[INFO] updating cached repository tlrobrn/r-maze
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/tlrobrn/r-maze
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/tlrobrn/r-maze" "work/ex/beta-1.38-1/sources/1.37.0/gh/tlrobrn/r-maze"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/tlrobrn/r-maze'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/tlrobrn/r-maze" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tlrobrn/r-maze"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tlrobrn/r-maze'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cff6682df762a4a2143edf0db19359674579793a
[INFO] sha for GitHub repo tlrobrn/r-maze: cff6682df762a4a2143edf0db19359674579793a
[INFO] validating manifest of tlrobrn/r-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 tlrobrn/r-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 tlrobrn/r-maze
[INFO] finished frobbing tlrobrn/r-maze
[INFO] frobbed toml for tlrobrn/r-maze written to work/ex/beta-1.38-1/sources/1.37.0/gh/tlrobrn/r-maze/Cargo.toml
[INFO] started frobbing tlrobrn/r-maze
[INFO] finished frobbing tlrobrn/r-maze
[INFO] frobbed toml for tlrobrn/r-maze written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/tlrobrn/r-maze/Cargo.toml
[INFO] crate tlrobrn/r-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] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/tlrobrn/r-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[INFO] the lockfile is outdated, regenerating it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] [stderr]     Updating git repository `https://github.com/tlrobrn/r-dsets`
[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] [stderr]     Updating git repository `https://github.com/tlrobrn/r-dsets`
[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 tlrobrn/r-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-7/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/tlrobrn/r-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] 812f580e693792f53231feacec683f01b871190a00f6160781c35258b8170bdb
[INFO] running `"docker" "start" "-a" "812f580e693792f53231feacec683f01b871190a00f6160781c35258b8170bdb"`
[INFO] [stderr] warning: dependency (rand) specified without providing a local path, Git repository, or version to use. This will be considered an error in future versions
[INFO] [stderr] warning: unused manifest key: dependencies.rand.rand
[INFO] [stderr]    Compiling libc v0.2.62
[INFO] [stderr]    Compiling disjoint_sets v0.0.2 (https://github.com/tlrobrn/r-dsets#b3db4ace)
[INFO] [stderr]    Compiling getrandom v0.1.10
[INFO] [stderr]    Compiling rand_core v0.5.0
[INFO] [stderr]    Compiling rand_chacha v0.2.1
[INFO] [stderr]    Compiling rand v0.7.0
[INFO] [stderr]    Compiling r-maze v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/maze.rs:4:30
[INFO] [stderr]   |
[INFO] [stderr] 4 | use self::rand::{thread_rng, Rng};
[INFO] [stderr]   |                              ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `shuffle` found for type `maze::rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/maze.rs:59:13
[INFO] [stderr]    |
[INFO] [stderr] 59 |         rng.shuffle(&mut east);
[INFO] [stderr]    |             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `shuffle` found for type `maze::rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/maze.rs:60:13
[INFO] [stderr]    |
[INFO] [stderr] 60 |         rng.shuffle(&mut south);
[INFO] [stderr]    |             ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0599`.
[INFO] [stderr] error: Could not compile `r-maze`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "812f580e693792f53231feacec683f01b871190a00f6160781c35258b8170bdb"`
[INFO] running `"docker" "rm" "-f" "812f580e693792f53231feacec683f01b871190a00f6160781c35258b8170bdb"`
[INFO] [stdout] 812f580e693792f53231feacec683f01b871190a00f6160781c35258b8170bdb