[INFO] crate pleco_engine 0.1.6 is already in cache
[INFO] extracting crate pleco_engine 0.1.6 into work/ex/beta-1.37-6/sources/1.36.0/reg/pleco_engine/0.1.6
[INFO] extracting crate pleco_engine 0.1.6 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/pleco_engine/0.1.6
[INFO] validating manifest of pleco_engine-0.1.6 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of pleco_engine-0.1.6 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing pleco_engine-0.1.6
[INFO] finished frobbing pleco_engine-0.1.6
[INFO] frobbed toml for pleco_engine-0.1.6 written to work/ex/beta-1.37-6/sources/1.36.0/reg/pleco_engine/0.1.6/Cargo.toml
[INFO] started frobbing pleco_engine-0.1.6
[INFO] finished frobbing pleco_engine-0.1.6
[INFO] frobbed toml for pleco_engine-0.1.6 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/pleco_engine/0.1.6/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "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" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing pleco_engine-0.1.6 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/pleco_engine/0.1.6:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] d3dcb404fca45a303a6859af21b53ed1fa856dfe1036e42e5120ad83c3d459ca
[INFO] running `"docker" "start" "-a" "d3dcb404fca45a303a6859af21b53ed1fa856dfe1036e42e5120ad83c3d459ca"`
[INFO] [stderr] error: failed to parse manifest at `/opt/crater/workdir/Cargo.toml`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   can't find `bench_engine_main` bench, specify bench.path
[INFO] running `"docker" "inspect" "d3dcb404fca45a303a6859af21b53ed1fa856dfe1036e42e5120ad83c3d459ca"`
[INFO] running `"docker" "rm" "-f" "d3dcb404fca45a303a6859af21b53ed1fa856dfe1036e42e5120ad83c3d459ca"`
[INFO] [stdout] d3dcb404fca45a303a6859af21b53ed1fa856dfe1036e42e5120ad83c3d459ca