4 files changed, 41 insertions, 14 deletions

diff --git a/crates/flycheck/src/lib.rs b/crates/flycheck/src/lib.rs
index ad376ad18..7c38f5ef9 100644
--- a/crates/flycheck/src/lib.rs
+++ b/crates/flycheck/src/lib.rs
@@ -24,6 +24,7 @@ pub enum FlycheckConfig {
         command: String,
         target_triple: Option<String>,
         all_targets: bool,
+        no_default_features: bool,
         all_features: bool,
         features: Vec<String>,
         extra_args: Vec<String>,
@@ -180,6 +181,7 @@ impl FlycheckActor {
             FlycheckConfig::CargoCommand {
                 command,
                 target_triple,
+                no_default_features,
                 all_targets,
                 all_features,
                 extra_args,
@@ -198,9 +200,14 @@ impl FlycheckActor {
                 }
                 if *all_features {
                     cmd.arg("--all-features");
-                } else if !features.is_empty() {
-                    cmd.arg("--features");
-                    cmd.arg(features.join(" "));
+                } else {
+                    if *no_default_features {
+                        cmd.arg("--no-default-features");
+                    }
+                    if !features.is_empty() {
+                        cmd.arg("--features");
+                        cmd.arg(features.join(" "));
+                    }
                 }
                 cmd.args(extra_args);
                 cmd
diff --git a/crates/ra_project_model/src/cargo_workspace.rs b/crates/ra_project_model/src/cargo_workspace.rs
index fb88e0f06..10513542e 100644
--- a/crates/ra_project_model/src/cargo_workspace.rs
+++ b/crates/ra_project_model/src/cargo_workspace.rs
@@ -144,12 +144,15 @@ impl CargoWorkspace {
         meta.manifest_path(cargo_toml.to_path_buf());
         if cargo_features.all_features {
             meta.features(CargoOpt::AllFeatures);
-        } else if cargo_features.no_default_features {
-            // FIXME: `NoDefaultFeatures` is mutual exclusive with `SomeFeatures`
-            // https://github.com/oli-obk/cargo_metadata/issues/79
-            meta.features(CargoOpt::NoDefaultFeatures);
-        } else if !cargo_features.features.is_empty() {
-            meta.features(CargoOpt::SomeFeatures(cargo_features.features.clone()));
+        } else {
+            if cargo_features.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 let Some(parent) = cargo_toml.parent() {
             meta.current_dir(parent.to_path_buf());
@@ -289,12 +292,16 @@ pub fn load_extern_resources(
     cmd.args(&["check", "--message-format=json", "--manifest-path"]).arg(cargo_toml);
     if cargo_features.all_features {
         cmd.arg("--all-features");
-    } else if cargo_features.no_default_features {
-        // FIXME: `NoDefaultFeatures` is mutual exclusive with `SomeFeatures`
-        // https://github.com/oli-obk/cargo_metadata/issues/79
-        cmd.arg("--no-default-features");
     } else {
-        cmd.args(&cargo_features.features);
+        if cargo_features.no_default_features {
+            // FIXME: `NoDefaultFeatures` is mutual exclusive with `SomeFeatures`
+            // https://github.com/oli-obk/cargo_metadata/issues/79
+            cmd.arg("--no-default-features");
+        }
+        if !cargo_features.features.is_empty() {
+            cmd.arg("--features");
+            cmd.arg(cargo_features.features.join(" "));
+        }
     }
 
     let output = cmd.output()?;
diff --git a/crates/rust-analyzer/src/config.rs b/crates/rust-analyzer/src/config.rs
index e11c8b909..70b4512d0 100644
--- a/crates/rust-analyzer/src/config.rs
+++ b/crates/rust-analyzer/src/config.rs
@@ -151,6 +151,7 @@ impl Config {
             flycheck: Some(FlycheckConfig::CargoCommand {
                 command: "check".to_string(),
                 target_triple: None,
+                no_default_features: false,
                 all_targets: true,
                 all_features: false,
                 extra_args: Vec::new(),
@@ -234,6 +235,9 @@ impl Config {
                     command: data.checkOnSave_command,
                     target_triple: data.checkOnSave_target.or(data.cargo_target),
                     all_targets: data.checkOnSave_allTargets,
+                    no_default_features: data
+                        .checkOnSave_noDefaultFeatures
+                        .unwrap_or(data.cargo_noDefaultFeatures),
                     all_features: data.checkOnSave_allFeatures.unwrap_or(data.cargo_allFeatures),
                     features: data.checkOnSave_features.unwrap_or(data.cargo_features),
                     extra_args: data.checkOnSave_extraArgs,
@@ -398,6 +402,7 @@ config_data! {
         checkOnSave_allFeatures: Option<bool>            = None,
         checkOnSave_allTargets: bool                     = true,
         checkOnSave_command: String                      = "check".into(),
+        checkOnSave_noDefaultFeatures: Option<bool>      = None,
         checkOnSave_target: Option<String>               = None,
         checkOnSave_extraArgs: Vec<String>               = Vec::new(),
         checkOnSave_features: Option<Vec<String>>        = None,
diff --git a/editors/code/package.json b/editors/code/package.json
index 658c913fd..1adf055d0 100644
--- a/editors/code/package.json
+++ b/editors/code/package.json
@@ -323,6 +323,14 @@
                     "default": true,
                     "markdownDescription": "Check all targets and tests (will be passed as `--all-targets`)"
                 },
+                "rust-analyzer.checkOnSave.noDefaultFeatures": {
+                    "type": [
+                        "null",
+                        "boolean"
+                    ],
+                    "default": null,
+                    "markdownDescription": "Do not activate the `default` feature"
+                },
                 "rust-analyzer.checkOnSave.allFeatures": {
                     "type": [
                         "null",