Merge #4580

4580: Fix invoking cargo without consulting CARGO env var or standard installation paths r=matklad a=Veetaha

Followup for #4329

The pr essentially fixes [this bug](https://youtu.be/EzQ7YIIo1rY?t=2189)

cc @lefticus

Co-authored-by: veetaha <veetaha2@gmail.com>

crates/ra_proc_macro_srv/Cargo.toml

@@ -22,3 +22,4 @@ cargo_metadata = "0.10.0"
 difference = "2.0.0"
 # used as proc macro test target
 serde_derive = "1.0.106"
+ra_toolchain = { path = "../ra_toolchain" }

crates/ra_proc_macro_srv/src/tests/utils.rs

@@ -2,7 +2,6 @@
 
 use crate::dylib;
 use crate::ProcMacroSrv;
-pub use difference::Changeset as __Changeset;
 use ra_proc_macro::ListMacrosTask;
 use std::str::FromStr;
 use test_utils::assert_eq_text;
@@ -13,7 +12,7 @@ mod fixtures {
 
     // Use current project metadata to get the proc-macro dylib path
     pub fn dylib_path(crate_name: &str, version: &str) -> std::path::PathBuf {
-        let command = Command::new("cargo")
+        let command = Command::new(ra_toolchain::cargo())
             .args(&["check", "--message-format", "json"])
             .output()
             .unwrap()

crates/rust-analyzer/src/lsp_ext.rs

@@ -121,12 +121,21 @@ pub struct RunnablesParams {
     pub position: Option<Position>,
 }
 
+// Must strictly correspond to the executable name
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "lowercase")]
+pub enum RunnableKind {
+    Cargo,
+    Rustc,
+    Rustup,
+}
+
 #[derive(Deserialize, Serialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct Runnable {
     pub range: Range,
     pub label: String,
-    pub bin: String,
+    pub kind: RunnableKind,
     pub args: Vec<String>,
     pub extra_args: Vec<String>,
     pub env: FxHashMap<String, String>,

crates/rust-analyzer/src/main_loop/handlers.rs

@@ -426,7 +426,7 @@ pub fn handle_runnables(
                 res.push(lsp_ext::Runnable {
                     range: Default::default(),
                     label: format!("cargo {} -p {}", cmd, spec.package),
-                    bin: "cargo".to_string(),
+                    kind: lsp_ext::RunnableKind::Cargo,
                     args: vec![cmd.to_string(), "--package".to_string(), spec.package.clone()],
                     extra_args: Vec::new(),
                     env: FxHashMap::default(),
@@ -438,7 +438,7 @@ pub fn handle_runnables(
             res.push(lsp_ext::Runnable {
                 range: Default::default(),
                 label: "cargo check --workspace".to_string(),
-                bin: "cargo".to_string(),
+                kind: lsp_ext::RunnableKind::Cargo,
                 args: vec!["check".to_string(), "--workspace".to_string()],
                 extra_args: Vec::new(),
                 env: FxHashMap::default(),
@@ -982,10 +982,11 @@ fn to_lsp_runnable(
             target.map_or_else(|| "run binary".to_string(), |t| format!("run {}", t))
         }
     };
+
     Ok(lsp_ext::Runnable {
         range: to_proto::range(&line_index, runnable.range),
         label,
-        bin: "cargo".to_string(),
+        kind: lsp_ext::RunnableKind::Cargo,
         args,
         extra_args,
         env: {

crates/rust-analyzer/tests/heavy_tests/main.rs

@@ -79,7 +79,7 @@ fn foo() {
           {
             "args": [ "test" ],
             "extraArgs": [ "foo", "--nocapture" ],
-            "bin": "cargo",
+            "kind": "cargo",
             "env": { "RUST_BACKTRACE": "short" },
             "cwd": null,
             "label": "test foo",
@@ -91,7 +91,7 @@ fn foo() {
           {
             "args": ["check", "--workspace"],
             "extraArgs": [],
-            "bin": "cargo",
+            "kind": "cargo",
             "env": {},
             "cwd": null,
             "label": "cargo check --workspace",
@@ -141,7 +141,7 @@ fn main() {}
             {
               "args": [ "test", "--package", "foo", "--test", "spam" ],
               "extraArgs": [ "test_eggs", "--exact", "--nocapture" ],
-              "bin": "cargo",
+              "kind": "cargo",
               "env": { "RUST_BACKTRACE": "short" },
               "label": "test test_eggs",
               "range": {
@@ -153,7 +153,7 @@ fn main() {}
             {
               "args": [ "check", "--package", "foo" ],
               "extraArgs": [],
-              "bin": "cargo",
+              "kind": "cargo",
               "env": {},
               "label": "cargo check -p foo",
               "range": {
@@ -165,7 +165,7 @@ fn main() {}
             {
               "args": [ "test", "--package", "foo" ],
               "extraArgs": [],
-              "bin": "cargo",
+              "kind": "cargo",
               "env": {},
               "label": "cargo test -p foo",
               "range": {