diff --git a/src/stepper.rs b/src/stepper.rs
index db9e367..6307909 100644
--- a/src/stepper.rs
+++ b/src/stepper.rs
@@ -21,15 +21,6 @@ pub trait PollStep<C, S>: StepError {
     }
 }
 
-/*
-impl<C, S, Stepper: Step<C, Poll<S>>> PollStep<C, S> for Stepper {
-    #[inline]
-    fn poll_step(&mut self, context: &mut C) -> Poll<Result<S, Self::Error>> {
-        self.step(context)?.map(Ok)
-    }
-}
-*/
-
 impl<C, S, Stepper: PollStep<C, S>> Step<C, Poll<S>> for Stepper {
     #[inline]
     fn step(&mut self, context: &mut C) -> Result<Poll<S>, Self::Error> {
@@ -40,10 +31,6 @@ impl<C, S, Stepper: PollStep<C, S>> Step<C, Poll<S>> for Stepper {
     }
 }
 
-pub trait StepBack<C, S>: StepError {
-    fn step_back(&mut self, context: &mut C) -> Result<S, Self::Error>;
-}
-
 pub trait Abort<C> {
     fn abort(&mut self, context: &mut C);
 }