diff --git a/rust/candid_parser/src/typing.rs b/rust/candid_parser/src/typing.rs
index f0d8a36b..807f3690 100644
--- a/rust/candid_parser/src/typing.rs
+++ b/rust/candid_parser/src/typing.rs
@@ -291,8 +291,9 @@ fn merge_actor(
                         let serv = env.te.as_service(&t)?;
                         let mut ms: Vec<_> = serv.iter().chain(meths.iter()).cloned().collect();
                         ms.sort_unstable_by(|a, b| a.0.partial_cmp(&b.0).unwrap());
-                        check_unique(ms.iter().map(|m| &m.0))
-                            .map_err(|e| Error::msg(format!("Duplicate imported method name: {e}")))?;
+                        check_unique(ms.iter().map(|m| &m.0)).map_err(|e| {
+                            Error::msg(format!("Duplicate imported method name: {e}"))
+                        })?;
                         let res: Type = TypeInner::Service(ms).into();
                         Ok(Some(res))
                     }