--- a/rust/chg/src/runcommand.rs	Mon Nov 19 20:50:45 2018 +0900
+++ b/rust/chg/src/runcommand.rs	Tue Mar 31 23:25:26 2020 +0900
@@ -37,7 +37,7 @@
     Finished,
 }
 
-type CommandPoll<C, H> = io::Result<(AsyncS<(Client<C>, H, i32), CommandState<C, H>>)>;
+type CommandPoll<C, H> = io::Result<AsyncS<(Client<C>, H, i32), CommandState<C, H>>>;
 
 /// Future resolves to `(exit_code, client)`.
 #[must_use = "futures do nothing unless polled"]