Cover scoped stale-byte deallocation

src/tests.rs

@@ -924,6 +924,26 @@ fn test_scoped_guard_restores_after_panic_and_clears_stale_bytes() {
     assert_eq!(erased.capacity(), retained_capacity);
 }
 
+#[test]
+fn test_scoped_stale_bytes_are_safely_deallocated() {
+    let erased = {
+        let borrowed = String::from("borrowed");
+        let mut erased = TypeErasedVec::new(Vec::<&'static str>::with_capacity(2));
+
+        {
+            let mut guard = erased.as_type_scoped::<&str>();
+            guard.push(&borrowed);
+            assert_eq!(guard.as_slice(), &["borrowed"]);
+        }
+
+        erased
+    };
+
+    assert_eq!(erased.length(), 1);
+    assert_eq!(erased.capacity(), 2);
+    drop(erased);
+}
+
 #[test]
 fn test_unchecked_methods() {
     let vec = vec![123_u32];