Breaking change in 1.0.1

[ETKNeil]

1.0.0 is fine but 1.0.1 does not compile

error[E0277]: the trait bound `Socket: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:236:13
    |
236 | unsafe impl SocketlikeViewType for socket2::Socket {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `Socket`
    |
    = help: the following other types implement trait `From<T>`:
              <Socket as From<std::net::TcpListener>>
              <Socket as From<std::net::TcpStream>>
              <Socket as From<std::net::UdpSocket>>
              <Socket as From<std::os::unix::net::UnixDatagram>>
              <Socket as From<std::os::unix::net::UnixListener>>
              <Socket as From<std::os::unix::net::UnixStream>>
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<Socket>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:236:13
    |
236 | unsafe impl SocketlikeViewType for socket2::Socket {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<Socket>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `Socket`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::TcpStream: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:258:13
    |
258 | unsafe impl SocketlikeViewType for mio::net::TcpStream {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::TcpStream`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::TcpStream>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:258:13
    |
258 | unsafe impl SocketlikeViewType for mio::net::TcpStream {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::TcpStream>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::TcpStream`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::TcpListener: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:260:13
    |
260 | unsafe impl SocketlikeViewType for mio::net::TcpListener {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::TcpListener`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::TcpListener>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:260:13
    |
260 | unsafe impl SocketlikeViewType for mio::net::TcpListener {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::TcpListener>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::TcpListener`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::UdpSocket: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:262:13
    |
262 | unsafe impl SocketlikeViewType for mio::net::UdpSocket {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::UdpSocket`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::UdpSocket>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:262:13
    |
262 | unsafe impl SocketlikeViewType for mio::net::UdpSocket {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::UdpSocket>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::UdpSocket`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::UnixDatagram: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:265:13
    |
265 | unsafe impl SocketlikeViewType for mio::net::UnixDatagram {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::UnixDatagram`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::UnixDatagram>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:265:13
    |
265 | unsafe impl SocketlikeViewType for mio::net::UnixDatagram {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::UnixDatagram>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::UnixDatagram`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::UnixListener: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:268:13
    |
268 | unsafe impl SocketlikeViewType for mio::net::UnixListener {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::UnixListener`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::UnixListener>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:268:13
    |
268 | unsafe impl SocketlikeViewType for mio::net::UnixListener {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::UnixListener>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::UnixListener`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::net::UnixStream: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:271:13
    |
271 | unsafe impl SocketlikeViewType for mio::net::UnixStream {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::net::UnixStream`
    |
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:38
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                      ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::net::UnixStream>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:271:13
    |
271 | unsafe impl SocketlikeViewType for mio::net::UnixStream {}
    |             ^^^^^^^^^^^^^^^^^^ the trait `From<mio::net::UnixStream>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::net::UnixStream`
note: required by a bound in `SocketlikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:43:55
    |
43  | pub unsafe trait SocketlikeViewType: FromSocketlike + IntoSocketlike {}
    |                                                       ^^^^^^^^^^^^^^ required by this bound in `SocketlikeViewType`

error[E0277]: the trait bound `mio::unix::pipe::Receiver: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:274:13
    |
274 | unsafe impl FilelikeViewType for mio::unix::pipe::Receiver {}
    |             ^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::unix::pipe::Receiver`
    |
    = help: the following other types implement trait `From<T>`:
              <mio::unix::pipe::Receiver as From<ChildStderr>>
              <mio::unix::pipe::Receiver as From<ChildStdout>>
note: required by a bound in `FilelikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:33:36
    |
33  | pub unsafe trait FilelikeViewType: FromFilelike + IntoFilelike {}
    |                                    ^^^^^^^^^^^^ required by this bound in `FilelikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::unix::pipe::Receiver>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:274:13
    |
274 | unsafe impl FilelikeViewType for mio::unix::pipe::Receiver {}
    |             ^^^^^^^^^^^^^^^^ the trait `From<mio::unix::pipe::Receiver>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::unix::pipe::Receiver`
note: required by a bound in `FilelikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:33:51
    |
33  | pub unsafe trait FilelikeViewType: FromFilelike + IntoFilelike {}
    |                                                   ^^^^^^^^^^^^ required by this bound in `FilelikeViewType`

error[E0277]: the trait bound `mio::unix::pipe::Sender: From<OwnedFd>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:277:13
    |
277 | unsafe impl FilelikeViewType for mio::unix::pipe::Sender {}
    |             ^^^^^^^^^^^^^^^^ the trait `From<OwnedFd>` is not implemented for `mio::unix::pipe::Sender`
    |
    = help: the trait `From<ChildStdin>` is implemented for `mio::unix::pipe::Sender`
note: required by a bound in `FilelikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:33:36
    |
33  | pub unsafe trait FilelikeViewType: FromFilelike + IntoFilelike {}
    |                                    ^^^^^^^^^^^^ required by this bound in `FilelikeViewType`

error[E0277]: the trait bound `OwnedFd: From<mio::unix::pipe::Sender>` is not satisfied
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:277:13
    |
277 | unsafe impl FilelikeViewType for mio::unix::pipe::Sender {}
    |             ^^^^^^^^^^^^^^^^ the trait `From<mio::unix::pipe::Sender>` is not implemented for `OwnedFd`
    |
    = help: the following other types implement trait `From<T>`:
              <OwnedFd as From<ChildStderr>>
              <OwnedFd as From<ChildStdin>>
              <OwnedFd as From<ChildStdout>>
              <OwnedFd as From<File>>
              <OwnedFd as From<PidFd>>
              <OwnedFd as From<PipeReader>>
              <OwnedFd as From<PipeWriter>>
              <OwnedFd as From<std::net::TcpListener>>
            and 5 others
    = note: required because of the requirements on the impl of `Into<OwnedFd>` for `mio::unix::pipe::Sender`
note: required by a bound in `FilelikeViewType`
   --> /home/r/.cargo/registry/src/github.com-1ecc6299db9ec823/io-lifetimes-1.0.1/src/views.rs:33:51
    |
33  | pub unsafe trait FilelikeViewType: FromFilelike + IntoFilelike {}
    |                                                   ^^^^^^^^^^^^ required by this bound in `FilelikeViewType`

For more information about this error, try `rustc --explain E0277`.
error: could not compile `io-lifetimes` due to 18 previous errors

[sunfishcode]

It turns out that socket2 and mio support in io-lifetimes 1.0 only worked by accident, and didn't work at all in older Rust versions that io-lifetimes intends to support. Upstream socket2 and mio have not yet implemented the std version of the I/O safety traits. Until they do so, io-lifetimes 1.0 won't be able to meaningfully support the "socket2" or "mio" features.

For users that need mio or socket2 support, I'm also continuing to maintain io-lifetimes 0.7, which doesn't use the traits in std, so it is able to support socket2 and mio.

[sunfishcode]

In retrospect I'm not sure I made the right call earlier. It may have been better to fix this in a 2.0.0 release. But at this point, I haven't seen any other reports of this problem, users that need the "socket2" or "mio" features will need to stick with 0.7 for now anyway, and releasing a 2.0.0 would create a lot of churn, so I don't think there's anything else to do here.