diff --git a/src/check_ast.rs b/src/check_ast.rs
index e4a19155e4..871d34ec17 100644
--- a/src/check_ast.rs
+++ b/src/check_ast.rs
@@ -380,8 +380,7 @@ where
                     self.checks.extend(
                         targets
                             .iter()
-                            .map(|target| checks::check_ambiguous_variable_name(target))
-                            .flatten(),
+                            .flat_map(checks::check_ambiguous_variable_name),
                     );
                 }
             }