[INFO] updating cached repository https://github.com/tsurai/data-mining-rs
[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] 8550eab35b1abc27d3a5741a287d5af4bed4b5f6
[INFO] testing tsurai/data-mining-rs against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftsurai%2Fdata-mining-rs" "work/builds/worker-4/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tsurai/data-mining-rs 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/tsurai/data-mining-rs
[INFO] finished tweaking git repo https://github.com/tsurai/data-mining-rs
[INFO] tweaked toml for git repo https://github.com/tsurai/data-mining-rs written to work/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/tsurai/data-mining-rs 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] [stderr] error: the lock file /big/crater/work/builds/worker-4/source/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-4/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-4/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] 00091d525dc66f929aa972446c90d21518b47e8b1caa286d966ae0c41fd40cb0
[INFO] running `"docker" "start" "-a" "00091d525dc66f929aa972446c90d21518b47e8b1caa286d966ae0c41fd40cb0"`
[INFO] [stderr]    Compiling datamining_rs v0.0.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/kmeans.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |                        ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Rng`
[INFO] [stderr]  --> src/kmedoids.rs:2:24
[INFO] [stderr]   |
[INFO] [stderr] 2 | use rand::{thread_rng, Rng};
[INFO] [stderr]   |                        ^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `shuffle` found for type `rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]  --> src/kmeans.rs:9:15
[INFO] [stderr]   |
[INFO] [stderr] 9 |     thread_rng().shuffle(&mut indices[..]);
[INFO] [stderr]   |                  ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `shuffle` found for type `rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]  --> src/kmedoids.rs:9:15
[INFO] [stderr]   |
[INFO] [stderr] 9 |     thread_rng().shuffle(&mut indices[..]);
[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 `datamining_rs`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "00091d525dc66f929aa972446c90d21518b47e8b1caa286d966ae0c41fd40cb0"`
[INFO] running `"docker" "rm" "-f" "00091d525dc66f929aa972446c90d21518b47e8b1caa286d966ae0c41fd40cb0"`
[INFO] [stdout] 00091d525dc66f929aa972446c90d21518b47e8b1caa286d966ae0c41fd40cb0