[INFO] updating cached repository https://github.com/sinitcin/poll_engine
[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] a840d4f7d6f69a6169027e6365191478f2a6edb5
[INFO] testing sinitcin/poll_engine against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsinitcin%2Fpoll_engine" "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/sinitcin/poll_engine 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/sinitcin/poll_engine
[INFO] finished tweaking git repo https://github.com/sinitcin/poll_engine
[INFO] tweaked toml for git repo https://github.com/sinitcin/poll_engine written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/sinitcin/poll_engine 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] 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] e5bd3175ef933c67c3818c11d6c08b6e1a1569d680c02bbeebf1bd1ae9beebc2
[INFO] running `"docker" "start" "-a" "e5bd3175ef933c67c3818c11d6c08b6e1a1569d680c02bbeebf1bd1ae9beebc2"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling serial-core v0.4.0
[INFO] [stderr]    Compiling termios v0.2.2
[INFO] [stderr]    Compiling ioctl-rs v0.1.6
[INFO] [stderr]    Compiling uuid v0.5.1
[INFO] [stderr]    Compiling serial-unix v0.4.0
[INFO] [stderr]    Compiling serial v0.4.0
[INFO] [stderr]    Compiling channel v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(int_to_from_bytes)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:21:31
[INFO] [stderr]    |
[INFO] [stderr] 21 | type ISerialPort = Rc<RefCell<SerialPort>>;
[INFO] [stderr]    |                               ^^^^^^^^^^ help: use `dyn`: `dyn SerialPort`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:46:32
[INFO] [stderr]    |
[INFO] [stderr] 46 |     fn new(channel: Rc<RefCell<ILinkChannel>>) -> Self
[INFO] [stderr]    |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn ILinkChannel`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:74:36
[INFO] [stderr]    |
[INFO] [stderr] 74 |     fn parent(&self) -> Rc<RefCell<ILinkChannel>>;
[INFO] [stderr]    |                                    ^^^^^^^^^^^^ help: use `dyn`: `dyn ILinkChannel`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:99:28
[INFO] [stderr]    |
[INFO] [stderr] 99 |     _child: Vec<Rc<RefCell<ICounter>>>,
[INFO] [stderr]    |                            ^^^^^^^^ help: use `dyn`: `dyn ICounter`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:152:25
[INFO] [stderr]     |
[INFO] [stderr] 152 |     _parent: Rc<RefCell<ILinkChannel>>,
[INFO] [stderr]     |                         ^^^^^^^^^^^^ help: use `dyn`: `dyn ILinkChannel`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:162:32
[INFO] [stderr]     |
[INFO] [stderr] 162 |     fn new(channel: Rc<RefCell<ILinkChannel>>) -> Self {
[INFO] [stderr]     |                                ^^^^^^^^^^^^ help: use `dyn`: `dyn ILinkChannel`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/main.rs:260:36
[INFO] [stderr]     |
[INFO] [stderr] 260 |     fn parent(&self) -> Rc<RefCell<ILinkChannel>> {
[INFO] [stderr]     |                                    ^^^^^^^^^^^^ help: use `dyn`: `dyn ILinkChannel`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `channel`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e5bd3175ef933c67c3818c11d6c08b6e1a1569d680c02bbeebf1bd1ae9beebc2"`
[INFO] running `"docker" "rm" "-f" "e5bd3175ef933c67c3818c11d6c08b6e1a1569d680c02bbeebf1bd1ae9beebc2"`
[INFO] [stdout] e5bd3175ef933c67c3818c11d6c08b6e1a1569d680c02bbeebf1bd1ae9beebc2