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Add lint for copyright headers to 'tidy' tool
r? @Mark-Simulacrum
CC @centril
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Unaccept `extern_in_paths`
Based on completed fcp-close in https://github.com/rust-lang/rust/issues/55600, this removes `extern_in_path` (e.g. `extern::foo::bar`) from the language. The changes are primarily reversing https://github.com/rust-lang/rust/commit/32db83b16e06cb5cca72d0e6a648a8008eda0fac.
Closes https://github.com/rust-lang/rust/issues/55600
r? @petrochenkov
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This stabilises RFC 2086 (https://github.com/rust-lang/rust/issues/44495).
Co-Authored-By: Sebastian Malton <sebastian@malton.name>
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Fill out the borrowck chapter a bit more
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Fix repeated word typos
Inspired by #57295 (I skipped 'be be' because of it) and my [PR in another repo
](https://github.com/e-maxx-eng/e-maxx-eng/pull/389)
Not a stupid `sed`, I actually tried to fix case by case.
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Implement the Re-rebalance coherence RFC
This is the first time I touch anything in the compiler so just tell me if I got something wrong.
Big thanks to @sgrif for the pointers where to look for those things.
cc #55437
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Link to rustc guide
As proposed in https://github.com/rust-lang-nursery/rustc-guide/issues/239
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Co-Authored-By: weiznich <Georg_semmler_05@web.de>
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Found with `git grep -P '\b([a-z]+)\s+\1\b'`
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Someone was asking on Discord what it stands for. It's sometimes used in
GitHub issues, Twitter and other places.
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remove more copyright headers
r? @Mark-Simulacrum
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Implement RFC 2338, "Type alias enum variants"
This PR implements [RFC 2338](https://github.com/rust-lang/rfcs/pull/2338), allowing one to write code like the following.
```rust
#![feature(type_alias_enum_variants)]
enum Foo {
Bar(i32),
Baz { i: i32 },
}
type Alias = Foo;
fn main() {
let t = Alias::Bar(0);
let t = Alias::Baz { i: 0 };
match t {
Alias::Bar(_i) => {}
Alias::Baz { i: _i } => {}
}
}
```
Since `Self` can be considered a type alias in this context, it also enables using `Self::Variant` as both a constructor and pattern.
Fixes issues #56199 and #56611.
N.B., after discussing the syntax for type arguments on enum variants with @petrochenkov and @eddyb (there are also a few comments on the [tracking issue](https://github.com/rust-lang/rust/issues/49683)), the consensus seems to be treat the syntax as follows, which ought to be backwards-compatible.
```rust
Option::<u8>::None; // OK
Option::None::<u8>; // OK, but lint in near future (hard error next edition?)
Alias::<u8>::None; // OK
Alias::None::<u8>; // Error
```
I do not know if this will need an FCP, but let's start one if so.
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Issue #28979 was closed with a link to #55467.
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docs(rustc): make hello() public
Running the example code [here](https://doc.rust-lang.org/rustc/what-is-rustc.html#basic-usage) throws error:
```
error[E0603]: function `hello` is private
--> src/main.rs:4:10
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4 | foo::hello();
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```
Making `hello()` public fixes the problem.
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No idea why the Markdown stuff got dropped last time. Hopefully everything is fine now.
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I based this clarification on this [answer](https://www.reddit.com/r/rust/comments/a8mk33/question_about_a_line_from_the_rust_compiler_book/ecbx1ma/) to
my question on Reddit.
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Stabilize #[repr(packed(N))]
Fixes https://github.com/rust-lang/rust/issues/33158
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Stabilize `linker-flavor` flag.
Part of #55396.
This commit moves the linker-flavor flag from a debugging option to a
codegen option, thus stabilizing it. There are no feature flags
associated with this flag.
r? @nagisa
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This commit moves the linker-flavor flag from a debugging option to a
codegen option, thus stabilizing it. There are no feature flags
associated with this flag.
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Update the book to fix some edition-related bugs
I'd love to have this included in a point release if one happens, but the changes aren't worth doing a point release on their own IMO. I'd definitely like to see this backported to beta.
The most urgent changes included here are:
- Chapter 19.6, on macros (including the macro changes that just stabilized), [is cut off](https://github.com/rust-lang/book/issues/1668) because of an ill-placed newline in a comment that [pulldown-cmark interprets incorrectly](https://github.com/raphlinus/pulldown-cmark/issues/124).
- [The `Cargo.toml` shown in the Guessing Game example in Chapter 2 (and one in Chapter 14) doesn't have `edition="2018"`](https://github.com/rust-lang/book/pull/1671), which can be confusing depending on whether the readers have it in theirs or not, think they should remove it if they have it, and the rest of the chapter assumes it's there and the code doesn't compile if you don't have it.
- The redirects implemented as part of only shipping the 2018 edition of the book sometimes lead to [having to click through 2 redirect pages](https://github.com/rust-lang/book/pull/1667) when it could be just one.
There are other small corrections included that were made since the last time the book was updated, but those aren't urgent.
cc @steveklabnik
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and update it so that links are correct
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