From 0048d43713b65c5d0f893c13b6783ce4711e0bf1 Mon Sep 17 00:00:00 2001
From: zhongjn <2389206378@qq.com>
Date: Sun, 27 Dec 2020 22:50:32 +0800
Subject: [PATCH] macros: improve select! error message (#3352)

Co-authored-by: Alice Ryhl <alice@ryhl.io>
---
 tokio/src/macros/select.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs
index ca4f9630c..aa29105ec 100644
--- a/tokio/src/macros/select.rs
+++ b/tokio/src/macros/select.rs
@@ -446,7 +446,7 @@ macro_rules! select {
 
     (@ { $($t:tt)* } ) => {
         // No `else` branch
-        $crate::select!(@{ $($t)*; unreachable!() })
+        $crate::select!(@{ $($t)*; panic!("all branches are disabled and there is no else branch") })
     };
     (@ { $($t:tt)* } else => $else:expr $(,)?) => {
         $crate::select!(@{ $($t)*; $else })