[INFO] updating cached repository https://github.com/FredericHeem/rust-by-example
[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] 5ba1425ab145779f67b9ef2474e867945577c80b
[INFO] testing FredericHeem/rust-by-example against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FFredericHeem%2Frust-by-example" "work/builds/worker-8/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/FredericHeem/rust-by-example on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/FredericHeem/rust-by-example
[INFO] finished tweaking git repo https://github.com/FredericHeem/rust-by-example
[INFO] tweaked toml for git repo https://github.com/FredericHeem/rust-by-example written to work/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/FredericHeem/rust-by-example already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-8/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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] c831abcf2bb23481d600f8c53caf0263259982152f43197498d4f28eb7340e7b
[INFO] running `"docker" "start" "-a" "c831abcf2bb23481d600f8c53caf0263259982152f43197498d4f28eb7340e7b"`
[INFO] [stderr]    Compiling rayon-core v1.0.2
[INFO] [stderr]    Compiling chrono v0.2.25
[INFO] [stderr]    Compiling rayon v0.7.1
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/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" "c831abcf2bb23481d600f8c53caf0263259982152f43197498d4f28eb7340e7b"`
[INFO] running `"docker" "rm" "-f" "c831abcf2bb23481d600f8c53caf0263259982152f43197498d4f28eb7340e7b"`
[INFO] [stdout] c831abcf2bb23481d600f8c53caf0263259982152f43197498d4f28eb7340e7b