diff --git a/src/roxy.rs b/src/roxy.rs
index a4264da..bd80992 100644
--- a/src/roxy.rs
+++ b/src/roxy.rs
@@ -8,16 +8,16 @@ use crate::error::Error;
 
 pub trait Parse {
     fn parse(&mut self, path: &str, src: &[u8], dst: &mut Vec<u8>) -> Result<(), Error>;
-}
 
-impl<'a, P: Parse + 'static> Into<Box<dyn Parse>> for (P,) {
-    fn into(self) -> Box<dyn Parse> {
-        Box::new(self.0)
+    fn as_dyn(&self) -> &dyn Parse where Self: Sized {
+        self
     }
 }
 
-pub trait AndThenParser<P> {
-    fn and_then(&mut self, parser: P) -> &Self;
+impl<P: Parse + 'static> Into<Box<dyn Parse>> for (P,) {
+    fn into(self) -> Box<dyn Parse> {
+        Box::new(self.0)
+    }
 }
 
 pub struct Parser<'a> {