--- a/src/lib.rs
+++ b/src/lib.rs
@@ -72,7 +72,6 @@
 #![deny(rust_2018_compatibility)]
 #![deny(rust_2018_idioms)]
 #![deny(warnings)]
-#![deny(const_err)]
 
 pub use binary_heap::BinaryHeap;
 pub use deque::Deque;