Generalize branch references to HEAD

Author: Kobzol

src/appendix/code-index.md

@@ -12,7 +12,7 @@ Item            |  Kind    | Short description           | Chapter            |
 `rustc_hir::Crate` | struct | A more abstract, compiler-friendly form of a crate's AST | [The Hir] | [compiler/rustc_hir/src/hir.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/hir/struct.Crate.html)
 `DefId` | struct | One of four types of HIR node identifiers | [Identifiers in the HIR] | [compiler/rustc_hir/src/def_id.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/def_id/struct.DefId.html)
 `Diag` | struct | A struct for a compiler diagnostic, such as an error or lint | [Emitting Diagnostics] | [compiler/rustc_errors/src/diagnostic.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_errors/struct.Diag.html)
-`DocContext` | struct | A state container used by rustdoc when crawling through a crate to gather its documentation | [Rustdoc] | [src/librustdoc/core.rs](https://github.com/rust-lang/rust/blob/master/src/librustdoc/core.rs)
+`DocContext` | struct | A state container used by rustdoc when crawling through a crate to gather its documentation | [Rustdoc] | [src/librustdoc/core.rs](https://github.com/rust-lang/rust/blob/HEAD/src/librustdoc/core.rs)
 `HirId` | struct | One of four types of HIR node identifiers | [Identifiers in the HIR] | [compiler/rustc_hir_id/src/lib.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.HirId.html)
 `Lexer` | struct | This is the lexer used during parsing. It consumes characters from the raw source code being compiled and produces a series of tokens for use by the rest of the parser | [The parser] |  [compiler/rustc_parse/src/lexer/mod.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/lexer/struct.Lexer.html)
 `NodeId` | struct | One of four types of HIR node identifiers. Being phased out | [Identifiers in the HIR] | [compiler/rustc_ast/src/ast.rs](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/node_id/struct.NodeId.html)

src/appendix/humorust.md

@@ -3,7 +3,7 @@
 What's a project without a sense of humor? And frankly some of these are
 enlightening?
 
-- [Weird exprs test](https://github.com/rust-lang/rust/blob/master/tests/ui/expr/weird-exprs.rs)
+- [Weird exprs test](https://github.com/rust-lang/rust/blob/HEAD/tests/ui/expr/weird-exprs.rs)
 - [Ferris Rap](https://fitzgen.com/2018/12/13/rust-raps.html)
 - [The Genesis of Generic Germination](https://github.com/rust-lang/rust/pull/53645#issue-210543221)
 - [The Bastion of the Turbofish test](https://github.com/rust-lang/rust/blob/79d8a0fcefa5134db2a94739b1d18daa01fc6e9f/src/test/ui/bastion-of-the-turbofish.rs)

src/attributes.md

@@ -35,7 +35,7 @@ Definitions of non-builtin attributes take two forms:
 2. AST-based attributes, defined in the standard library. These attributes have special 'stub'
    macros defined in places like [`library/core/src/macros/mod.rs`][core_macros].
 
-[core_macros]:  https://github.com/rust-lang/rust/blob/master/library/core/src/macros/mod.rs
+[core_macros]:  https://github.com/rust-lang/rust/blob/HEAD/library/core/src/macros/mod.rs
 
 These definitions exist to allow the macros to participate in typical path-based resolution - they
 can be imported, re-exported, and renamed just like any other item definition. However, the body of

src/backend/updating-llvm.md

@@ -224,7 +224,7 @@ keep in mind while going through them:
 
 [rust-lang/llvm-project repository]: https://github.com/rust-lang/llvm-project
 [llvm/llvm-project repository]: https://github.com/llvm/llvm-project
-[`llvm-wrapper`]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_llvm/llvm-wrapper
+[`llvm-wrapper`]: https://github.com/rust-lang/rust/tree/HEAD/compiler/rustc_llvm/llvm-wrapper
 [wg-llvm]: https://rust-lang.zulipchat.com/#narrow/stream/187780-t-compiler.2Fwg-llvm
 [Dev Desktops]: https://forge.rust-lang.org/infra/docs/dev-desktop.html
 [backport process]: https://llvm.org/docs/GitHub.html#backporting-fixes-to-the-release-branches

src/borrow_check/region_inference.md

@@ -81,7 +81,7 @@ For each region we maintain a set storing what elements are present in its value
 efficient, we give each kind of element an index, the `RegionElementIndex`, and
 use sparse bitsets).
 
-[ri]: https://github.com/rust-lang/rust/tree/master/compiler/rustc_borrowck/src/region_infer
+[ri]: https://github.com/rust-lang/rust/tree/HEAD/compiler/rustc_borrowck/src/region_infer
 
 The kinds of region elements are as follows:
 

src/building/bootstrapping/how-bootstrap-does-it.md

@@ -39,12 +39,12 @@ pub trait Step: 'static + Clone + Debug + PartialEq + Eq + Hash {
 
 There's a couple of preliminary steps before core Bootstrap code is reached:
 
-1. Shell script or `make`: [`./x`](https://github.com/rust-lang/rust/blob/master/x) or [`./x.ps1`](https://github.com/rust-lang/rust/blob/master/x.ps1) or `make`
-2. Convenience wrapper script: [`x.py`](https://github.com/rust-lang/rust/blob/master/x.py)
-3. [`src/bootstrap/bootstrap.py`](https://github.com/rust-lang/rust/blob/master/src/bootstrap/bootstrap.py)
-4. [`src/bootstrap/src/bin/main.rs`](https://github.com/rust-lang/rust/blob/master/src/bootstrap/src/bin/main.rs)
+1. Shell script or `make`: [`./x`](https://github.com/rust-lang/rust/blob/HEAD/x) or [`./x.ps1`](https://github.com/rust-lang/rust/blob/HEAD/x.ps1) or `make`
+2. Convenience wrapper script: [`x.py`](https://github.com/rust-lang/rust/blob/HEAD/x.py)
+3. [`src/bootstrap/bootstrap.py`](https://github.com/rust-lang/rust/blob/HEAD/src/bootstrap/bootstrap.py)
+4. [`src/bootstrap/src/bin/main.rs`](https://github.com/rust-lang/rust/blob/HEAD/src/bootstrap/src/bin/main.rs)
 
-See [src/bootstrap/README.md](https://github.com/rust-lang/rust/blob/master/src/bootstrap/README.md)
+See [src/bootstrap/README.md](https://github.com/rust-lang/rust/blob/HEAD/src/bootstrap/README.md)
 for a more specific description of the implementation details.
 
 [`Step`]: https://doc.rust-lang.org/nightly/nightly-rustc/bootstrap/core/builder/trait.Step.html

src/building/bootstrapping/what-bootstrapping-does.md

@@ -12,12 +12,12 @@ only way to build a modern version of `rustc` is with a slightly less modern ver
 This is exactly how [`./x.py`] works: it downloads the current beta release of
 `rustc`, then uses it to compile the new compiler.
 
-[`./x.py`]: https://github.com/rust-lang/rust/blob/master/x.py
+[`./x.py`]: https://github.com/rust-lang/rust/blob/HEAD/x.py
 
 Note that this documentation mostly covers user-facing information. See
 [bootstrap/README.md][bootstrap-internals] to read about bootstrap internals.
 
-[bootstrap-internals]: https://github.com/rust-lang/rust/blob/master/src/bootstrap/README.md
+[bootstrap-internals]: https://github.com/rust-lang/rust/blob/HEAD/src/bootstrap/README.md
 
 ## Stages of bootstrapping
 
@@ -74,8 +74,8 @@ build the stage2 compiler.
 There are two concepts at play here: a compiler (with its set of dependencies) and its
 'target' or 'object' libraries (`std` and `rustc`). Both are staged, but in a staggered manner.
 
-[`compiler/rustc`]: https://github.com/rust-lang/rust/tree/master/compiler/rustc
-[`src/bootstrap`]: https://github.com/rust-lang/rust/tree/master/src/bootstrap
+[`compiler/rustc`]: https://github.com/rust-lang/rust/tree/HEAD/compiler/rustc
+[`src/bootstrap`]: https://github.com/rust-lang/rust/tree/HEAD/src/bootstrap
 
 ### Stage 1: from current code, by an earlier compiler
 
@@ -129,7 +129,7 @@ You can always override the stage by passing `--stage N` explicitly.
 For more information about stages, [see
 below](#understanding-stages-of-bootstrap).
 
-[`./x`]: https://github.com/rust-lang/rust/blob/master/x
+[`./x`]: https://github.com/rust-lang/rust/blob/HEAD/x
 
 ## Complications of bootstrapping
 

src/building/prerequisites.md

@@ -2,7 +2,7 @@
 
 ## Dependencies
 
-See [the `rust-lang/rust` INSTALL](https://github.com/rust-lang/rust/blob/master/INSTALL.md#dependencies).
+See [the `rust-lang/rust` INSTALL](https://github.com/rust-lang/rust/blob/HEAD/INSTALL.md#dependencies).
 
 ## Hardware
 

src/building/suggested.md

@@ -451,15 +451,15 @@ pkgs.mkShell {
 
 If you use Bash, Zsh, Fish or PowerShell, you can find automatically-generated shell
 completion scripts for `x.py` in
-[`src/etc/completions`](https://github.com/rust-lang/rust/tree/master/src/etc/completions).
+[`src/etc/completions`](https://github.com/rust-lang/rust/tree/HEAD/src/etc/completions).
 
 You can use `source ./src/etc/completions/x.py.<extension>` to load completions
 for your shell of choice, or `& .\src\etc\completions\x.py.ps1` for PowerShell.
 Adding this to your shell's startup script (e.g. `.bashrc`) will automatically
 load this completion.
 
-[`src/etc/rust_analyzer_settings.json`]: https://github.com/rust-lang/rust/blob/master/src/etc/rust_analyzer_settings.json
-[`src/etc/rust_analyzer_eglot.el`]: https://github.com/rust-lang/rust/blob/master/src/etc/rust_analyzer_eglot.el
-[`src/etc/rust_analyzer_helix.toml`]: https://github.com/rust-lang/rust/blob/master/src/etc/rust_analyzer_helix.toml
-[`src/etc/rust_analyzer_zed.json`]: https://github.com/rust-lang/rust/blob/master/src/etc/rust_analyzer_zed.json
-[`src/etc/pre-push.sh`]: https://github.com/rust-lang/rust/blob/master/src/etc/pre-push.sh
+[`src/etc/rust_analyzer_settings.json`]: https://github.com/rust-lang/rust/blob/HEAD/src/etc/rust_analyzer_settings.json
+[`src/etc/rust_analyzer_eglot.el`]: https://github.com/rust-lang/rust/blob/HEAD/src/etc/rust_analyzer_eglot.el
+[`src/etc/rust_analyzer_helix.toml`]: https://github.com/rust-lang/rust/blob/HEAD/src/etc/rust_analyzer_helix.toml
+[`src/etc/rust_analyzer_zed.json`]: https://github.com/rust-lang/rust/blob/HEAD/src/etc/rust_analyzer_zed.json
+[`src/etc/pre-push.sh`]: https://github.com/rust-lang/rust/blob/HEAD/src/etc/pre-push.sh

src/compiler-debugging.md

@@ -158,7 +158,7 @@ error: internal compiler error: unexpected panic
 
 note: the compiler unexpectedly panicked. this is a bug.
 
-note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
+note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/HEAD/CONTRIBUTING.md#bug-reports
 
 note: rustc 1.24.0-dev running on x86_64-unknown-linux-gnu
 
@@ -284,7 +284,7 @@ Here are some notable ones:
 
 Right below you can find elaborate explainers on a selected few.
 
-[`builtin_attrs`]: https://github.com/rust-lang/rust/blob/master/compiler/rustc_feature/src/builtin_attrs.rs
+[`builtin_attrs`]: https://github.com/rust-lang/rust/blob/HEAD/compiler/rustc_feature/src/builtin_attrs.rs
 [`def_path_str`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html#method.def_path_str
 [`inferred_outlives_of`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html#method.inferred_outlives_of
 [`item_bounds`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/context/struct.TyCtxt.html#method.item_bounds