6 files changed, 35 insertions, 41 deletions

diff --git a/crates/project_model/src/cargo_workspace.rs b/crates/project_model/src/cargo_workspace.rs
index 608a031d4..540b57ae4 100644
--- a/crates/project_model/src/cargo_workspace.rs
+++ b/crates/project_model/src/cargo_workspace.rs
@@ -65,6 +65,10 @@ pub struct CargoConfig {
     /// rustc target
     pub target: Option<String>,
 
+    /// Don't load sysroot crates (`std`, `core` & friends). Might be useful
+    /// when debugging isolated issues.
+    pub no_sysroot: bool,
+
     /// rustc private crate source
     pub rustc_source: Option<AbsPathBuf>,
 }
@@ -140,27 +144,27 @@ impl PackageData {
 impl CargoWorkspace {
     pub fn from_cargo_metadata(
         cargo_toml: &AbsPath,
-        cargo_features: &CargoConfig,
+        config: &CargoConfig,
     ) -> Result<CargoWorkspace> {
         let mut meta = MetadataCommand::new();
         meta.cargo_path(toolchain::cargo());
         meta.manifest_path(cargo_toml.to_path_buf());
-        if cargo_features.all_features {
+        if config.all_features {
             meta.features(CargoOpt::AllFeatures);
         } else {
-            if cargo_features.no_default_features {
+            if config.no_default_features {
                 // FIXME: `NoDefaultFeatures` is mutual exclusive with `SomeFeatures`
                 // https://github.com/oli-obk/cargo_metadata/issues/79
                 meta.features(CargoOpt::NoDefaultFeatures);
             }
-            if !cargo_features.features.is_empty() {
-                meta.features(CargoOpt::SomeFeatures(cargo_features.features.clone()));
+            if !config.features.is_empty() {
+                meta.features(CargoOpt::SomeFeatures(config.features.clone()));
             }
         }
         if let Some(parent) = cargo_toml.parent() {
             meta.current_dir(parent.to_path_buf());
         }
-        if let Some(target) = cargo_features.target.as_ref() {
+        if let Some(target) = config.target.as_ref() {
             meta.other_options(vec![String::from("--filter-platform"), target.clone()]);
         }
         let mut meta = meta.exec().with_context(|| {
@@ -170,8 +174,8 @@ impl CargoWorkspace {
         let mut out_dir_by_id = FxHashMap::default();
         let mut cfgs = FxHashMap::default();
         let mut proc_macro_dylib_paths = FxHashMap::default();
-        if cargo_features.load_out_dirs_from_check {
-            let resources = load_extern_resources(cargo_toml, cargo_features)?;
+        if config.load_out_dirs_from_check {
+            let resources = load_extern_resources(cargo_toml, config)?;
             out_dir_by_id = resources.out_dirs;
             cfgs = resources.cfgs;
             proc_macro_dylib_paths = resources.proc_dylib_paths;
diff --git a/crates/project_model/src/workspace.rs b/crates/project_model/src/workspace.rs
index 43ea351d1..8a1a60e0e 100644
--- a/crates/project_model/src/workspace.rs
+++ b/crates/project_model/src/workspace.rs
@@ -1,3 +1,7 @@
+//! Handles lowering of build-system specific workspace information (`cargo
+//! metadata` or `rust-project.json`) into representation stored in the salsa
+//! database -- `CrateGraph`.
+
 use std::{fmt, fs, path::Component, process::Command};
 
 use anyhow::{Context, Result};
@@ -56,11 +60,7 @@ impl fmt::Debug for ProjectWorkspace {
 }
 
 impl ProjectWorkspace {
-    pub fn load(
-        manifest: ProjectManifest,
-        cargo_config: &CargoConfig,
-        with_sysroot: bool,
-    ) -> Result<ProjectWorkspace> {
+    pub fn load(manifest: ProjectManifest, config: &CargoConfig) -> Result<ProjectWorkspace> {
         let res = match manifest {
             ProjectManifest::ProjectJson(project_json) => {
                 let file = fs::read_to_string(&project_json).with_context(|| {
@@ -84,32 +84,30 @@ impl ProjectWorkspace {
                     cmd
                 })?;
 
-                let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, cargo_config)
-                    .with_context(|| {
+                let cargo = CargoWorkspace::from_cargo_metadata(&cargo_toml, config).with_context(
+                    || {
                         format!(
                             "Failed to read Cargo metadata from Cargo.toml file {}, {}",
                             cargo_toml.display(),
                             cargo_version
                         )
-                    })?;
-                let sysroot = if with_sysroot {
+                    },
+                )?;
+                let sysroot = if config.no_sysroot {
+                    Sysroot::default()
+                } else {
                     Sysroot::discover(&cargo_toml).with_context(|| {
                         format!(
                             "Failed to find sysroot for Cargo.toml file {}. Is rust-src installed?",
                             cargo_toml.display()
                         )
                     })?
-                } else {
-                    Sysroot::default()
                 };
 
-                let rustc = if let Some(rustc_dir) = &cargo_config.rustc_source {
-                    Some(
-                        CargoWorkspace::from_cargo_metadata(&rustc_dir, cargo_config)
-                            .with_context(|| {
-                                format!("Failed to read Cargo metadata for Rust sources")
-                            })?,
-                    )
+                let rustc = if let Some(rustc_dir) = &config.rustc_source {
+                    Some(CargoWorkspace::from_cargo_metadata(&rustc_dir, config).with_context(
+                        || format!("Failed to read Cargo metadata for Rust sources"),
+                    )?)
                 } else {
                     None
                 };
diff --git a/crates/rust-analyzer/src/cli/load_cargo.rs b/crates/rust-analyzer/src/cli/load_cargo.rs
index ab1e2ab92..76526c66c 100644
--- a/crates/rust-analyzer/src/cli/load_cargo.rs
+++ b/crates/rust-analyzer/src/cli/load_cargo.rs
@@ -21,7 +21,6 @@ pub fn load_cargo(
     let ws = ProjectWorkspace::load(
         root,
         &CargoConfig { load_out_dirs_from_check, ..Default::default() },
-        true,
     )?;
 
     let (sender, receiver) = unbounded();
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index 372180ab5..d16796590 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -49,7 +49,6 @@ pub struct Config {
     pub hover: HoverConfig,
     pub semantic_tokens_refresh: bool,
 
-    pub with_sysroot: bool,
     pub linked_projects: Vec<LinkedProject>,
     pub root_path: AbsPathBuf,
 }
@@ -155,7 +154,6 @@ impl Config {
         Config {
             client_caps: ClientCapsConfig::default(),
 
-            with_sysroot: true,
             publish_diagnostics: true,
             diagnostics: DiagnosticsConfig::default(),
             diagnostics_map: DiagnosticsMapConfig::default(),
@@ -209,7 +207,6 @@ impl Config {
 
         let data = ConfigData::from_json(json);
 
-        self.with_sysroot = data.withSysroot;
         self.publish_diagnostics = data.diagnostics_enable;
         self.diagnostics = DiagnosticsConfig {
             disable_experimental: !data.diagnostics_enableExperimental,
@@ -246,6 +243,7 @@ impl Config {
             load_out_dirs_from_check: data.cargo_loadOutDirsFromCheck,
             target: data.cargo_target.clone(),
             rustc_source: rustc_source,
+            no_sysroot: data.cargo_noSysroot,
         };
         self.runnables = RunnablesConfig {
             override_cargo: data.runnables_overrideCargo,
@@ -492,6 +490,7 @@ config_data! {
         cargo_loadOutDirsFromCheck: bool = false,
         cargo_noDefaultFeatures: bool    = false,
         cargo_target: Option<String>     = None,
+        cargo_noSysroot: bool            = false,
 
         checkOnSave_enable: bool                         = true,
         checkOnSave_allFeatures: Option<bool>            = None,
@@ -544,7 +543,6 @@ config_data! {
         rustfmt_extraArgs: Vec<String>               = Vec::new(),
         rustfmt_overrideCommand: Option<Vec<String>> = None,
 
-        withSysroot: bool = true,
         rustcSource : Option<String> = None,
     }
 }
diff --git a/crates/rust-analyzer/src/reload.rs b/crates/rust-analyzer/src/reload.rs
index 11c8d0e5f..fa6e09f42 100644
--- a/crates/rust-analyzer/src/reload.rs
+++ b/crates/rust-analyzer/src/reload.rs
@@ -96,17 +96,12 @@ impl GlobalState {
         self.task_pool.handle.spawn({
             let linked_projects = self.config.linked_projects.clone();
             let cargo_config = self.config.cargo.clone();
-            let with_sysroot = self.config.with_sysroot.clone();
             move || {
                 let workspaces = linked_projects
                     .iter()
                     .map(|project| match project {
                         LinkedProject::ProjectManifest(manifest) => {
-                            project_model::ProjectWorkspace::load(
-                                manifest.clone(),
-                                &cargo_config,
-                                with_sysroot,
-                            )
+                            project_model::ProjectWorkspace::load(manifest.clone(), &cargo_config)
                         }
                         LinkedProject::InlineJsonProject(it) => {
                             project_model::ProjectWorkspace::load_inline(it.clone())
diff --git a/crates/rust-analyzer/tests/rust-analyzer/support.rs b/crates/rust-analyzer/tests/rust-analyzer/support.rs
index fe9362bc0..b210b98f0 100644
--- a/crates/rust-analyzer/tests/rust-analyzer/support.rs
+++ b/crates/rust-analyzer/tests/rust-analyzer/support.rs
@@ -12,7 +12,7 @@ use lsp_types::{
     notification::Exit, request::Shutdown, TextDocumentIdentifier, Url, WorkDoneProgress,
 };
 use lsp_types::{ProgressParams, ProgressParamsValue};
-use project_model::ProjectManifest;
+use project_model::{CargoConfig, ProjectManifest};
 use rust_analyzer::{
     config::{ClientCapsConfig, Config, FilesConfig, FilesWatcher, LinkedProject},
     main_loop,
@@ -47,8 +47,8 @@ impl<'a> Project<'a> {
         self
     }
 
-    pub(crate) fn with_sysroot(mut self, sysroot: bool) -> Project<'a> {
-        self.with_sysroot = sysroot;
+    pub(crate) fn with_sysroot(mut self, yes: bool) -> Project<'a> {
+        self.with_sysroot = yes;
         self
     }
 
@@ -90,7 +90,7 @@ impl<'a> Project<'a> {
                 work_done_progress: true,
                 ..Default::default()
             },
-            with_sysroot: self.with_sysroot,
+            cargo: CargoConfig { no_sysroot: !self.with_sysroot, ..Default::default() },
             linked_projects,
             files: FilesConfig { watcher: FilesWatcher::Client, exclude: Vec::new() },
             ..Config::new(tmp_dir_path)