Add test step for rust-analyzer, run it by default

Author: fasterthanlime

src/bootstrap/builder.rs

@@ -649,6 +649,7 @@ impl<'a> Builder<'a> {
                 test::Cargotest,
                 test::Cargo,
                 test::Rls,
+                test::RustAnalyzer,
                 test::ErrorIndex,
                 test::Distcheck,
                 test::RunMakeFullDeps,

src/bootstrap/test.rs

@@ -352,6 +352,55 @@ impl Step for Rls {
     }
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct RustAnalyzer {
+    stage: u32,
+    host: TargetSelection,
+}
+
+impl Step for RustAnalyzer {
+    type Output = ();
+    const ONLY_HOSTS: bool = true;
+    const DEFAULT: bool = true;
+
+    fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
+        run.path("src/tools/rust-analyzer")
+    }
+
+    fn make_run(run: RunConfig<'_>) {
+        run.builder.ensure(Self { stage: run.builder.top_stage, host: run.target });
+    }
+
+    /// Runs `cargo test` for rust-analyzer
+    fn run(self, builder: &Builder<'_>) {
+        let stage = self.stage;
+        let host = self.host;
+        let compiler = builder.compiler(stage, host);
+
+        builder.ensure(tool::RustAnalyzer { compiler, target: self.host }).expect("in-tree tool");
+
+        let path = "src/tools/rust-analyzer";
+        let mut cargo = tool::prepare_tool_cargo(
+            builder,
+            compiler,
+            Mode::ToolStd,
+            host,
+            "test",
+            path,
+            SourceType::InTree,
+            &["rust-analyzer/in-rust-tree".to_owned()],
+        );
+
+        let dir = builder.src.join(path);
+        cargo.env("CARGO_WORKSPACE_DIR", &dir);
+
+        cargo.add_rustc_lib_path(builder, compiler);
+        cargo.arg("--").args(builder.config.cmd.test_args());
+
+        builder.run(&mut cargo.into());
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Rustfmt {
     stage: u32,