[INFO] updating cached repository erik/mittens
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/erik/mittens
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/erik/mittens" "work/ex/beta-1.38-1/sources/1.37.0/gh/erik/mittens"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/erik/mittens'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/erik/mittens" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/erik/mittens"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/erik/mittens'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ed740a6fdb65d1a6d2c4455c4be8466ffc01ff58
[INFO] sha for GitHub repo erik/mittens: ed740a6fdb65d1a6d2c4455c4be8466ffc01ff58
[INFO] validating manifest of erik/mittens 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 erik/mittens 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 erik/mittens
[INFO] finished frobbing erik/mittens
[INFO] frobbed toml for erik/mittens written to work/ex/beta-1.38-1/sources/1.37.0/gh/erik/mittens/Cargo.toml
[INFO] started frobbing erik/mittens
[INFO] finished frobbing erik/mittens
[INFO] frobbed toml for erik/mittens written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/erik/mittens/Cargo.toml
[INFO] crate erik/mittens 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/erik/mittens/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[INFO] the lockfile is outdated, regenerating it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] [stderr]     Updating git repository `https://github.com/erik/knuckle`
[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]     Updating git repository `https://github.com/erik/knuckle`
[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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing erik/mittens 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-7/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/erik/mittens:/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] 9e9985f6df6fe9f9256ec4d6de2d5180e6454c6ad2672c445242bc793116258d
[INFO] running `"docker" "start" "-a" "9e9985f6df6fe9f9256ec4d6de2d5180e6454c6ad2672c445242bc793116258d"`
[INFO] [stderr]    Compiling knuckle v0.1.0 (https://github.com/erik/knuckle#9e625b94)
[INFO] [stderr] error: environment variable `OUT_DIR` not defined
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/knuckle-e59566995562bfcf/9e625b9/build.rs:5:19
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let out_dir = env!("OUT_DIR");
[INFO] [stderr]   |                   ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `knuckle`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "9e9985f6df6fe9f9256ec4d6de2d5180e6454c6ad2672c445242bc793116258d"`
[INFO] running `"docker" "rm" "-f" "9e9985f6df6fe9f9256ec4d6de2d5180e6454c6ad2672c445242bc793116258d"`
[INFO] [stdout] 9e9985f6df6fe9f9256ec4d6de2d5180e6454c6ad2672c445242bc793116258d