internal: Remove rustc core test cfg hacks

crates/project-model/src/workspace.rs

@@ -43,6 +43,15 @@ impl CfgOverrides {
     pub fn len(&self) -> usize {
         self.global.len() + self.selective.values().map(|it| it.len()).sum::<usize>()
     }
+
+    fn apply(&self, cfg_options: &mut CfgOptions, name: &str) {
+        if !self.global.is_empty() {
+            cfg_options.apply_diff(self.global.clone());
+        };
+        if let Some(diff) = self.selective.get(name) {
+            cfg_options.apply_diff(diff.clone());
+        };
+    }
 }
 
 /// `PackageRoot` describes a package root folder.
@@ -999,25 +1008,13 @@ fn cargo_to_crate_graph(
         let cfg_options = {
             let mut cfg_options = cfg_options.clone();
 
-            // Add test cfg for local crates
             if cargo[pkg].is_local {
+                // Add test cfg for local crates
                 cfg_options.insert_atom("test".into());
                 cfg_options.insert_atom("rust_analyzer".into());
             }
 
-            if !override_cfg.global.is_empty() {
-                cfg_options.apply_diff(override_cfg.global.clone());
-            };
-            if let Some(diff) = override_cfg.selective.get(&cargo[pkg].name) {
-                // FIXME: this is sort of a hack to deal with #![cfg(not(test))] vanishing such as seen
-                // in ed25519_dalek (#7243), and libcore (#9203) (although you only hit that one while
-                // working on rust-lang/rust as that's the only time it appears outside sysroot).
-                //
-                // A more ideal solution might be to reanalyze crates based on where the cursor is and
-                // figure out the set of cfgs that would have to apply to make it active.
-
-                cfg_options.apply_diff(diff.clone());
-            };
+            override_cfg.apply(&mut cfg_options, &cargo[pkg].name);
             cfg_options
         };
 
@@ -1153,6 +1150,7 @@ fn cargo_to_crate_graph(
                 &pkg_crates,
                 &cfg_options,
                 override_cfg,
+                // FIXME: Remove this once rustc switched over to rust-project.json
                 if rustc_workspace.workspace_root() == cargo.workspace_root() {
                     // the rustc workspace does not use the installed toolchain's proc-macro server
                     // so we need to make sure we don't use the pre compiled proc-macros there either
@@ -1250,20 +1248,7 @@ fn handle_rustc_crates(
             }
 
             let mut cfg_options = cfg_options.clone();
-
-            if !override_cfg.global.is_empty() {
-                cfg_options.apply_diff(override_cfg.global.clone());
-            };
-            if let Some(diff) = override_cfg.selective.get(&rustc_workspace[pkg].name) {
-                // FIXME: this is sort of a hack to deal with #![cfg(not(test))] vanishing such as seen
-                // in ed25519_dalek (#7243), and libcore (#9203) (although you only hit that one while
-                // working on rust-lang/rust as that's the only time it appears outside sysroot).
-                //
-                // A more ideal solution might be to reanalyze crates based on where the cursor is and
-                // figure out the set of cfgs that would have to apply to make it active.
-
-                cfg_options.apply_diff(diff.clone());
-            };
+            override_cfg.apply(&mut cfg_options, &rustc_workspace[pkg].name);
 
             for &tgt in rustc_workspace[pkg].targets.iter() {
                 let kind @ TargetKind::Lib { is_proc_macro } = rustc_workspace[tgt].kind else {

crates/rust-analyzer/src/config.rs

@@ -166,8 +166,6 @@ config_data! {
         /// Set to `true` to use a subdirectory of the existing target directory or
         /// set to a path relative to the workspace to use that path.
         cargo_targetDir | rust_analyzerTargetDir: Option<TargetDirectory> = None,
-        /// Unsets the implicit `#[cfg(test)]` for the specified crates.
-        cargo_unsetTest: Vec<String>     = vec!["core".to_owned()],
 
         /// Run the check command for diagnostics on save.
         checkOnSave | checkOnSave_enable: bool                         = true,
@@ -1604,16 +1602,7 @@ impl Config {
                     vec![],
                 )
                 .unwrap(),
-                selective: self
-                    .cargo_unsetTest()
-                    .iter()
-                    .map(|it| {
-                        (
-                            it.clone(),
-                            CfgDiff::new(vec![], vec![CfgAtom::Flag("test".into())]).unwrap(),
-                        )
-                    })
-                    .collect(),
+                selective: Default::default(),
             },
             wrap_rustc_in_build_scripts: *self.cargo_buildScripts_useRustcWrapper(),
             invocation_strategy: match self.cargo_buildScripts_invocationStrategy() {

docs/user/generated_config.adoc

@@ -158,18 +158,6 @@ building from locking the `Cargo.lock` at the expense of duplicating build artif
 
 Set to `true` to use a subdirectory of the existing target directory or
 set to a path relative to the workspace to use that path.
---
-[[rust-analyzer.cargo.unsetTest]]rust-analyzer.cargo.unsetTest::
-+
---
-Default:
-----
-[
-  "core"
-]
-----
-Unsets the implicit `#[cfg(test)]` for the specified crates.
-
 --
 [[rust-analyzer.checkOnSave]]rust-analyzer.checkOnSave (default: `true`)::
 +

editors/code/package.json

@@ -696,16 +696,6 @@
                         }
                     ]
                 },
-                "rust-analyzer.cargo.unsetTest": {
-                    "markdownDescription": "Unsets the implicit `#[cfg(test)]` for the specified crates.",
-                    "default": [
-                        "core"
-                    ],
-                    "type": "array",
-                    "items": {
-                        "type": "string"
-                    }
-                },
                 "rust-analyzer.checkOnSave": {
                     "markdownDescription": "Run the check command for diagnostics on save.",
                     "default": true,