rust-lang · bors · Oct 21, 2023 · Oct 19, 2023 · Oct 19, 2023 · Oct 19, 2023
diff --git a/Cargo.lock b/Cargo.lock
@@ -3697,7 +3697,6 @@ version = "0.0.0"
 dependencies = [
  "arrayvec",
  "bitflags 1.3.2",
- "cfg-if",
  "elsa",
  "ena",
  "indexmap 2.0.0",
@@ -4529,7 +4528,6 @@ dependencies = [
 name = "rustc_span"
 version = "0.0.0"
 dependencies = [
- "cfg-if",
  "indexmap 2.0.0",
  "md-5",
  "rustc_arena",

diff --git a/README.md b/README.md
@@ -11,6 +11,20 @@ standard library, and documentation.
 If you wish to _contribute_ to the compiler, you should read
 [CONTRIBUTING.md](CONTRIBUTING.md) instead.
 
+<details>
+<summary>Table of content</summary>
+
+- [Quick Start](#quick-start)
+- [Installing from Source](#installing-from-source)
+- [Building Documentation](#building-documentation)
+- [Notes](#notes)
+- [Getting Help](#getting-help)
+- [Contributing](#contributing)
+- [License](#license)
+- [Trademark](#trademark)
+
+</details>
+
 ## Quick Start
 
 Read ["Installation"] from [The Book].

diff --git a/compiler/rustc_data_structures/Cargo.toml b/compiler/rustc_data_structures/Cargo.toml
@@ -8,7 +8,6 @@ edition = "2021"
 [dependencies]
 arrayvec = { version = "0.7", default-features = false }
 bitflags = "1.2.1"
-cfg-if = "1.0"
 ena = "0.14.2"
 indexmap = { version = "2.0.0" }
 jobserver_crate = { version = "0.1.13", package = "jobserver" }

diff --git a/compiler/rustc_data_structures/src/flock.rs b/compiler/rustc_data_structures/src/flock.rs
@@ -4,17 +4,20 @@
 //! green/native threading. This is just a bare-bones enough solution for
 //! librustdoc, it is not production quality at all.
 
-cfg_if! {
-    if #[cfg(target_os = "linux")] {
+cfg_match! {
+    cfg(target_os = "linux") => {
         mod linux;
         use linux as imp;
-    } else if #[cfg(unix)] {
+    }
+    cfg(unix) => {
         mod unix;
         use unix as imp;
-    } else if #[cfg(windows)] {
+    }
+    cfg(windows) => {
         mod windows;
         use self::windows as imp;
-    } else {
+    }
+    _ => {
         mod unsupported;
         use unsupported as imp;
     }

diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
@@ -6,43 +6,44 @@
 //!
 //! This API is completely unstable and subject to change.
 
+// tidy-alphabetical-start
+#![allow(internal_features)]
+#![allow(rustc::default_hash_types)]
+#![allow(rustc::potential_query_instability)]
 #![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
+#![deny(rustc::diagnostic_outside_of_impl)]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(unsafe_op_in_unsafe_fn)]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+#![feature(allocator_api)]
 #![feature(array_windows)]
 #![feature(auto_traits)]
 #![feature(cell_leak)]
+#![feature(cfg_match)]
 #![feature(core_intrinsics)]
 #![feature(extend_one)]
 #![feature(hash_raw_entry)]
 #![feature(hasher_prefixfree_extras)]
+#![feature(lazy_cell)]
+#![feature(lint_reasons)]
+#![feature(macro_metavar_expr)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(min_specialization)]
+#![feature(negative_impls)]
 #![feature(never_type)]
-#![feature(type_alias_impl_trait)]
-#![feature(lazy_cell)]
+#![feature(ptr_alignment_type)]
 #![feature(rustc_attrs)]
-#![feature(negative_impls)]
+#![feature(strict_provenance)]
 #![feature(test)]
 #![feature(thread_id_value)]
-#![feature(allocator_api)]
-#![feature(lint_reasons)]
+#![feature(type_alias_impl_trait)]
 #![feature(unwrap_infallible)]
-#![feature(strict_provenance)]
-#![feature(ptr_alignment_type)]
-#![feature(macro_metavar_expr)]
-#![allow(rustc::default_hash_types)]
-#![allow(rustc::potential_query_instability)]
-#![deny(rustc::untranslatable_diagnostic)]
-#![deny(rustc::diagnostic_outside_of_impl)]
-#![allow(internal_features)]
-#![deny(unsafe_op_in_unsafe_fn)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate tracing;
 #[macro_use]
-extern crate cfg_if;
-#[macro_use]
 extern crate rustc_macros;
 
 use std::fmt;

diff --git a/compiler/rustc_data_structures/src/marker.rs b/compiler/rustc_data_structures/src/marker.rs
@@ -1,11 +1,12 @@
-cfg_if!(
-    if #[cfg(not(parallel_compiler))] {
+cfg_match! {
+    cfg(not(parallel_compiler)) => {
         pub auto trait DynSend {}
         pub auto trait DynSync {}
 
         impl<T> DynSend for T {}
         impl<T> DynSync for T {}
-    } else {
+    }
+    _ => {
         #[rustc_on_unimplemented(
             message = "`{Self}` doesn't implement `DynSend`. \
             Add it to `rustc_data_structures::marker` or use `IntoDynSyncSend` if it's already `Send`"
@@ -48,13 +49,10 @@ cfg_if!(
             [std::io::StdoutLock<'_>]
             [std::io::StderrLock<'_>]
         );
-        cfg_if!(
-            // Consistent with `std`
-            // `os_imp::Env` is `!Send` in these platforms
-            if #[cfg(any(unix, target_os = "hermit", target_os = "wasi", target_os = "solid_asp3"))] {
-                impl !DynSend for std::env::VarsOs {}
-            }
-        );
+
+        #[cfg(any(unix, target_os = "hermit", target_os = "wasi", target_os = "solid_asp3"))]
+        // Consistent with `std`, `os_imp::Env` is `!Sync` in these platforms
+        impl !DynSend for std::env::VarsOs {}
 
         macro_rules! already_send {
             ($([$ty: ty])*) => {
@@ -123,13 +121,10 @@ cfg_if!(
             [std::sync::mpsc::Receiver<T> where T]
             [std::sync::mpsc::Sender<T> where T]
         );
-        cfg_if!(
-            // Consistent with `std`
-            // `os_imp::Env` is `!Sync` in these platforms
-            if #[cfg(any(unix, target_os = "hermit", target_os = "wasi", target_os = "solid_asp3"))] {
-                impl !DynSync for std::env::VarsOs {}
-            }
-        );
+
+        #[cfg(any(unix, target_os = "hermit", target_os = "wasi", target_os = "solid_asp3"))]
+        // Consistent with `std`, `os_imp::Env` is `!Sync` in these platforms
+        impl !DynSync for std::env::VarsOs {}
 
         macro_rules! already_sync {
             ($([$ty: ty])*) => {
@@ -183,7 +178,7 @@ cfg_if!(
             [thin_vec::ThinVec<T> where T: DynSync]
         );
     }
-);
+}
 
 pub fn assert_dyn_sync<T: ?Sized + DynSync>() {}
 pub fn assert_dyn_send<T: ?Sized + DynSend>() {}

diff --git a/compiler/rustc_data_structures/src/profiling.rs b/compiler/rustc_data_structures/src/profiling.rs
@@ -859,8 +859,8 @@ fn get_thread_id() -> u32 {
 }
 
 // Memory reporting
-cfg_if! {
-    if #[cfg(windows)] {
+cfg_match! {
+    cfg(windows) => {
         pub fn get_resident_set_size() -> Option<usize> {
             use std::mem;
 
@@ -885,7 +885,8 @@ cfg_if! {
 
             Some(pmc.WorkingSetSize)
         }
-    } else if #[cfg(target_os = "macos")] {
+    }
+    cfg(target_os = "macos")  => {
         pub fn get_resident_set_size() -> Option<usize> {
             use libc::{c_int, c_void, getpid, proc_pidinfo, proc_taskinfo, PROC_PIDTASKINFO};
             use std::mem;
@@ -903,7 +904,8 @@ cfg_if! {
                 }
             }
         }
-    } else if #[cfg(unix)] {
+    }
+    cfg(unix) => {
         pub fn get_resident_set_size() -> Option<usize> {
             let field = 1;
             let contents = fs::read("/proc/self/statm").ok()?;
@@ -912,7 +914,8 @@ cfg_if! {
             let npages = s.parse::<usize>().ok()?;
             Some(npages * 4096)
         }
-    } else {
+    }
+    _ => {
         pub fn get_resident_set_size() -> Option<usize> {
             None
         }

diff --git a/compiler/rustc_data_structures/src/sync.rs b/compiler/rustc_data_structures/src/sync.rs
@@ -109,8 +109,8 @@ mod mode {
 
 pub use mode::{is_dyn_thread_safe, set_dyn_thread_safe_mode};
 
-cfg_if! {
-    if #[cfg(not(parallel_compiler))] {
+cfg_match! {
+    cfg(not(parallel_compiler)) => {
         use std::ops::Add;
         use std::cell::Cell;
 
@@ -251,7 +251,8 @@ cfg_if! {
                 MTLock(self.0.clone())
             }
         }
-    } else {
+    }
+    _ => {
         pub use std::marker::Send as Send;
         pub use std::marker::Sync as Sync;
 

diff --git a/compiler/rustc_expand/messages.ftl b/compiler/rustc_expand/messages.ftl
@@ -86,6 +86,7 @@ expand_module_circular =
 expand_module_file_not_found =
     file not found for module `{$name}`
     .help = to create the module `{$name}`, create file "{$default_path}" or "{$secondary_path}"
+    .note = if there is a `mod {$name}` elsewhere in the crate already, import it with `use crate::...` instead
 
 expand_module_in_block =
     cannot declare a non-inline module inside a block unless it has a path attribute

diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs
@@ -350,6 +350,7 @@ pub(crate) struct ModuleInBlockName {
 #[derive(Diagnostic)]
 #[diag(expand_module_file_not_found, code = "E0583")]
 #[help]
+#[note]
 pub(crate) struct ModuleFileNotFound {
     #[primary_span]
     pub span: Span,

diff --git a/compiler/rustc_span/Cargo.toml b/compiler/rustc_span/Cargo.toml
@@ -13,7 +13,6 @@ rustc_index = { path = "../rustc_index" }
 rustc_arena = { path = "../rustc_arena" }
 scoped-tls = "1.0"
 unicode-width = "0.1.4"
-cfg-if = "1.0"
 tracing = "0.1"
 sha1 = "0.10.0"
 sha2 = "0.10.1"

diff --git a/compiler/rustc_span/src/analyze_source_file.rs b/compiler/rustc_span/src/analyze_source_file.rs
@@ -33,8 +33,8 @@ pub fn analyze_source_file(
     (lines, multi_byte_chars, non_narrow_chars)
 }
 
-cfg_if::cfg_if! {
-    if #[cfg(any(target_arch = "x86", target_arch = "x86_64"))] {
+cfg_match! {
+    cfg(any(target_arch = "x86", target_arch = "x86_64")) => {
         fn analyze_source_file_dispatch(src: &str,
                                     lines: &mut Vec<RelativeBytePos>,
                                     multi_byte_chars: &mut Vec<MultiByteChar>,
@@ -172,8 +172,8 @@ cfg_if::cfg_if! {
                                         non_narrow_chars);
             }
         }
-    } else {
-
+    }
+    _ => {
         // The target (or compiler version) does not support SSE2 ...
         fn analyze_source_file_dispatch(src: &str,
                                     lines: &mut Vec<RelativeBytePos>,

diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
@@ -13,21 +13,24 @@
 //!
 //! This API is completely unstable and subject to change.
 
-#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
+// tidy-alphabetical-start
+#![allow(internal_features)]
 #![cfg_attr(not(bootstrap), doc(rust_logo))]
 #![cfg_attr(not(bootstrap), feature(rustdoc_internals))]
+#![deny(rustc::diagnostic_outside_of_impl)]
+#![deny(rustc::untranslatable_diagnostic)]
+#![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(array_windows)]
+#![feature(cfg_match)]
 #![feature(if_let_guard)]
-#![feature(negative_impls)]
-#![feature(min_specialization)]
-#![feature(rustc_attrs)]
 #![feature(let_chains)]
-#![feature(round_char_boundary)]
-#![feature(read_buf)]
+#![feature(min_specialization)]
+#![feature(negative_impls)]
 #![feature(new_uninit)]
-#![deny(rustc::untranslatable_diagnostic)]
-#![deny(rustc::diagnostic_outside_of_impl)]
-#![allow(internal_features)]
+#![feature(read_buf)]
+#![feature(round_char_boundary)]
+#![feature(rustc_attrs)]
+// tidy-alphabetical-end
 
 #[macro_use]
 extern crate rustc_macros;

diff --git a/compiler/rustc_target/src/asm/csky.rs b/compiler/rustc_target/src/asm/csky.rs
@@ -64,9 +64,9 @@ def_regs! {
         r20: reg = ["r20","t4"],// feature high-register
         r21: reg = ["r21","t5"],// feature high-register
         r22: reg = ["r22","t6"],// feature high-register
-        r23: reg = ["r23","t7", "fp"],// feature high-register
-        r24: reg = ["r24","t8", "sop"],// feature high-register
-        r25: reg = ["r25","t9","tp", "bsp"],// feature high-register
+        r23: reg = ["r23","t7"],// feature high-register
+        r24: reg = ["r24","t8"],// feature high-register
+        r25: reg = ["r25","t9"],// feature high-register
         f0: freg = ["fr0","vr0"],
         f1: freg = ["fr1","vr1"],
         f2: freg = ["fr2","vr2"],

diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
@@ -207,7 +207,7 @@ impl<T> Box<T> {
     /// ```
     /// let five = Box::new(5);
     /// ```
-    #[cfg(all(not(no_global_oom_handling)))]
+    #[cfg(not(no_global_oom_handling))]
     #[inline(always)]
     #[stable(feature = "rust1", since = "1.0.0")]
     #[must_use]

diff --git a/src/doc/rustdoc/src/write-documentation/what-to-include.md b/src/doc/rustdoc/src/write-documentation/what-to-include.md
@@ -117,7 +117,7 @@ rustdoc --theme awesome.css src/lib.rs
 
 Here is an example of a new theme, [Ayu].
 
-[Ayu]: https://github.com/rust-lang/rust/blob/master/src/librustdoc/html/static/css/themes/ayu.css
+[Ayu]: https://github.com/rust-lang/rust/blob/master/src/librustdoc/html/static/css/rustdoc.css#L2384-L2574
 [API Guidelines]: https://rust-lang.github.io/api-guidelines/documentation.html#rustdoc-does-not-show-unhelpful-implementation-details-c-hidden
 [Documentation tests]: documentation-tests.md
 [on this blog]: https://blog.guillaume-gomez.fr/articles/2016-09-16+Generating+doc+with+rustdoc+and+a+custom+theme

diff --git a/tests/run-make/unknown-mod-stdin/unknown-mod.stderr b/tests/run-make/unknown-mod-stdin/unknown-mod.stderr
@@ -5,6 +5,7 @@ error[E0583]: file not found for module `unknown`
   | ^^^^^^^^^^^^
   |
   = help: to create the module `unknown`, create file "unknown.rs" or "unknown/mod.rs"
+  = note: if there is a `mod unknown` elsewhere in the crate already, import it with `use crate::...` instead
 
 error: aborting due to previous error
 

diff --git a/tests/ui/error-codes/E0583.stderr b/tests/ui/error-codes/E0583.stderr
@@ -5,6 +5,7 @@ LL | mod module_that_doesnt_exist;
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: to create the module `module_that_doesnt_exist`, create file "$DIR/module_that_doesnt_exist.rs" or "$DIR/module_that_doesnt_exist/mod.rs"
+   = note: if there is a `mod module_that_doesnt_exist` elsewhere in the crate already, import it with `use crate::...` instead
 
 error: aborting due to previous error
 

diff --git a/tests/ui/invalid-module-declaration/invalid-module-declaration.stderr b/tests/ui/invalid-module-declaration/invalid-module-declaration.stderr
@@ -5,6 +5,7 @@ LL | pub mod baz;
    | ^^^^^^^^^^^^
    |
    = help: to create the module `baz`, create file "$DIR/auxiliary/foo/bar/baz.rs" or "$DIR/auxiliary/foo/bar/baz/mod.rs"
+   = note: if there is a `mod baz` elsewhere in the crate already, import it with `use crate::...` instead
 
 error: aborting due to previous error
 

diff --git a/tests/ui/missing_non_modrs_mod/missing_non_modrs_mod.stderr b/tests/ui/missing_non_modrs_mod/missing_non_modrs_mod.stderr
@@ -5,6 +5,7 @@ LL | mod missing;
    | ^^^^^^^^^^^^
    |
    = help: to create the module `missing`, create file "$DIR/foo/missing.rs" or "$DIR/foo/missing/mod.rs"
+   = note: if there is a `mod missing` elsewhere in the crate already, import it with `use crate::...` instead
 
 error: aborting due to previous error