[INFO] updating cached repository isurakka/rpn
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/isurakka/rpn
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/isurakka/rpn" "work/ex/beta-1.38-1/sources/1.37.0/gh/isurakka/rpn"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/isurakka/rpn'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/isurakka/rpn" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/isurakka/rpn"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/isurakka/rpn'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ae4a80b88809cb2ed0b2068e2c7ae756bceb5846
[INFO] sha for GitHub repo isurakka/rpn: ae4a80b88809cb2ed0b2068e2c7ae756bceb5846
[INFO] validating manifest of isurakka/rpn 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 isurakka/rpn 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 isurakka/rpn
[INFO] finished frobbing isurakka/rpn
[INFO] frobbed toml for isurakka/rpn written to work/ex/beta-1.38-1/sources/1.37.0/gh/isurakka/rpn/Cargo.toml
[INFO] started frobbing isurakka/rpn
[INFO] finished frobbing isurakka/rpn
[INFO] frobbed toml for isurakka/rpn written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/isurakka/rpn/Cargo.toml
[INFO] crate isurakka/rpn 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 isurakka/rpn 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-0/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/isurakka/rpn:/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] 205f9b092629002bd2a5442545570770db0746618f5440fec52eca4b3cbdd3ae
[INFO] running `"docker" "start" "-a" "205f9b092629002bd2a5442545570770db0746618f5440fec52eca4b3cbdd3ae"`
[INFO] [stderr]    Compiling rpn v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0601]: `main` function not found in crate `rpn`
[INFO] [stderr]   |
[INFO] [stderr]   = note: consider adding a `main` function to `src/main.rs`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: Could not compile `rpn`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "205f9b092629002bd2a5442545570770db0746618f5440fec52eca4b3cbdd3ae"`
[INFO] running `"docker" "rm" "-f" "205f9b092629002bd2a5442545570770db0746618f5440fec52eca4b3cbdd3ae"`
[INFO] [stdout] 205f9b092629002bd2a5442545570770db0746618f5440fec52eca4b3cbdd3ae