diff --git a/src/error.rs b/src/error.rs
index d6aee4f..353d8f2 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -5,3 +5,11 @@ pub enum Error {
     OutOfBounds(usize),
     BadBlockGroupCount(u32, u32),
 }
+
+impl From<Infallible> for Error {
+    fn from(_: Infallible) -> Error {
+        unreachable!()
+    }
+}
+
+pub enum Infallible {}