Require that UpdateListener::StopToken is Send

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## unreleased
 
+### Changed
+
+- `UpdateListener::StopToken` is now always `Send`
+
 ## 0.7.2 - 2022-03-23
 
 ### Added

src/dispatching/update_listeners.rs

@@ -53,7 +53,7 @@ pub use self::{
 /// [module-level documentation]: mod@self
 pub trait UpdateListener<E>: for<'a> AsUpdateStream<'a, E> {
     /// The type of token which allows to stop this listener.
-    type StopToken: StopToken;
+    type StopToken: StopToken + Send;
 
     /// Returns a token which stops this listener.
     ///  

src/dispatching/update_listeners/polling.rs

@@ -7,7 +7,7 @@ use futures::{
 
 use crate::{
     dispatching::{
-        stop_token::{AsyncStopFlag, AsyncStopToken, StopToken},
+        stop_token::{AsyncStopFlag, AsyncStopToken},
         update_listeners::{stateful_listener::StatefulListener, UpdateListener},
     },
     payloads::{GetUpdates, GetUpdatesSetters as _},
@@ -22,9 +22,7 @@ use crate::{
 /// ## Notes
 ///
 /// This function will automatically delete a webhook if it was set up.
-pub async fn polling_default<R>(
-    requester: R,
-) -> impl UpdateListener<R::Err, StopToken = impl Send + StopToken>
+pub async fn polling_default<R>(requester: R) -> impl UpdateListener<R::Err>
 where
     R: Requester + Send + 'static,
     <R as Requester>::GetUpdates: Send,
@@ -130,7 +128,7 @@ pub fn polling<R>(
     timeout: Option<Duration>,
     limit: Option<u8>,
     allowed_updates: Option<Vec<AllowedUpdate>>,
-) -> impl UpdateListener<R::Err, StopToken = impl Send + StopToken>
+) -> impl UpdateListener<R::Err>
 where
     R: Requester + Send + 'static,
     <R as Requester>::GetUpdates: Send,

src/dispatching/update_listeners/stateful_listener.rs

@@ -123,7 +123,7 @@ impl<St, Assf, Sf, Hauf, Stt, Thf, E> UpdateListener<E>
 where
     Self: for<'a> AsUpdateStream<'a, E>,
     Sf: FnMut(&mut St) -> Stt,
-    Stt: StopToken,
+    Stt: StopToken + Send,
     Hauf: FnMut(&mut St, &mut dyn Iterator<Item = AllowedUpdate>),
     Thf: Fn(&St) -> Option<Duration>,
 {