--- a/rust/chg/src/message.rs	Mon Nov 19 20:50:45 2018 +0900
+++ b/rust/chg/src/message.rs	Tue Mar 31 23:25:26 2020 +0900
@@ -152,7 +152,7 @@
 
 fn new_parse_error<E>(error: E) -> io::Error
 where
-    E: Into<Box<error::Error + Send + Sync>>,
+    E: Into<Box<dyn error::Error + Send + Sync>>,
 {
     io::Error::new(io::ErrorKind::InvalidData, error)
 }