[INFO] updating cached repository courajs/urbit-1
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/courajs/urbit-1
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/courajs/urbit-1" "work/ex/beta-1.38-1/sources/1.37.0/gh/courajs/urbit-1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/courajs/urbit-1'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/courajs/urbit-1" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/courajs/urbit-1"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/courajs/urbit-1'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1a2e28c004f7b3d54dbb1d030f01aaa03d13ef02
[INFO] sha for GitHub repo courajs/urbit-1: 1a2e28c004f7b3d54dbb1d030f01aaa03d13ef02
[INFO] validating manifest of courajs/urbit-1 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 courajs/urbit-1 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 courajs/urbit-1
[INFO] finished frobbing courajs/urbit-1
[INFO] frobbed toml for courajs/urbit-1 written to work/ex/beta-1.38-1/sources/1.37.0/gh/courajs/urbit-1/Cargo.toml
[INFO] started frobbing courajs/urbit-1
[INFO] finished frobbing courajs/urbit-1
[INFO] frobbed toml for courajs/urbit-1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/courajs/urbit-1/Cargo.toml
[INFO] crate courajs/urbit-1 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing courajs/urbit-1 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/courajs/urbit-1:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 34f37e0c6adff6d3786f98a221c12b985f672014f2eb4871d456d3f6bdca6a9b
[INFO] running `"docker" "start" "-a" "34f37e0c6adff6d3786f98a221c12b985f672014f2eb4871d456d3f6bdca6a9b"`
[INFO] [stderr]    Compiling urbit-1 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused macro definition
[INFO] [stderr]   --> src/main.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / macro_rules! noun {
[INFO] [stderr] 8  | |     ()                           => {};
[INFO] [stderr] 9  | |     ($it:literal)                => { Rc::new(Noun::Atom($it)) };
[INFO] [stderr] 10 | |     ($it:literal $($rest:tt)*)   => { Rc::new(Noun::Cell(noun!($it), noun!($($rest)*))) };
[INFO] [stderr] ...  |
[INFO] [stderr] 18 | |     ({$($sub:tt)*} $($rest:tt)*) => { noun!([$($sub)*] $($rest)*) };
[INFO] [stderr] 19 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_macros)] on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `urbit_1`
[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 `urbit-1`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "34f37e0c6adff6d3786f98a221c12b985f672014f2eb4871d456d3f6bdca6a9b"`
[INFO] running `"docker" "rm" "-f" "34f37e0c6adff6d3786f98a221c12b985f672014f2eb4871d456d3f6bdca6a9b"`
[INFO] [stdout] 34f37e0c6adff6d3786f98a221c12b985f672014f2eb4871d456d3f6bdca6a9b