Auto merge of rust-lang#13669 - Veykril:jod-child, r=Veykril

Properly implement Drop for JodGroupChild

Author: bors

crates/flycheck/src/lib.rs

@@ -360,21 +360,28 @@ impl FlycheckActor {
     }
 }
 
-struct JodChild(GroupChild);
+struct JodGroupChild(GroupChild);
+
+impl Drop for JodGroupChild {
+    fn drop(&mut self) {
+        _ = self.0.kill();
+        _ = self.0.wait();
+    }
+}
 
 /// A handle to a cargo process used for fly-checking.
 struct CargoHandle {
     /// The handle to the actual cargo process. As we cannot cancel directly from with
     /// a read syscall dropping and therefore terminating the process is our best option.
-    child: JodChild,
+    child: JodGroupChild,
     thread: jod_thread::JoinHandle<io::Result<(bool, String)>>,
     receiver: Receiver<CargoMessage>,
 }
 
 impl CargoHandle {
     fn spawn(mut command: Command) -> std::io::Result<CargoHandle> {
         command.stdout(Stdio::piped()).stderr(Stdio::piped()).stdin(Stdio::null());
-        let mut child = command.group_spawn().map(JodChild)?;
+        let mut child = command.group_spawn().map(JodGroupChild)?;
 
         let stdout = child.0.inner().stdout.take().unwrap();
         let stderr = child.0.inner().stderr.take().unwrap();