socket closed after UnixStream::into_raw_fd()

[yshui]

async-std/src/os/unix/net/stream.rs

Lines 253 to 257 in dbc98fa

	impl IntoRawFd for UnixStream {
	fn into_raw_fd(self) -> RawFd {
	self.as_raw_fd()
	}
	}

.as_raw_fd doesn't take the ownership of the fd, so the fd is closed when self is dropped. This was #147 , which was fixed, then apparently reintroduced.

I thought I added a test case to catch this....

[yshui]

Ah, the test case only covers UnixDatagram. I could've done better..