[INFO] updating cached repository forestoden6/RustChat
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/forestoden6/RustChat
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/forestoden6/RustChat" "work/ex/beta-1.38-1/sources/1.37.0/gh/forestoden6/RustChat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/forestoden6/RustChat'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/forestoden6/RustChat" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/forestoden6/RustChat"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/forestoden6/RustChat'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c7acfb917d1165eb907dcddf70aac824d8820a7e
[INFO] sha for GitHub repo forestoden6/RustChat: c7acfb917d1165eb907dcddf70aac824d8820a7e
[INFO] validating manifest of forestoden6/RustChat on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of forestoden6/RustChat on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing forestoden6/RustChat
[INFO] finished frobbing forestoden6/RustChat
[INFO] frobbed toml for forestoden6/RustChat written to work/ex/beta-1.38-1/sources/1.37.0/gh/forestoden6/RustChat/Cargo.toml
[INFO] started frobbing forestoden6/RustChat
[INFO] finished frobbing forestoden6/RustChat
[INFO] frobbed toml for forestoden6/RustChat written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/forestoden6/RustChat/Cargo.toml
[INFO] crate forestoden6/RustChat already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/forestoden6/RustChat/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing forestoden6/RustChat against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/forestoden6/RustChat:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 55251d55cb9030ce3a0a84b86558f5d1f04f0f13e6fbc94ae5496fdc595483f7
[INFO] running `"docker" "start" "-a" "55251d55cb9030ce3a0a84b86558f5d1f04f0f13e6fbc94ae5496fdc595483f7"`
[INFO] [stderr]    Compiling spin v0.4.10
[INFO] [stderr]    Compiling slab v0.2.0
[INFO] [stderr]    Compiling owning_ref v0.2.4
[INFO] [stderr]    Compiling context v1.0.1
[INFO] [stderr]    Compiling nix v0.6.0
[INFO] [stderr]    Compiling mioco v0.8.1
[INFO] [stderr] error[E0446]: private type `src::sync::mpsc::ReceiverCore<T>` in public interface
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mioco-0.8.1/src/sync/mpsc.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct ReceiverCore<T> {
[INFO] [stderr]    | - `src::sync::mpsc::ReceiverCore<T>` declared as private
[INFO] [stderr] ...
[INFO] [stderr] 35 |     type Raw = ReceiverCore<T>;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't leak private type
[INFO] [stderr] 
[INFO] [stderr] error[E0446]: private type `src::timer::TimerCore` in public interface
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mioco-0.8.1/src/timer.rs:47:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | struct TimerCore {
[INFO] [stderr]    | - `src::timer::TimerCore` declared as private
[INFO] [stderr] ...
[INFO] [stderr] 47 |     type Raw = TimerCore;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^ can't leak private 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 E0446`.
[INFO] [stderr] error: Could not compile `mioco`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "55251d55cb9030ce3a0a84b86558f5d1f04f0f13e6fbc94ae5496fdc595483f7"`
[INFO] running `"docker" "rm" "-f" "55251d55cb9030ce3a0a84b86558f5d1f04f0f13e6fbc94ae5496fdc595483f7"`
[INFO] [stdout] 55251d55cb9030ce3a0a84b86558f5d1f04f0f13e6fbc94ae5496fdc595483f7