From 9a8d087c69fbc9fcf6c32481297de14a333d114c Mon Sep 17 00:00:00 2001
From: Taiki Endo <te316e89@gmail.com>
Date: Thu, 3 Jan 2019 07:12:11 +0900
Subject: [PATCH] Allow deprecated Error::cause (#818)

Error::cause is deprecated in Rust 1.33, but this allows Error::cause
until the minimum supported version of tokio is Rust 1.30.

When the minimum support version of tokio reaches Rust 1.30,
replace Error::cause with Error::source.

Fixes: #817
---
 src/runtime/current_thread/runtime.rs | 4 ++++
 tokio-timer/src/throttle.rs           | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/src/runtime/current_thread/runtime.rs b/src/runtime/current_thread/runtime.rs
index 262cb1e72..6bb2b0767 100644
--- a/src/runtime/current_thread/runtime.rs
+++ b/src/runtime/current_thread/runtime.rs
@@ -92,6 +92,10 @@ impl Error for RunError {
     fn description(&self) -> &str {
         self.inner.description()
     }
+
+    // FIXME(taiki-e): When the minimum support version of tokio reaches Rust 1.30,
+    // replace this with Error::source.
+    #[allow(deprecated)]
     fn cause(&self) -> Option<&Error> {
         self.inner.cause()
     }
diff --git a/tokio-timer/src/throttle.rs b/tokio-timer/src/throttle.rs
index c1da76bbf..12e889576 100644
--- a/tokio-timer/src/throttle.rs
+++ b/tokio-timer/src/throttle.rs
@@ -161,6 +161,9 @@ impl<T: StdError + 'static> StdError for ThrottleError<T> {
         }
     }
 
+    // FIXME(taiki-e): When the minimum support version of tokio reaches Rust 1.30,
+    // replace this with Error::source.
+    #[allow(deprecated)]
     fn cause(&self) -> Option<&StdError> {
         match self.0 {
             Either::A(ref err) => Some(err),