[INFO] updating cached repository FredericHeem/rust-by-example
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/FredericHeem/rust-by-example
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/FredericHeem/rust-by-example" "work/ex/beta-1.38-1/sources/1.37.0/gh/FredericHeem/rust-by-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/FredericHeem/rust-by-example'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/FredericHeem/rust-by-example" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FredericHeem/rust-by-example"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FredericHeem/rust-by-example'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5ba1425ab145779f67b9ef2474e867945577c80b
[INFO] sha for GitHub repo FredericHeem/rust-by-example: 5ba1425ab145779f67b9ef2474e867945577c80b
[INFO] validating manifest of FredericHeem/rust-by-example 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 FredericHeem/rust-by-example 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 FredericHeem/rust-by-example
[INFO] finished frobbing FredericHeem/rust-by-example
[INFO] frobbed toml for FredericHeem/rust-by-example written to work/ex/beta-1.38-1/sources/1.37.0/gh/FredericHeem/rust-by-example/Cargo.toml
[INFO] started frobbing FredericHeem/rust-by-example
[INFO] finished frobbing FredericHeem/rust-by-example
[INFO] frobbed toml for FredericHeem/rust-by-example written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/FredericHeem/rust-by-example/Cargo.toml
[INFO] crate FredericHeem/rust-by-example 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 FredericHeem/rust-by-example 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-6/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/FredericHeem/rust-by-example:/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] 46d8b53849a1d78fd5f4d5fe7d03ca4224369f11f228d9c726d0cebfa2c8ab34
[INFO] running `"docker" "start" "-a" "46d8b53849a1d78fd5f4d5fe7d03ca4224369f11f228d9c726d0cebfa2c8ab34"`
[INFO] [stderr]    Compiling num-traits v0.1.37
[INFO] [stderr]    Compiling rayon-core v1.0.2
[INFO] [stderr]    Compiling libc v0.2.23
[INFO] [stderr]    Compiling deque v0.3.2
[INFO] [stderr]    Compiling rand v0.3.15
[INFO] [stderr]    Compiling num_cpus v1.5.0
[INFO] [stderr]    Compiling time v0.1.37
[INFO] [stderr]    Compiling num-integer v0.1.34
[INFO] [stderr]    Compiling num-iter v0.1.33
[INFO] [stderr]    Compiling num v0.1.37
[INFO] [stderr]    Compiling chrono v0.2.25
[INFO] [stderr]    Compiling rayon v0.7.1
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `root`
[INFO] [stderr]   --> src/tree.rs:58:18
[INFO] [stderr]    |
[INFO] [stderr] 58 |             Some(root) => println!("has root"),
[INFO] [stderr]    |                  ^^^^ help: consider prefixing with an underscore: `_root`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `key_pair` as mutable, as it is a captured variable in a `Fn` closure
[INFO] [stderr]   --> src/parallel.rs:16:59
[INFO] [stderr]    |
[INFO] [stderr] 16 |     passwords.par_iter().find_any(|&&x| check_password(x, &mut key_pair));
[INFO] [stderr]    |                                                           ^^^^^^^^^^^^^ cannot borrow as mutable
[INFO] [stderr]    |
[INFO] [stderr] help: consider changing this to accept closures that implement `FnMut`
[INFO] [stderr]   --> src/parallel.rs:16:35
[INFO] [stderr]    |
[INFO] [stderr] 16 |     passwords.par_iter().find_any(|&&x| check_password(x, &mut key_pair));
[INFO] [stderr]    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] error: Could not compile `rust-by-example`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "46d8b53849a1d78fd5f4d5fe7d03ca4224369f11f228d9c726d0cebfa2c8ab34"`
[INFO] running `"docker" "rm" "-f" "46d8b53849a1d78fd5f4d5fe7d03ca4224369f11f228d9c726d0cebfa2c8ab34"`
[INFO] [stdout] 46d8b53849a1d78fd5f4d5fe7d03ca4224369f11f228d9c726d0cebfa2c8ab34