From 9a3b1d382e976c5f9a8f8318b908a0d0355d19c4 Mon Sep 17 00:00:00 2001
From: Alexx Roche <github@alexx.net>
Date: Mon, 8 Jun 2020 15:27:18 +0200
Subject: [PATCH] Passively introduce attributes

Ensure that std::sync::Arc is actually used, as this exercise can be compiled using things already learnt in previous exercises.
---
 exercises/standard_library_types/arc1.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/exercises/standard_library_types/arc1.rs b/exercises/standard_library_types/arc1.rs
index 9784e84..07932c6 100644
--- a/exercises/standard_library_types/arc1.rs
+++ b/exercises/standard_library_types/arc1.rs
@@ -6,6 +6,7 @@
 
 // I AM NOT DONE
 
+#![forbid(unused_imports)] // Do not change this, (or the next) line.
 use std::sync::Arc;
 use std::thread;