[INFO] updating cached repository Steenaire/collectors_curve
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Steenaire/collectors_curve
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Steenaire/collectors_curve" "work/ex/beta-1.38-1/sources/1.37.0/gh/Steenaire/collectors_curve"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Steenaire/collectors_curve'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Steenaire/collectors_curve" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Steenaire/collectors_curve"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Steenaire/collectors_curve'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 75b3183a48deb302197da4dd356e125c3e97bd74
[INFO] sha for GitHub repo Steenaire/collectors_curve: 75b3183a48deb302197da4dd356e125c3e97bd74
[INFO] validating manifest of Steenaire/collectors_curve 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 Steenaire/collectors_curve 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 Steenaire/collectors_curve
[INFO] finished frobbing Steenaire/collectors_curve
[INFO] frobbed toml for Steenaire/collectors_curve written to work/ex/beta-1.38-1/sources/1.37.0/gh/Steenaire/collectors_curve/Cargo.toml
[INFO] started frobbing Steenaire/collectors_curve
[INFO] finished frobbing Steenaire/collectors_curve
[INFO] frobbed toml for Steenaire/collectors_curve written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Steenaire/collectors_curve/Cargo.toml
[INFO] crate Steenaire/collectors_curve 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/Steenaire/collectors_curve/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[INFO] the lockfile is outdated, regenerating it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]     Blocking waiting for file lock on package cache
[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 Steenaire/collectors_curve against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/Steenaire/collectors_curve:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 37813e3fa2e2b6ccfc12e3559bd07d0678fb0d310bae718d22a4f52d3cfe2c84
[INFO] running `"docker" "start" "-a" "37813e3fa2e2b6ccfc12e3559bd07d0678fb0d310bae718d22a4f52d3cfe2c84"`
[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 collectors_curve v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]  --> src/main.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand::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 `rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/main.rs:51:24
[INFO] [stderr]    |
[INFO] [stderr] 51 |     rand::thread_rng().shuffle(&mut data_vector);
[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 E0599`.
[INFO] [stderr] error: Could not compile `collectors_curve`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "37813e3fa2e2b6ccfc12e3559bd07d0678fb0d310bae718d22a4f52d3cfe2c84"`
[INFO] running `"docker" "rm" "-f" "37813e3fa2e2b6ccfc12e3559bd07d0678fb0d310bae718d22a4f52d3cfe2c84"`
[INFO] [stdout] 37813e3fa2e2b6ccfc12e3559bd07d0678fb0d310bae718d22a4f52d3cfe2c84