[INFO] cloning repository https://github.com/bon-chi/mio_echo_server
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bon-chi/mio_echo_server" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Fmio_echo_server", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Fmio_echo_server'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] df24ffad142a840bc696d491bebfac448a92376e
[INFO] testing bon-chi/mio_echo_server against beta-2020-10-09 for beta-1.48-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbon-chi%2Fmio_echo_server" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bon-chi/mio_echo_server on toolchain beta-2020-10-09
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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 /workspace/builds/worker-11/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 `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /workspace/builds/worker-11/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] [stderr] If you want to try to generate the lock file without accessing the network, use the --offline flag.
[INFO] the lockfile is outdated, regenerating it
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-10-09" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 550b2f1b77f2ced5a87a10d7ff842efafb7889c84aaf182a3fced1159d937dcc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "550b2f1b77f2ced5a87a10d7ff842efafb7889c84aaf182a3fced1159d937dcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "550b2f1b77f2ced5a87a10d7ff842efafb7889c84aaf182a3fced1159d937dcc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "550b2f1b77f2ced5a87a10d7ff842efafb7889c84aaf182a3fced1159d937dcc", kill_on_drop: false }`
[INFO] [stdout] 550b2f1b77f2ced5a87a10d7ff842efafb7889c84aaf182a3fced1159d937dcc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-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" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-10-09" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 041ea9dd4f23342f8fbb037234ae4c30fb7061b39b200c197b87f80440c635b6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "041ea9dd4f23342f8fbb037234ae4c30fb7061b39b200c197b87f80440c635b6", kill_on_drop: false }`
[INFO] [stderr]    Compiling bytes v0.3.0
[INFO] [stderr]    Compiling slab v0.1.3
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]    Compiling net2 v0.2.35
[INFO] [stderr]    Compiling nix v0.5.1
[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] [stdout] error[E0308]: `match` arms have incompatible types
[INFO] [stdout]    --> src/main.rs:100:18
[INFO] [stdout]     |
[INFO] [stdout] 98  |           let event_set = match self.state {
[INFO] [stdout]     |  _________________________-
[INFO] [stdout] 99  | |             State::Reading(..) => EventSet::readable(),
[INFO] [stdout]     | |                                   -------------------- this is found to be of type `mio::EventSet`
[INFO] [stdout] 100 | |             _ => {}
[INFO] [stdout]     | |                  ^^ expected struct `mio::EventSet`, found `()`
[INFO] [stdout] 101 | |         };
[INFO] [stdout]     | |_________- `match` arms have incompatible types
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/main.rs:122:33
[INFO] [stdout]     |
[INFO] [stdout] 122 |     fn unwrap_read_buf(self) -> Vec<u8> {}
[INFO] [stdout]     |        ---------------          ^^^^^^^ expected struct `Vec`, found `()`
[INFO] [stdout]     |        |
[INFO] [stdout]     |        implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected struct `Vec<u8>`
[INFO] [stdout]             found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mio_echo_server`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "041ea9dd4f23342f8fbb037234ae4c30fb7061b39b200c197b87f80440c635b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "041ea9dd4f23342f8fbb037234ae4c30fb7061b39b200c197b87f80440c635b6", kill_on_drop: false }`
[INFO] [stdout] 041ea9dd4f23342f8fbb037234ae4c30fb7061b39b200c197b87f80440c635b6
