sync::oneshot::{Try,}{Send,Recv}Error{<T>,}: Added send + recv + generic error (with consuming variants for re-triable operations.)

Fortune for reverse's current commit: Small blessing − 小吉

src/sync/mod.rs

@@ -58,19 +58,25 @@ pub mod oneshot {
 	Cancelled,
     }
 
+    //TODO: Add impl Send/RecvError: `fn can_retry(&self) -> bool`
+    
     impl fmt::Display for SendError
     {
+	#[inline(always)] 
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
 	{
-	    todo!("`Sender<T>` Error message")
+	    f.write_str("send error")
+	    // TODO: Should we `match self` for detailed error messages here?
 	}
     }
 
     impl fmt::Display for RecvError
     {
+	#[inline(always)]
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
 	{
-	    todo!("`Receiver<T>` Error message")
+	    f.write_str("recv error")
+	    // TODO: Should we `match self` for detailed error messages here?
 	}
     }
 
@@ -93,10 +99,7 @@ pub mod oneshot {
 	#[inline(always)] 
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
 	{
-	    match self {
+	    f.write_str("oneshot error")
-		Self::Recv(_) => f.write_str("recv error"),
-		Self::Send(_) => f.write_str("send error"),
-	    }
 	}
     }
 
@@ -129,6 +132,55 @@ pub mod oneshot {
     }
 
     //TODO: impl fmt::Display error::Error for Try*Error[<T>]...
+    impl<T> fmt::Display for TrySendError<T>
+    {
+	#[inline] 
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+	{
+	    write!(f, "send error (T = {})", std::any::type_name::<T>())
+	}
+    }
+    impl<T> fmt::Display for TryRecvError<T>
+    {
+	#[inline] 
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+	{
+	    write!(f, "recv error (T = {})", std::any::type_name::<T>())
+	}
+    }
+    impl<T> error::Error for TryRecvError<T>
+	where T: fmt::Debug
+    {
+	#[inline] 
+	fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+	    Some(&self.0)
+	}
+    }
+    impl<T> error::Error for TrySendError<T>
+	where T: fmt::Debug
+    {
+	#[inline] 
+	fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+	    Some(&self.0)
+	}
+    }
+    impl<T> fmt::Display for TryError<T>
+    {
+	#[inline] 
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+	{
+	    write!(f, "oneshot error (T = {})", std::any::type_name::<T>())
+	}
+    }
+    impl<T> error::Error for TryError<T>
+	where T: fmt::Debug
+    {
+	#[inline] 
+	fn source(&self) -> Option<&(dyn error::Error + 'static)> {
+	    Some(&self.0)
+	}
+    }
+
     //TODO: XXX: We might also want explicit `Debug` impls for all `Try*Error<T>`s, since `T` is irrelevent to the `Error` part.
 
     /// Error when attempting to send a value using a `try_` function.