diff --git a/src/lib.rs b/src/lib.rs
index 6e9592abe..14aa246eb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,7 @@
 //! [CppCon talk]: https://www.youtube.com/watch?v=ncHmEUmJZf4
 
 #![no_std]
+#![cfg_attr(feature = "nightly", allow(internal_features))]
 #![cfg_attr(
     feature = "nightly",
     feature(
diff --git a/src/map.rs b/src/map.rs
index 9cd768f20..80025f1c4 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -6805,7 +6805,7 @@ mod test_map {
         assert_eq!(m2.len(), 2);
     }
 
-    thread_local! { static DROP_VECTOR: RefCell<Vec<i32>> = RefCell::new(Vec::new()) }
+    thread_local! { static DROP_VECTOR: RefCell<Vec<i32>> = const { RefCell::new(Vec::new()) } }
 
     #[derive(Hash, PartialEq, Eq)]
     struct Droppable {
diff --git a/src/set.rs b/src/set.rs
index 2f4a97c9d..3901ba7f1 100644
--- a/src/set.rs
+++ b/src/set.rs
@@ -2811,7 +2811,7 @@ mod test_set {
                 assert_eq!(last_i, 49);
             }
 
-            for _ in &s {
+            if s.iter().next().is_some() {
                 panic!("s should be empty!");
             }
 
@@ -2825,6 +2825,7 @@ mod test_set {
         use core::hash;
 
         #[derive(Debug)]
+        #[allow(dead_code)]
         struct Foo(&'static str, i32);
 
         impl PartialEq for Foo {