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fail fast on io::ErrorKind::NotConnected (async-rs#21)

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Original file line number	Diff line number	Diff line change
`@@ -1222,6 +1222,9 @@ impl Async<UnixStream> {`
`1222`	`1222`	`// The stream becomes writable when connected.`
`1223`	`1223`	`stream.writable().await?;`
`1224`	`1224`
	`1225`	`+ // On Linux, it appears the socket may become writable even when connecting fails, so we`
	`1226`	`+ // must do an extra check here and see if the peer address is retrievable.`
	`1227`	`+ stream.get_ref().peer_addr()?;`
`1225`	`1228`	`Ok(stream)`
`1226`	`1229`	`}`
`1227`	`1230`

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