[INFO] updating cached repository https://github.com/gcharnock/crypto-challenges-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 09b595df5d2d2e6de0c62325cc5b68896758de8f
[INFO] testing gcharnock/crypto-challenges-rust against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgcharnock%2Fcrypto-challenges-rust" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gcharnock/crypto-challenges-rust on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/gcharnock/crypto-challenges-rust
[INFO] finished tweaking git repo https://github.com/gcharnock/crypto-challenges-rust
[INFO] tweaked toml for git repo https://github.com/gcharnock/crypto-challenges-rust written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/gcharnock/crypto-challenges-rust already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] error: the lock file /big/crater/work/builds/worker-1/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 263c45e55ee9270b97cc87273f8f6270fd14ca599c0c3895f2665b97269066bc
[INFO] running `"docker" "start" "-a" "263c45e55ee9270b97cc87273f8f6270fd14ca599c0c3895f2665b97269066bc"`
[INFO] [stderr]    Compiling crypto-challenges v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0601]: `main` function not found in crate `crypto_challenges`
[INFO] [stderr]    --> src/main.rs:1:1
[INFO] [stderr]     |
[INFO] [stderr] 1   | / extern crate rustc_serialize;
[INFO] [stderr] 2   | |
[INFO] [stderr] 3   | | use rustc_serialize::hex::ToHex;
[INFO] [stderr] 4   | | use rustc_serialize::base64::ToBase64;
[INFO] [stderr] ...   |
[INFO] [stderr] 317 | |     }
[INFO] [stderr] 318 | | }
[INFO] [stderr]     | |_^ 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 `crypto-challenges`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "263c45e55ee9270b97cc87273f8f6270fd14ca599c0c3895f2665b97269066bc"`
[INFO] running `"docker" "rm" "-f" "263c45e55ee9270b97cc87273f8f6270fd14ca599c0c3895f2665b97269066bc"`
[INFO] [stdout] 263c45e55ee9270b97cc87273f8f6270fd14ca599c0c3895f2665b97269066bc