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macros: improve select! error message (#3352)

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Co-authored-by: Alice Ryhl <alice@ryhl.io>
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zhongjn 2020-12-27 22:50:32 +08:00 committed by GitHub
parent 770044caa7
commit 0048d43713
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tokio/src/macros/select.rs
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@ -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 })