Fix warnings: dyn

parity/light_helpers/epoch_fetch.rs

@@ -35,7 +35,7 @@ use parking_lot::RwLock;
 
 const ALL_VALID_BACKREFS: &str = "no back-references, therefore all back-references valid; qed";
 
-type BoxFuture<T, E> = Box<Future<Item = T, Error = E>>;
+type BoxFuture<T, E> = Box<dyn Future<Item = T, Error = E>>;
 
 /// Allows on-demand fetch of data useful for the light client.
 pub struct EpochFetch {
@@ -88,8 +88,8 @@ impl ChainDataFetcher for EpochFetch {
     fn epoch_transition(
         &self,
         hash: H256,
-        engine: Arc<EthEngine>,
-        checker: Arc<StateDependentProof<EthereumMachine>>,
+        engine: Arc<dyn EthEngine>,
+        checker: Arc<dyn StateDependentProof<EthereumMachine>>,
     ) -> Self::Transition {
         self.request(request::Signal {
             hash: hash,