Auto merge of #137284 - matthiaskrgr:rollup-deuhk46, r=matthiaskrgr

Rollup of 9 pull requests

Successful merges:

 - #127793 (Added project-specific Zed IDE settings)
 - #134995 (Stabilize const_slice_flatten)
 - #136301 (Improve instant docs)
 - #136347 (Add a bullet point to `std::fs::copy`)
 - #136794 (Stabilize file_lock)
 - #137094 (x86_win64 ABI: do not use xmm0 with softfloat ABI)
 - #137227 (docs(dev): Update the feature-gate instructions)
 - #137232 (Don't mention `FromResidual` on bad `?`)
 - #137251 (coverage: Get hole spans from nested items without fully visiting them)

r? `@ghost`
`@rustbot` modify labels: rollup

5 files changed, 129 insertions, 42 deletions

diff --git a/src/bootstrap/src/core/build_steps/setup.rs b/src/bootstrap/src/core/build_steps/setup.rs
index fbd0dc3ec30..f25dfaab0f1 100644
--- a/src/bootstrap/src/core/build_steps/setup.rs
+++ b/src/bootstrap/src/core/build_steps/setup.rs
@@ -523,19 +523,31 @@ undesirable, simply delete the `pre-push` file from .git/hooks."
 /// Handles editor-specific setup differences
 #[derive(Clone, Debug, Eq, PartialEq)]
 enum EditorKind {
-    Vscode,
-    Vim,
     Emacs,
     Helix,
+    Vim,
+    VsCode,
+    Zed,
 }
 
 impl EditorKind {
+    // Used in `./tests.rs`.
+    #[allow(dead_code)]
+    pub const ALL: &[EditorKind] = &[
+        EditorKind::Emacs,
+        EditorKind::Helix,
+        EditorKind::Vim,
+        EditorKind::VsCode,
+        EditorKind::Zed,
+    ];
+
     fn prompt_user() -> io::Result<Option<EditorKind>> {
         let prompt_str = "Available editors:
-1. vscode
-2. vim
-3. emacs
-4. helix
+1. Emacs
+2. Helix
+3. Vim
+4. VS Code
+5. Zed
 
 Select which editor you would like to set up [default: None]: ";
 
@@ -543,28 +555,41 @@ Select which editor you would like to set up [default: None]: ";
         loop {
             print!("{}", prompt_str);
             io::stdout().flush()?;
-            input.clear();
             io::stdin().read_line(&mut input)?;
-            match input.trim().to_lowercase().as_str() {
-                "1" | "vscode" => return Ok(Some(EditorKind::Vscode)),
-                "2" | "vim" => return Ok(Some(EditorKind::Vim)),
-                "3" | "emacs" => return Ok(Some(EditorKind::Emacs)),
-                "4" | "helix" => return Ok(Some(EditorKind::Helix)),
-                "" => return Ok(None),
+
+            let mut modified_input = input.to_lowercase();
+            modified_input.retain(|ch| !ch.is_whitespace());
+            match modified_input.as_str() {
+                "1" | "emacs" => return Ok(Some(EditorKind::Emacs)),
+                "2" | "helix" => return Ok(Some(EditorKind::Helix)),
+                "3" | "vim" => return Ok(Some(EditorKind::Vim)),
+                "4" | "vscode" => return Ok(Some(EditorKind::VsCode)),
+                "5" | "zed" => return Ok(Some(EditorKind::Zed)),
+                "" | "none" => return Ok(None),
                 _ => {
                     eprintln!("ERROR: unrecognized option '{}'", input.trim());
                     eprintln!("NOTE: press Ctrl+C to exit");
                 }
-            };
+            }
+
+            input.clear();
         }
     }
 
     /// A list of historical hashes of each LSP settings file
     /// New entries should be appended whenever this is updated so we can detect
     /// outdated vs. user-modified settings files.
-    fn hashes(&self) -> Vec<&str> {
+    fn hashes(&self) -> &'static [&'static str] {
         match self {
-            EditorKind::Vscode | EditorKind::Vim => vec![
+            EditorKind::Emacs => &[
+                "51068d4747a13732440d1a8b8f432603badb1864fa431d83d0fd4f8fa57039e0",
+                "d29af4d949bbe2371eac928a3c31cf9496b1701aa1c45f11cd6c759865ad5c45",
+            ],
+            EditorKind::Helix => &[
+                "2d3069b8cf1b977e5d4023965eb6199597755e6c96c185ed5f2854f98b83d233",
+                "6736d61409fbebba0933afd2e4c44ff2f97c1cb36cf0299a7f4a7819b8775040",
+            ],
+            EditorKind::Vim | EditorKind::VsCode => &[
                 "ea67e259dedf60d4429b6c349a564ffcd1563cf41c920a856d1f5b16b4701ac8",
                 "56e7bf011c71c5d81e0bf42e84938111847a810eee69d906bba494ea90b51922",
                 "af1b5efe196aed007577899db9dae15d6dbc923d6fa42fa0934e68617ba9bbe0",
@@ -576,12 +601,8 @@ Select which editor you would like to set up [default: None]: ";
                 "4eecb58a2168b252077369da446c30ed0e658301efe69691979d1ef0443928f4",
                 "c394386e6133bbf29ffd32c8af0bb3d4aac354cba9ee051f29612aa9350f8f8d",
             ],
-            EditorKind::Emacs => vec![
-                "51068d4747a13732440d1a8b8f432603badb1864fa431d83d0fd4f8fa57039e0",
-                "d29af4d949bbe2371eac928a3c31cf9496b1701aa1c45f11cd6c759865ad5c45",
-            ],
-            EditorKind::Helix => {
-                vec!["2d3069b8cf1b977e5d4023965eb6199597755e6c96c185ed5f2854f98b83d233"]
+            EditorKind::Zed => {
+                &["bbce727c269d1bd0c98afef4d612eb4ce27aea3c3a8968c5f10b31affbc40b6c"]
             }
         }
     }
@@ -592,29 +613,31 @@ Select which editor you would like to set up [default: None]: ";
 
     fn settings_short_path(&self) -> PathBuf {
         self.settings_folder().join(match self {
-            EditorKind::Vscode => "settings.json",
-            EditorKind::Vim => "coc-settings.json",
             EditorKind::Emacs => ".dir-locals.el",
             EditorKind::Helix => "languages.toml",
+            EditorKind::Vim => "coc-settings.json",
+            EditorKind::VsCode | EditorKind::Zed => "settings.json",
         })
     }
 
     fn settings_folder(&self) -> PathBuf {
         match self {
-            EditorKind::Vscode => PathBuf::from(".vscode"),
-            EditorKind::Vim => PathBuf::from(".vim"),
             EditorKind::Emacs => PathBuf::new(),
             EditorKind::Helix => PathBuf::from(".helix"),
+            EditorKind::Vim => PathBuf::from(".vim"),
+            EditorKind::VsCode => PathBuf::from(".vscode"),
+            EditorKind::Zed => PathBuf::from(".zed"),
         }
     }
 
-    fn settings_template(&self) -> &str {
+    fn settings_template(&self) -> &'static str {
         match self {
-            EditorKind::Vscode | EditorKind::Vim => {
-                include_str!("../../../../etc/rust_analyzer_settings.json")
-            }
             EditorKind::Emacs => include_str!("../../../../etc/rust_analyzer_eglot.el"),
             EditorKind::Helix => include_str!("../../../../etc/rust_analyzer_helix.toml"),
+            EditorKind::Vim | EditorKind::VsCode => {
+                include_str!("../../../../etc/rust_analyzer_settings.json")
+            }
+            EditorKind::Zed => include_str!("../../../../etc/rust_analyzer_zed.json"),
         }
     }
 
diff --git a/src/bootstrap/src/core/build_steps/setup/tests.rs b/src/bootstrap/src/core/build_steps/setup/tests.rs
index f3d4b6aa4db..e8f83ff75e4 100644
--- a/src/bootstrap/src/core/build_steps/setup/tests.rs
+++ b/src/bootstrap/src/core/build_steps/setup/tests.rs
@@ -5,13 +5,16 @@ use crate::utils::helpers::hex_encode;
 
 #[test]
 fn check_matching_settings_hash() {
-    let editor = EditorKind::Vscode;
-    let mut hasher = sha2::Sha256::new();
-    hasher.update(&editor.settings_template());
-    let hash = hex_encode(hasher.finalize().as_slice());
-    assert_eq!(
-        &hash,
-        editor.hashes().last().unwrap(),
-        "Update `EditorKind::hashes()` with the new hash of `src/etc/rust_analyzer_settings.json`"
-    );
+    for editor in EditorKind::ALL {
+        let mut hasher = sha2::Sha256::new();
+        hasher.update(&editor.settings_template());
+        let hash = hex_encode(hasher.finalize().as_slice());
+        assert_eq!(
+            &hash,
+            editor.hashes().last().unwrap(),
+            "Update `EditorKind::hashes()` with the new hash of `{}` for `EditorKind::{:?}`",
+            editor.settings_template(),
+            editor,
+        );
+    }
 }
diff --git a/src/doc/rustc-dev-guide/src/building/suggested.md b/src/doc/rustc-dev-guide/src/building/suggested.md
index 2c6c3fe1df8..5c041d6cb70 100644
--- a/src/doc/rustc-dev-guide/src/building/suggested.md
+++ b/src/doc/rustc-dev-guide/src/building/suggested.md
@@ -154,6 +154,16 @@ You can run `./x setup editor` and select `helix`, which will prompt you to
 create `languages.toml` with the recommended configuration for Helix. The
 recommended settings live at [`src/etc/rust_analyzer_helix.toml`].
 
+### Zed
+
+Zed comes with built-in LSP and rust-analyzer support.
+It can be configured through `.zed/settings.json`, as described
+[here](https://zed.dev/docs/configuring-languages). Selecting `zed`
+in `./x setup editor` will prompt you to create a `.zed/settings.json`
+file which will configure Zed with the recommended configuration. The
+recommended `rust-analyzer` settings live
+at [`src/etc/rust_analyzer_zed.json`].
+
 ## Check, check, and check again
 
 When doing simple refactoring, it can be useful to run `./x check`
@@ -381,4 +391,5 @@ 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
diff --git a/src/doc/rustc-dev-guide/src/implementing_new_features.md b/src/doc/rustc-dev-guide/src/implementing_new_features.md
index 5b67ccd7f4c..fda38ef4fc0 100644
--- a/src/doc/rustc-dev-guide/src/implementing_new_features.md
+++ b/src/doc/rustc-dev-guide/src/implementing_new_features.md
@@ -167,9 +167,7 @@ a new unstable feature:
 
 1. Prevent usage of the new feature unless the feature gate is set.
    You can check it in most places in the compiler using the
-   expression `tcx.features().$feature_name` (or
-   `sess.features_untracked().$feature_name` if the
-   tcx is unavailable)
+   expression `tcx.features().$feature_name()`
 
     If the feature gate is not set, you should either maintain
     the pre-feature behavior or raise an error, depending on
diff --git a/src/etc/rust_analyzer_zed.json b/src/etc/rust_analyzer_zed.json
new file mode 100644
index 00000000000..469ea050621
--- /dev/null
+++ b/src/etc/rust_analyzer_zed.json
@@ -0,0 +1,52 @@
+{
+  "lsp": {
+    "rust-analyzer": {
+      "initialization_options": {
+        "cargo": {
+          "buildScripts": {
+            "enable": true,
+            "invocationLocation": "root",
+            "invocationStrategy": "once",
+            "overrideCommand": ["python3", "x.py", "check", "--json-output"]
+          },
+          "extraEnv": {
+            "RUSTC_BOOTSTRAP": "1"
+          },
+          "sysrootSrc": "./library"
+        },
+        "check": {
+          "invocationLocation": "root",
+          "invocationStrategy": "once",
+          "overrideCommand": ["python3", "x.py", "check", "--json-output"]
+        },
+        "linkedProjects": [
+          "Cargo.toml",
+          "library/Cargo.toml",
+          "src/tools/x/Cargo.toml",
+          "src/bootstrap/Cargo.toml",
+          "src/tools/rust-analyzer/Cargo.toml",
+          "compiler/rustc_codegen_cranelift/Cargo.toml",
+          "compiler/rustc_codegen_gcc/Cargo.toml"
+        ],
+        "procMacro": {
+            "enable": true,
+            "server": "${workspaceFolder}/build/host/stage0/libexec/rust-analyzer-proc-macro-srv"
+        },
+        "rustc": {
+          "source": "./Cargo.toml"
+        },
+        "rustfmt": {
+          "overrideCommand": [
+            "${workspaceFolder}/build/host/rustfmt/bin/rustfmt",
+            "--edition=2021"
+          ]
+        },
+        "server": {
+          "extraEnv": {
+            "RUSTUP_TOOLCHAIN": "nightly"
+          }
+        }
+      }
+    }
+  }
+}