fix race with dropping mpsc::Receiver #1241
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Fix a bug where messages sent into a channel at the same time as the `Receiver` is dropped are never removed. Fixes rust-lang#909
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seanmonstar
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Sep 2, 2018
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seanmonstar
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Previously reviewed this for tokio, and this is a backport, so r+.
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Fix a bug where messages sent into a channel at the same time as the
Receiveris dropped are never removed.The impl in 0.3 suffers the same bug.
Fixes #909