diff --git a/src/rstd/inlining.rs b/src/rstd/inlining.rs
index d501964..359cdc7 100644
--- a/src/rstd/inlining.rs
+++ b/src/rstd/inlining.rs
@@ -17,8 +17,10 @@ pub trait InlineableDeserializer: Sized {
         ok: impl FnOnce(&[u8]) -> A,
         err: impl FnOnce(&[u8]) -> E,
     ) -> Result<(A, Self), E>;
+}
 
-    fn iread_n_const<const N: usize, E>(
+pub trait InlineableDeserializerExt<E>: InlineableDeserializer {
+    fn iread_n_const<const N: usize>(
         self,
         err: impl FnOnce(&[u8]) -> E,
     ) -> Result<([u8; N], Self), E> {
@@ -26,6 +28,8 @@ pub trait InlineableDeserializer: Sized {
     }
 }
 
+impl<D: InlineableDeserializer, E> InlineableDeserializerExt<E> for D {}
+
 impl<D: ?Sized + Deserializer> InlineableDeserializer for &mut D {
     fn iread_n<A, E>(
         self,