integration: run git checkout in git repo!

tests/integration.rs

@@ -175,18 +175,20 @@ fn integration_test_rustc() {
         .strip_prefix("commit-hash: ")
         .expect("failed parsing commit line");
 
+    dbg!(&commit);
     // check out the commit in the rustc repo to ensure clippy is compatible
 
     let st_git_checkout = Command::new("git")
         .arg("checkout")
         .arg(commit)
+        .current_dir("rust")
         .status()
         .expect("git failed to check out commit");
     assert!(st_git_checkout.success());
 
     let root_dir = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"));
     let target_dir = std::path::Path::new(&root_dir).join("target");
-    let clippy_binary = target_dir.join(env!("PROFILE")).join(CARGO_CLIPPY);
+    // let clippy_binary = target_dir.join(env!("PROFILE")).join(CARGO_CLIPPY);
 
     // we need to make sure that `x.py clippy` picks up our self-built clippy
     // try to make the target dir discoverable as PATH