[INFO] updating cached repository https://github.com/bon-chi/mio_echo_server
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] df24ffad142a840bc696d491bebfac448a92376e
[INFO] testing bon-chi/mio_echo_server against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Fmio_echo_server" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bon-chi/mio_echo_server on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bon-chi/mio_echo_server
[INFO] finished tweaking git repo https://github.com/bon-chi/mio_echo_server
[INFO] tweaked toml for git repo https://github.com/bon-chi/mio_echo_server written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/bon-chi/mio_echo_server already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-1/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] f8c78d214d7b76dd36c008e942895e223f032e7c7e58e0dfb195f2e8c3de7dfa
[INFO] running `"docker" "start" "-a" "f8c78d214d7b76dd36c008e942895e223f032e7c7e58e0dfb195f2e8c3de7dfa"`
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]    Compiling miow v0.1.5
[INFO] [stderr]    Compiling mio v0.5.1
[INFO] [stderr]    Compiling mio_echo_server v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0308]: match arms have incompatible types
[INFO] [stderr]    --> src/main.rs:100:18
[INFO] [stderr]     |
[INFO] [stderr] 98  |           let event_set = match self.state {
[INFO] [stderr]     |  _________________________-
[INFO] [stderr] 99  | |             State::Reading(..) => EventSet::readable(),
[INFO] [stderr]     | |                                   -------------------- this is found to be of type `mio::EventSet`
[INFO] [stderr] 100 | |             _ => {}
[INFO] [stderr]     | |                  ^^ expected struct `mio::EventSet`, found ()
[INFO] [stderr] 101 | |         };
[INFO] [stderr]     | |_________- `match` arms have incompatible types
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `mio::EventSet`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error[E0308]: mismatched types
[INFO] [stderr]    --> src/main.rs:122:33
[INFO] [stderr]     |
[INFO] [stderr] 122 |     fn unwrap_read_buf(self) -> Vec<u8> {}
[INFO] [stderr]     |        ---------------          ^^^^^^^ expected struct `std::vec::Vec`, found ()
[INFO] [stderr]     |        |
[INFO] [stderr]     |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stderr]     |
[INFO] [stderr]     = note: expected type `std::vec::Vec<u8>`
[INFO] [stderr]                found type `()`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] error: could not compile `mio_echo_server`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f8c78d214d7b76dd36c008e942895e223f032e7c7e58e0dfb195f2e8c3de7dfa"`
[INFO] running `"docker" "rm" "-f" "f8c78d214d7b76dd36c008e942895e223f032e7c7e58e0dfb195f2e8c3de7dfa"`
[INFO] [stdout] f8c78d214d7b76dd36c008e942895e223f032e7c7e58e0dfb195f2e8c3de7dfa