Remove rustc workspace hacks

crates/project-model/src/workspace.rs

@@ -42,6 +42,15 @@ 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.
@@ -983,25 +992,13 @@ 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
         };
 
@@ -1115,13 +1112,7 @@ fn cargo_to_crate_graph(
                 &pkg_crates,
                 &cfg_options,
                 override_cfg,
-                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
-                    build_scripts
-                } else {
-                    rustc_build_scripts
-                },
+                rustc_build_scripts,
             );
         }
     }
@@ -1212,20 +1203,7 @@ 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

@@ -152,8 +152,6 @@ config_data! {
         // FIXME(@poliorcetics): move to multiple targets here too, but this will need more work
         // than `checkOnSave_target`
         cargo_target: Option<String>     = "null",
-        /// Unsets the implicit `#[cfg(test)]` for the specified crates.
-        cargo_unsetTest: Vec<String>     = "[\"core\"]",
 
         /// Run the check command for diagnostics on save.
         checkOnSave | checkOnSave_enable: bool                         = "true",
@@ -1292,18 +1290,11 @@ impl Config {
                         .collect(),
                     vec![],
                 )
-                .unwrap(),
-                selective: self
-                    .data
-                    .cargo_unsetTest
-                    .iter()
-                    .map(|it| {
-                        (
-                            it.clone(),
-                            CfgDiff::new(vec![], vec![CfgAtom::Flag("test".into())]).unwrap(),
-                        )
-                    })
-                    .collect(),
+                .unwrap_or_else(|| {
+                    tracing::error!("`cargo.cfgs` config contains duplicate keys");
+                    Default::default()
+                }),
+                selective: Default::default(),
             },
             wrap_rustc_in_build_scripts: self.data.cargo_buildScripts_useRustcWrapper,
             invocation_strategy: match self.data.cargo_buildScripts_invocationStrategy {

docs/user/generated_config.adoc

@@ -144,11 +144,6 @@ This option does not take effect until rust-analyzer is restarted.
 --
 Compilation target override (target triple).
 --
-[[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

@@ -671,16 +671,6 @@
                         "string"
                     ]
                 },
-                "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,