Rollup of 10 pull requests

RELEASES.md

@@ -1,3 +1,131 @@
+Version 1.49.0 (2020-12-31)
+============================
+
+Language
+-----------------------
+
+- [Unions can now implement `Drop`, and you can now have a field in a union
+  with `ManuallyDrop<T>`.][77547]
+- [You can now cast uninhabited enums to integers.][76199]
+- [You can now bind by reference and by move in patterns.][76119] This
+  allows you to selectively borrow individual components of a type. E.g.
+  ```rust
+  #[derive(Debug)]
+  struct Person {
+      name: String,
+      age: u8,
+  }
+
+  let person = Person {
+      name: String::from("Alice"),
+      age: 20,
+  };
+
+  // `name` is moved out of person, but `age` is referenced.
+  let Person { name, ref age } = person;
+  println!("{} {}", name, age);
+  ```
+
+Compiler
+-----------------------
+
+- [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
+- [Added tier 2 support for `aarch64-apple-darwin`.][75991]
+- [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
+- [Added tier 3 support for `mipsel-unknown-none`.][78676]
+- [Raised the minimum supported LLVM version to LLVM 9.][78848]
+- [Output from threads spawned in tests is now captured.][78227]
+- [Change os and vendor values to "none" and "unknown" for some targets][78951]
+
+\* Refer to Rust's [platform support page][forge-platform-support] for more
+information on Rust's tiered platform support.
+
+Libraries
+-----------------------
+
+- [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109]
+- [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997]
+- [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989]
+
+Stabilized APIs
+---------------
+
+- [`slice::select_nth_unstable`]
+- [`slice::select_nth_unstable_by`]
+- [`slice::select_nth_unstable_by_key`]
+
+The following previously stable methods are now `const`.
+
+- [`Poll::is_ready`]
+- [`Poll::is_pending`]
+
+Cargo
+-----------------------
+- [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864]
+- [`cargo-tree` now marks proc-macro crates.][cargo/8765]
+- [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.][cargo/8758] This
+  variable will be set if the crate being built is one the user selected to build, either
+  with `-p` or through defaults.
+- [You can now use glob patterns when specifying packages & targets.][cargo/8752]
+
+
+Compatibility Notes
+-------------------
+
+- [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746]
+- [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376]
+- [Rustc will now check for the validity of some built-in attributes on enum variants.][77015]
+  Previously such invalid or unused attributes could be ignored.
+- Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You
+  read [this post about the changes][rustdoc-ws-post] for more details.
+- [Trait bounds are no longer inferred for associated types.][79904]
+
+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.
+
+- [rustc's internal crates are now compiled using the `initial-exec` Thread
+  Local Storage model.][78201]
+- [Calculate visibilities once in resolve.][78077]
+- [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
+- [Added `--color` for configuring terminal color support to bootstrap.][79004]
+
+
+[75991]: https://github.com/rust-lang/rust/pull/75991
+[78951]: https://github.com/rust-lang/rust/pull/78951
+[78848]: https://github.com/rust-lang/rust/pull/78848
+[78746]: https://github.com/rust-lang/rust/pull/78746
+[78376]: https://github.com/rust-lang/rust/pull/78376
+[78228]: https://github.com/rust-lang/rust/pull/78228
+[78227]: https://github.com/rust-lang/rust/pull/78227
+[78201]: https://github.com/rust-lang/rust/pull/78201
+[78109]: https://github.com/rust-lang/rust/pull/78109
+[78077]: https://github.com/rust-lang/rust/pull/78077
+[77997]: https://github.com/rust-lang/rust/pull/77997
+[77703]: https://github.com/rust-lang/rust/pull/77703
+[77547]: https://github.com/rust-lang/rust/pull/77547
+[77015]: https://github.com/rust-lang/rust/pull/77015
+[76199]: https://github.com/rust-lang/rust/pull/76199
+[76119]: https://github.com/rust-lang/rust/pull/76119
+[75914]: https://github.com/rust-lang/rust/pull/75914
+[74989]: https://github.com/rust-lang/rust/pull/74989
+[79004]: https://github.com/rust-lang/rust/pull/79004
+[78676]: https://github.com/rust-lang/rust/pull/78676
+[79904]: https://github.com/rust-lang/rust/issues/79904
+[cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
+[cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
+[cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
+[cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
+[`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
+[`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
+[`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
+[`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
+[`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
+[`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
+[rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
+
 Version 1.48.0 (2020-11-19)
 ==========================
 
@@ -10,7 +138,7 @@ Language
 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 
+  `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.
@@ -82,7 +210,7 @@ Compatibility Notes
 - [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
@@ -102,7 +230,7 @@ related tools.
 [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/  
+[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/

compiler/rustc_ast/src/ast.rs

@@ -167,10 +167,7 @@ pub enum GenericArgs {
 
 impl GenericArgs {
     pub fn is_angle_bracketed(&self) -> bool {
-        match *self {
-            AngleBracketed(..) => true,
-            _ => false,
-        }
+        matches!(self, AngleBracketed(..))
     }
 
     pub fn span(&self) -> Span {
@@ -629,10 +626,7 @@ impl Pat {
 
     /// Is this a `..` pattern?
     pub fn is_rest(&self) -> bool {
-        match self.kind {
-            PatKind::Rest => true,
-            _ => false,
-        }
+        matches!(self.kind, PatKind::Rest)
     }
 }
 
@@ -852,10 +846,7 @@ impl BinOpKind {
         }
     }
     pub fn lazy(&self) -> bool {
-        match *self {
-            BinOpKind::And | BinOpKind::Or => true,
-            _ => false,
-        }
+        matches!(self, BinOpKind::And | BinOpKind::Or)
     }
 
     pub fn is_comparison(&self) -> bool {
@@ -963,17 +954,11 @@ impl Stmt {
     }
 
     pub fn is_item(&self) -> bool {
-        match self.kind {
-            StmtKind::Item(_) => true,
-            _ => false,
-        }
+        matches!(self.kind, StmtKind::Item(_))
     }
 
     pub fn is_expr(&self) -> bool {
-        match self.kind {
-            StmtKind::Expr(_) => true,
-            _ => false,
-        }
+        matches!(self.kind, StmtKind::Expr(_))
     }
 }
 
@@ -1652,26 +1637,17 @@ pub enum LitKind {
 impl LitKind {
     /// Returns `true` if this literal is a string.
     pub fn is_str(&self) -> bool {
-        match *self {
-            LitKind::Str(..) => true,
-            _ => false,
-        }
+        matches!(self, LitKind::Str(..))
     }
 
     /// Returns `true` if this literal is byte literal string.
     pub fn is_bytestr(&self) -> bool {
-        match self {
-            LitKind::ByteStr(_) => true,
-            _ => false,
-        }
+        matches!(self, LitKind::ByteStr(_))
     }
 
     /// Returns `true` if this is a numeric literal.
     pub fn is_numeric(&self) -> bool {
-        match *self {
-            LitKind::Int(..) | LitKind::Float(..) => true,
-            _ => false,
-        }
+        matches!(self, LitKind::Int(..) | LitKind::Float(..))
     }
 
     /// Returns `true` if this literal has no suffix.
@@ -2237,10 +2213,7 @@ impl FnDecl {
         self.inputs.get(0).map_or(false, Param::is_self)
     }
     pub fn c_variadic(&self) -> bool {
-        self.inputs.last().map_or(false, |arg| match arg.ty.kind {
-            TyKind::CVarArgs => true,
-            _ => false,
-        })
+        self.inputs.last().map_or(false, |arg| matches!(arg.ty.kind, TyKind::CVarArgs))
     }
 }
 

compiler/rustc_ast/src/attr/mod.rs

@@ -234,10 +234,7 @@ impl MetaItem {
     }
 
     pub fn is_word(&self) -> bool {
-        match self.kind {
-            MetaItemKind::Word => true,
-            _ => false,
-        }
+        matches!(self.kind, MetaItemKind::Word)
     }
 
     pub fn has_name(&self, name: Symbol) -> bool {

compiler/rustc_ast/src/token.rs

@@ -130,10 +130,7 @@ impl LitKind {
     }
 
     crate fn may_have_suffix(self) -> bool {
-        match self {
-            Integer | Float | Err => true,
-            _ => false,
-        }
+        matches!(self, Integer | Float | Err)
     }
 }
 
@@ -305,10 +302,7 @@ impl TokenKind {
     }
 
     pub fn should_end_const_arg(&self) -> bool {
-        match self {
-            Gt | Ge | BinOp(Shr) | BinOpEq(Shr) => true,
-            _ => false,
-        }
+        matches!(self, Gt | Ge | BinOp(Shr) | BinOpEq(Shr))
     }
 }
 
@@ -346,18 +340,21 @@ impl Token {
     }
 
     pub fn is_op(&self) -> bool {
-        match self.kind {
-            OpenDelim(..) | CloseDelim(..) | Literal(..) | DocComment(..) | Ident(..)
-            | Lifetime(..) | Interpolated(..) | Eof => false,
-            _ => true,
-        }
+        !matches!(
+            self.kind,
+            OpenDelim(..)
+                | CloseDelim(..)
+                | Literal(..)
+                | DocComment(..)
+                | Ident(..)
+                | Lifetime(..)
+                | Interpolated(..)
+                | Eof
+        )
     }
 
     pub fn is_like_plus(&self) -> bool {
-        match self.kind {
-            BinOp(Plus) | BinOpEq(Plus) => true,
-            _ => false,
-        }
+        matches!(self.kind, BinOp(Plus) | BinOpEq(Plus))
     }
 
     /// Returns `true` if the token can appear at the start of an expression.
@@ -379,13 +376,10 @@ impl Token {
             ModSep                            | // global path
             Lifetime(..)                      | // labeled loop
             Pound                             => true, // expression attributes
-            Interpolated(ref nt) => match **nt {
-                NtLiteral(..) |
+            Interpolated(ref nt) => matches!(**nt, NtLiteral(..) |
                 NtExpr(..)    |
                 NtBlock(..)   |
-                NtPath(..) => true,
-                _ => false,
-            },
+                NtPath(..)),
             _ => false,
         }
     }
@@ -405,10 +399,7 @@ impl Token {
             Lifetime(..)                | // lifetime bound in trait object
             Lt | BinOp(Shl)             | // associated path
             ModSep                      => true, // global path
-            Interpolated(ref nt) => match **nt {
-                NtTy(..) | NtPath(..) => true,
-                _ => false,
-            },
+            Interpolated(ref nt) => matches!(**nt, NtTy(..) | NtPath(..)),
             _ => false,
         }
     }
@@ -417,10 +408,7 @@ impl Token {
     pub fn can_begin_const_arg(&self) -> bool {
         match self.kind {
             OpenDelim(Brace) => true,
-            Interpolated(ref nt) => match **nt {
-                NtExpr(..) | NtBlock(..) | NtLiteral(..) => true,
-                _ => false,
-            },
+            Interpolated(ref nt) => matches!(**nt, NtExpr(..) | NtBlock(..) | NtLiteral(..)),
             _ => self.can_begin_literal_maybe_minus(),
         }
     }
@@ -436,10 +424,7 @@ impl Token {
 
     /// Returns `true` if the token is any literal.
     pub fn is_lit(&self) -> bool {
-        match self.kind {
-            Literal(..) => true,
-            _ => false,
-        }
+        matches!(self.kind, Literal(..))
     }
 
     /// Returns `true` if the token is any literal, a minus (which can prefix a literal,

compiler/rustc_ast/src/util/classify.rs

@@ -12,14 +12,14 @@ use crate::ast;
 ///      |x| 5
 /// isn't parsed as (if true {...} else {...} | x) | 5
 pub fn expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool {
-    match e.kind {
+    !matches!(
+        e.kind,
         ast::ExprKind::If(..)
-        | ast::ExprKind::Match(..)
-        | ast::ExprKind::Block(..)
-        | ast::ExprKind::While(..)
-        | ast::ExprKind::Loop(..)
-        | ast::ExprKind::ForLoop(..)
-        | ast::ExprKind::TryBlock(..) => false,
-        _ => true,
-    }
+            | ast::ExprKind::Match(..)
+            | ast::ExprKind::Block(..)
+            | ast::ExprKind::While(..)
+            | ast::ExprKind::Loop(..)
+            | ast::ExprKind::ForLoop(..)
+            | ast::ExprKind::TryBlock(..)
+    )
 }