[INFO] updating cached repository withkittens/rust-classifier
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/withkittens/rust-classifier
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/withkittens/rust-classifier" "work/ex/beta-1.38-1/sources/1.37.0/gh/withkittens/rust-classifier"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/withkittens/rust-classifier'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/withkittens/rust-classifier" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/withkittens/rust-classifier"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/withkittens/rust-classifier'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c01a79838774360c6614c334b9c9856f39393297
[INFO] sha for GitHub repo withkittens/rust-classifier: c01a79838774360c6614c334b9c9856f39393297
[INFO] validating manifest of withkittens/rust-classifier 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 withkittens/rust-classifier 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 withkittens/rust-classifier
[INFO] finished frobbing withkittens/rust-classifier
[INFO] frobbed toml for withkittens/rust-classifier written to work/ex/beta-1.38-1/sources/1.37.0/gh/withkittens/rust-classifier/Cargo.toml
[INFO] started frobbing withkittens/rust-classifier
[INFO] finished frobbing withkittens/rust-classifier
[INFO] frobbed toml for withkittens/rust-classifier written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/withkittens/rust-classifier/Cargo.toml
[INFO] crate withkittens/rust-classifier 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/withkittens/rust-classifier/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[INFO] the lockfile is outdated, regenerating it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] 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 withkittens/rust-classifier 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-3/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/withkittens/rust-classifier:/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] 837e700b130882c0665b9aa405acab86f9a343ade7f11bb5d2e8f188a3dda964
[INFO] running `"docker" "start" "-a" "837e700b130882c0665b9aa405acab86f9a343ade7f11bb5d2e8f188a3dda964"`
[INFO] [stderr]    Compiling strtod v0.0.1
[INFO] [stderr]    Compiling clock_ticks v0.0.6
[INFO] [stderr]    Compiling classifier v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/classifier.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.36s
[INFO] running `"docker" "inspect" "837e700b130882c0665b9aa405acab86f9a343ade7f11bb5d2e8f188a3dda964"`
[INFO] running `"docker" "rm" "-f" "837e700b130882c0665b9aa405acab86f9a343ade7f11bb5d2e8f188a3dda964"`
[INFO] [stdout] 837e700b130882c0665b9aa405acab86f9a343ade7f11bb5d2e8f188a3dda964
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/withkittens/rust-classifier:/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" "test" "--frozen" "--no-run"`
[INFO] [stdout] 017f96216c7f2559dcebea6e562f155ed3a48bf5ee6d97f9c8f0f6c5b74c6b81
[INFO] running `"docker" "start" "-a" "017f96216c7f2559dcebea6e562f155ed3a48bf5ee6d97f9c8f0f6c5b74c6b81"`
[INFO] [stderr]    Compiling classifier v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::mem`
[INFO] [stderr]  --> src/classifier.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::mem;
[INFO] [stderr]   |     ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `"docker" "inspect" "017f96216c7f2559dcebea6e562f155ed3a48bf5ee6d97f9c8f0f6c5b74c6b81"`
[INFO] running `"docker" "rm" "-f" "017f96216c7f2559dcebea6e562f155ed3a48bf5ee6d97f9c8f0f6c5b74c6b81"`
[INFO] [stdout] 017f96216c7f2559dcebea6e562f155ed3a48bf5ee6d97f9c8f0f6c5b74c6b81
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/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/withkittens/rust-classifier:/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" "test" "--frozen"`
[INFO] [stdout] d51a9034707318d0673a422d3b426e16b3b257e352962313b0b19ffa279ba768
[INFO] running `"docker" "start" "-a" "d51a9034707318d0673a422d3b426e16b3b257e352962313b0b19ffa279ba768"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/classifier-0592859e96153f8d
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test class::class_append ... ok
[INFO] [stdout] test measure::measure_ops ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "d51a9034707318d0673a422d3b426e16b3b257e352962313b0b19ffa279ba768"`
[INFO] running `"docker" "rm" "-f" "d51a9034707318d0673a422d3b426e16b3b257e352962313b0b19ffa279ba768"`
[INFO] [stdout] d51a9034707318d0673a422d3b426e16b3b257e352962313b0b19ffa279ba768