[INFO] updating cached repository koalatux/riscv-rust-mfrc522
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/koalatux/riscv-rust-mfrc522
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/koalatux/riscv-rust-mfrc522" "work/ex/beta-1.38-1/sources/1.37.0/gh/koalatux/riscv-rust-mfrc522"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/koalatux/riscv-rust-mfrc522'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/koalatux/riscv-rust-mfrc522" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/koalatux/riscv-rust-mfrc522"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/koalatux/riscv-rust-mfrc522'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 56b6b7e17956a73a13ad494f48c13ad9a4140c6e
[INFO] sha for GitHub repo koalatux/riscv-rust-mfrc522: 56b6b7e17956a73a13ad494f48c13ad9a4140c6e
[INFO] validating manifest of koalatux/riscv-rust-mfrc522 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 koalatux/riscv-rust-mfrc522 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 koalatux/riscv-rust-mfrc522
[INFO] finished frobbing koalatux/riscv-rust-mfrc522
[INFO] frobbed toml for koalatux/riscv-rust-mfrc522 written to work/ex/beta-1.38-1/sources/1.37.0/gh/koalatux/riscv-rust-mfrc522/Cargo.toml
[INFO] started frobbing koalatux/riscv-rust-mfrc522
[INFO] finished frobbing koalatux/riscv-rust-mfrc522
[INFO] frobbed toml for koalatux/riscv-rust-mfrc522 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/koalatux/riscv-rust-mfrc522/Cargo.toml
[INFO] crate koalatux/riscv-rust-mfrc522 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 koalatux/riscv-rust-mfrc522 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-5/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/koalatux/riscv-rust-mfrc522:/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] 325408e3692e18d854c3b552f017fb234c3edbd4a06ffca2031e4e275fe94035
[INFO] running `"docker" "start" "-a" "325408e3692e18d854c3b552f017fb234c3edbd4a06ffca2031e4e275fe94035"`
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling proc-macro2 v0.4.27
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling rand_core v0.4.0
[INFO] [stderr]    Compiling riscv v0.5.2
[INFO] [stderr]    Compiling riscv-rt v0.5.0
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr] error[E0463]: can't find crate for `core`
[INFO] [stderr]   |
[INFO] [stderr]   = note: the `riscv32imac-unknown-none-elf` target may not be installed
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `bit_field`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "325408e3692e18d854c3b552f017fb234c3edbd4a06ffca2031e4e275fe94035"`
[INFO] running `"docker" "rm" "-f" "325408e3692e18d854c3b552f017fb234c3edbd4a06ffca2031e4e275fe94035"`
[INFO] [stdout] 325408e3692e18d854c3b552f017fb234c3edbd4a06ffca2031e4e275fe94035