[INFO] updating cached repository llwwns/maze
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/llwwns/maze
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/llwwns/maze" "work/ex/beta-1.38-1/sources/1.37.0/gh/llwwns/maze"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/llwwns/maze'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/llwwns/maze" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/llwwns/maze"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/llwwns/maze'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e0d4be9eaf889f5faa0386b992f297f90f8456ff
[INFO] sha for GitHub repo llwwns/maze: e0d4be9eaf889f5faa0386b992f297f90f8456ff
[INFO] validating manifest of llwwns/maze 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 llwwns/maze 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 llwwns/maze
[INFO] removed path dependency union-find from llwwns/maze
[INFO] finished frobbing llwwns/maze
[INFO] frobbed toml for llwwns/maze written to work/ex/beta-1.38-1/sources/1.37.0/gh/llwwns/maze/Cargo.toml
[INFO] started frobbing llwwns/maze
[INFO] removed path dependency union-find from llwwns/maze
[INFO] finished frobbing llwwns/maze
[INFO] frobbed toml for llwwns/maze written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/llwwns/maze/Cargo.toml
[INFO] crate llwwns/maze 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]     Updating crates.io index
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/llwwns/maze/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 llwwns/maze 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/llwwns/maze:/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] 2c6749f5bd4ee84c81143d3f4dd88376f1a7082ba88008a0e453d4c67c4a5dab
[INFO] running `"docker" "start" "-a" "2c6749f5bd4ee84c81143d3f4dd88376f1a7082ba88008a0e453d4c67c4a5dab"`
[INFO] [stderr] warning: dependency (union-find) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr]    Compiling autocfg v0.1.5
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling bitvec v0.11.3
[INFO] [stderr]    Compiling union-find v0.3.2
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_xoshiro v0.1.0
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling maze v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0282]: type annotations needed
[INFO] [stderr]   --> src/main.rs:38:8
[INFO] [stderr]    |
[INFO] [stderr] 23 |   let mut uf = UnionFind::new(csize * csize);
[INFO] [stderr]    |       ------ consider giving `uf` a type
[INFO] [stderr] ...
[INFO] [stderr] 38 |     if uf.is_same(a, b) {
[INFO] [stderr]    |        ^^ cannot infer type
[INFO] [stderr]    |
[INFO] [stderr]    = note: type must be known at this point
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0282`.
[INFO] [stderr] error: Could not compile `maze`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "2c6749f5bd4ee84c81143d3f4dd88376f1a7082ba88008a0e453d4c67c4a5dab"`
[INFO] running `"docker" "rm" "-f" "2c6749f5bd4ee84c81143d3f4dd88376f1a7082ba88008a0e453d4c67c4a5dab"`
[INFO] [stdout] 2c6749f5bd4ee84c81143d3f4dd88376f1a7082ba88008a0e453d4c67c4a5dab