Fix warnings

exercises/10_modules/modules2.rs

@@ -1,6 +1,7 @@
 // You can bring module paths into scopes and provide new names for them with
 // the `use` and `as` keywords.
 
+#[allow(dead_code)]
 mod delicious_snacks {
     // TODO: Add the following two `use` statements after fixing them.
     // use self::fruits::PEAR as ???;