[INFO] crate usbd-serial 0.1.0 is already in cache
[INFO] extracting crate usbd-serial 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/usbd-serial/0.1.0
[INFO] extracting crate usbd-serial 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/usbd-serial/0.1.0
[INFO] validating manifest of usbd-serial-0.1.0 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 usbd-serial-0.1.0 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 usbd-serial-0.1.0
[INFO] finished frobbing usbd-serial-0.1.0
[INFO] frobbed toml for usbd-serial-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/usbd-serial/0.1.0/Cargo.toml
[INFO] started frobbing usbd-serial-0.1.0
[INFO] finished frobbing usbd-serial-0.1.0
[INFO] frobbed toml for usbd-serial-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/usbd-serial/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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 usbd-serial-0.1.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/usbd-serial/0.1.0:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 1fdfa822c3eb47e346ead4d6236e3d3b35335a5aee6cb5d34d54aadf647d7cfd
[INFO] running `"docker" "start" "-a" "1fdfa822c3eb47e346ead4d6236e3d3b35335a5aee6cb5d34d54aadf647d7cfd"`
[INFO] [stderr]    Compiling nb v0.1.2
[INFO] [stderr]    Compiling usb-device v0.2.2
[INFO] [stderr]    Compiling embedded-hal v0.2.3
[INFO] [stderr]    Compiling usbd-serial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.97s
[INFO] running `"docker" "inspect" "1fdfa822c3eb47e346ead4d6236e3d3b35335a5aee6cb5d34d54aadf647d7cfd"`
[INFO] running `"docker" "rm" "-f" "1fdfa822c3eb47e346ead4d6236e3d3b35335a5aee6cb5d34d54aadf647d7cfd"`
[INFO] [stdout] 1fdfa822c3eb47e346ead4d6236e3d3b35335a5aee6cb5d34d54aadf647d7cfd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/usbd-serial/0.1.0:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 6d95626ae3c124deab21f59c0179f9a2e9c28beb6117d75a49f5a0fb67cf5dd5
[INFO] running `"docker" "start" "-a" "6d95626ae3c124deab21f59c0179f9a2e9c28beb6117d75a49f5a0fb67cf5dd5"`
[INFO] [stderr]    Compiling usbd-serial v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `generic_array`
[INFO] [stderr]    --> src/buffer.rs:141:38
[INFO] [stderr]     |
[INFO] [stderr] 141 |     type Buf = crate::buffer::Buffer<generic_array::typenum::consts::U5>;
[INFO] [stderr]     |                                      ^^^^^^^^^^^^^ use of undeclared type or module `generic_array`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `usbd-serial`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "6d95626ae3c124deab21f59c0179f9a2e9c28beb6117d75a49f5a0fb67cf5dd5"`
[INFO] running `"docker" "rm" "-f" "6d95626ae3c124deab21f59c0179f9a2e9c28beb6117d75a49f5a0fb67cf5dd5"`
[INFO] [stdout] 6d95626ae3c124deab21f59c0179f9a2e9c28beb6117d75a49f5a0fb67cf5dd5