[INFO] updating cached repository yangbin/qumulus
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/yangbin/qumulus
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/yangbin/qumulus" "work/ex/beta-1.38-1/sources/1.37.0/gh/yangbin/qumulus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/yangbin/qumulus'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/yangbin/qumulus" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yangbin/qumulus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yangbin/qumulus'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3f004d57f50cd8d339b460093982efbd86e1e97b
[INFO] sha for GitHub repo yangbin/qumulus: 3f004d57f50cd8d339b460093982efbd86e1e97b
[INFO] validating manifest of yangbin/qumulus 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 yangbin/qumulus 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 yangbin/qumulus
[INFO] finished frobbing yangbin/qumulus
[INFO] frobbed toml for yangbin/qumulus written to work/ex/beta-1.38-1/sources/1.37.0/gh/yangbin/qumulus/Cargo.toml
[INFO] started frobbing yangbin/qumulus
[INFO] finished frobbing yangbin/qumulus
[INFO] frobbed toml for yangbin/qumulus written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/yangbin/qumulus/Cargo.toml
[INFO] crate yangbin/qumulus 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]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing yangbin/qumulus 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/yangbin/qumulus:/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] a91e7e276ceb62750e10241c0e68dc3f6428975c913d52a6ec749d71b2890912
[INFO] running `"docker" "start" "-a" "a91e7e276ceb62750e10241c0e68dc3f6428975c913d52a6ec749d71b2890912"`
[INFO] [stderr]    Compiling libc v0.2.31
[INFO] [stderr]    Compiling slab v0.1.3
[INFO] [stderr]    Compiling serde v1.0.15
[INFO] [stderr]    Compiling owning_ref v0.2.4
[INFO] [stderr]    Compiling slab v0.2.0
[INFO] [stderr]    Compiling thread-scoped v1.0.2
[INFO] [stderr]    Compiling spin v0.4.6
[INFO] [stderr]    Compiling ws2_32-sys v0.2.1
[INFO] [stderr]    Compiling context v1.0.1
[INFO] [stderr]    Compiling serde_derive_internals v0.16.0
[INFO] [stderr]    Compiling net2 v0.2.31
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling time v0.1.38
[INFO] [stderr]    Compiling nix v0.5.1
[INFO] [stderr]    Compiling num_cpus v1.6.2
[INFO] [stderr]    Compiling nix v0.6.0
[INFO] [stderr]    Compiling rand v0.3.16
[INFO] [stderr]    Compiling aho-corasick v0.6.3
[INFO] [stderr]    Compiling miow v0.1.5
[INFO] [stderr]    Compiling threadpool v1.7.0
[INFO] [stderr]    Compiling regex v0.2.2
[INFO] [stderr]    Compiling serde_derive v1.0.15
[INFO] [stderr]    Compiling mio v0.5.1
[INFO] [stderr]    Compiling mioco v0.8.1 (https://github.com/dpc/mioco.pre-0.9.git#f6705de1)
[INFO] [stderr]    Compiling env_logger v0.4.3
[INFO] [stderr] error[E0446]: private type `src::sync::mpsc::ReceiverCore<T>` in public interface
[INFO] [stderr]   --> /opt/crater/cargo-home/git/checkouts/mioco.pre-0.9-c53d3468b1c5ae28/f6705de/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/git/checkouts/mioco.pre-0.9-c53d3468b1c5ae28/f6705de/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] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a91e7e276ceb62750e10241c0e68dc3f6428975c913d52a6ec749d71b2890912"`
[INFO] running `"docker" "rm" "-f" "a91e7e276ceb62750e10241c0e68dc3f6428975c913d52a6ec749d71b2890912"`
[INFO] [stdout] a91e7e276ceb62750e10241c0e68dc3f6428975c913d52a6ec749d71b2890912