Temporarily allow clippy::return_self_not_must_use

Filed #333 to remind us to revert it later.

Author: nicholasbishop

src/result/completion.rs

@@ -1,3 +1,7 @@
+// TODO: workaround for
+// https://github.com/rust-lang/rust-clippy/issues/8140
+#![allow(clippy::return_self_not_must_use)]
+
 use super::Status;
 use log::warn;