75502]: https://github.com/rust-lang/rust/pull/75502/
+[74880]: https://github.com/rust-lang/rust/pull/74880/
+[74922]: https://github.com/rust-lang/rust/pull/74922/
+[74430]: https://github.com/rust-lang/rust/pull/74430/
+[74194]: https://github.com/rust-lang/rust/pull/74194/
+[73461]: https://github.com/rust-lang/rust/pull/73461/
+[73166]: https://github.com/rust-lang/rust/pull/73166/
+[intradoc-links]: https://doc.rust-lang.org/rustdoc/linking-to-items-by-name.html
+[`catch_unwind`]: https://doc.rust-lang.org/std/panic/fn.catch_unwind.html
+[`Option::is_some`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some
+[`Option::is_none`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.is_none
+[`Option::as_ref`]: https://doc.rust-lang.org/std/option/enum.Option.html#method.as_ref
+[`Result::is_ok`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_ok
+[`Result::is_err`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err
+[`Result::as_ref`]: https://doc.rust-lang.org/std/result/enum.Result.html#method.as_ref
+[`Ordering::reverse`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.reverse
+[`Ordering::then`]: https://doc.rust-lang.org/std/cmp/enum.Ordering.html#method.then
+[`slice::as_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_ptr_range
+[`slice::as_mut_ptr_range`]: https://doc.rust-lang.org/std/primitive.slice.html#method.as_mut_ptr_range
+[`VecDeque::make_contiguous`]: https://doc.rust-lang.org/std/collections/struct.VecDeque.html#method.make_contiguous
+[`future::pending`]: https://doc.rust-lang.org/std/future/fn.pending.html
+[`future::ready`]: https://doc.rust-lang.org/std/future/fn.ready.html
+
+
 Version 1.47.0 (2020-10-08)
 ==========================
 
@@ -90,6 +230,7 @@ Compatibility Notes
 
 Internal Only
 --------
+
 - [Improved default settings for bootstrapping in `x.py`.][73964] You can read details about this change in the ["Changes to `x.py` defaults"](https://blog.rust-lang.org/inside-rust/2020/08/30/changes-to-x-py-defaults.html) post on the Inside Rust blog.
 
 [1.47.0-cfg]: https://docs.microsoft.com/en-us/windows/win32/secbp/control-flow-guard