diff --git a/src/rstd/inlining.rs b/src/rstd/inlining.rs
index e190ad7..51bea64 100644
--- a/src/rstd/inlining.rs
+++ b/src/rstd/inlining.rs
@@ -17,6 +17,8 @@ pub trait Inlining: Sized {
         ok: impl FnOnce(&[u8]) -> A,
         err: impl FnOnce(&[u8]) -> E,
     ) -> Result<(A, Self), E>;
+
+    fn itell(&self) -> usize;
 }
 
 pub trait InliningExt<E>: Inlining {
@@ -44,6 +46,10 @@ impl<D: ?Sized + Deserializer> Inlining for &mut D {
             Err(err(slice))
         }
     }
+
+    fn itell(&self) -> usize {
+        self.tell()
+    }
 }
 
 pub trait InCtx<'a, Ctx: Context<'a>>: Inlining {}
@@ -64,6 +70,10 @@ impl<'a: 'c, 'c, Ctx: Context<'a>> Inlining for InCtxT<'a, 'c, Ctx> {
             Err(e) => Err(e),
         }
     }
+
+    fn itell(&self) -> usize {
+        self.dectx.tell()
+    }
 }
 
 impl<'a: 'c, 'c, Ctx: Context<'a>> InCtx<'a, Ctx> for InCtxT<'a, 'c, Ctx> {}