[INFO] updating cached repository k-masatany/rusternel
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/k-masatany/rusternel
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/k-masatany/rusternel" "work/ex/beta-1.38-1/sources/1.37.0/gh/k-masatany/rusternel"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/k-masatany/rusternel'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/k-masatany/rusternel" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-masatany/rusternel"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-masatany/rusternel'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a333caf68477414af542e28e58849782a5853d72
[INFO] sha for GitHub repo k-masatany/rusternel: a333caf68477414af542e28e58849782a5853d72
[INFO] validating manifest of k-masatany/rusternel 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 k-masatany/rusternel 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 k-masatany/rusternel
[INFO] finished frobbing k-masatany/rusternel
[INFO] frobbed toml for k-masatany/rusternel written to work/ex/beta-1.38-1/sources/1.37.0/gh/k-masatany/rusternel/Cargo.toml
[INFO] started frobbing k-masatany/rusternel
[INFO] finished frobbing k-masatany/rusternel
[INFO] frobbed toml for k-masatany/rusternel written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/k-masatany/rusternel/Cargo.toml
[INFO] crate k-masatany/rusternel 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing k-masatany/rusternel 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/gh/k-masatany/rusternel:/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] 470c62cb8f300eabe0eed086e4e082b958784daa9c536734be9d5c97e23af4ce
[INFO] running `"docker" "start" "-a" "470c62cb8f300eabe0eed086e4e082b958784daa9c536734be9d5c97e23af4ce"`
[INFO] [stderr]    Compiling rusternel v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error: couldn't read build.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rusternel`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "470c62cb8f300eabe0eed086e4e082b958784daa9c536734be9d5c97e23af4ce"`
[INFO] running `"docker" "rm" "-f" "470c62cb8f300eabe0eed086e4e082b958784daa9c536734be9d5c97e23af4ce"`
[INFO] [stdout] 470c62cb8f300eabe0eed086e4e082b958784daa9c536734be9d5c97e23af4ce