[INFO] updating cached repository jD91mZM2/rust-import
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jD91mZM2/rust-import
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jD91mZM2/rust-import" "work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/rust-import"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/rust-import'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jD91mZM2/rust-import" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/rust-import"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/rust-import'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c41881b5202691db94864e337f96a3dddbda98b7
[INFO] sha for GitHub repo jD91mZM2/rust-import: c41881b5202691db94864e337f96a3dddbda98b7
[INFO] validating manifest of jD91mZM2/rust-import 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 jD91mZM2/rust-import 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 jD91mZM2/rust-import
[INFO] finished frobbing jD91mZM2/rust-import
[INFO] frobbed toml for jD91mZM2/rust-import written to work/ex/beta-1.38-1/sources/1.37.0/gh/jD91mZM2/rust-import/Cargo.toml
[INFO] started frobbing jD91mZM2/rust-import
[INFO] finished frobbing jD91mZM2/rust-import
[INFO] frobbed toml for jD91mZM2/rust-import written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jD91mZM2/rust-import/Cargo.toml
[INFO] crate jD91mZM2/rust-import 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 jD91mZM2/rust-import 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-4/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/jD91mZM2/rust-import:/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] 37ccaf97bc63e55e6a32a08adb29cc339ac71bc8e872f8eeba7be59bd9d03fa8
[INFO] running `"docker" "start" "-a" "37ccaf97bc63e55e6a32a08adb29cc339ac71bc8e872f8eeba7be59bd9d03fa8"`
[INFO] [stderr]    Compiling cc v1.0.14
[INFO] [stderr]    Compiling serde v1.0.43
[INFO] [stderr]    Compiling bitflags v1.0.2
[INFO] [stderr]    Compiling syn v0.13.4
[INFO] [stderr]    Compiling clap v2.31.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.16
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling serde_json v1.0.16
[INFO] [stderr]    Compiling serde_derive v1.0.43
[INFO] [stderr]    Compiling backtrace v0.3.6
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling rust-import v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:277:29
[INFO] [stderr]     |
[INFO] [stderr] 277 |                         let mut list = &mut group.items;
[INFO] [stderr]     |                             ----^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 41.89s
[INFO] running `"docker" "inspect" "37ccaf97bc63e55e6a32a08adb29cc339ac71bc8e872f8eeba7be59bd9d03fa8"`
[INFO] running `"docker" "rm" "-f" "37ccaf97bc63e55e6a32a08adb29cc339ac71bc8e872f8eeba7be59bd9d03fa8"`
[INFO] [stdout] 37ccaf97bc63e55e6a32a08adb29cc339ac71bc8e872f8eeba7be59bd9d03fa8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/jD91mZM2/rust-import:/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] 01c94ec79564cc5b8604a360bd067e633f3531cabc9470fbd5bbb540ce032545
[INFO] running `"docker" "start" "-a" "01c94ec79564cc5b8604a360bd067e633f3531cabc9470fbd5bbb540ce032545"`
[INFO] [stderr]    Compiling rust-import v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:277:29
[INFO] [stderr]     |
[INFO] [stderr] 277 |                         let mut list = &mut group.items;
[INFO] [stderr]     |                             ----^^^^
[INFO] [stderr]     |                             |
[INFO] [stderr]     |                             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.07s
[INFO] running `"docker" "inspect" "01c94ec79564cc5b8604a360bd067e633f3531cabc9470fbd5bbb540ce032545"`
[INFO] running `"docker" "rm" "-f" "01c94ec79564cc5b8604a360bd067e633f3531cabc9470fbd5bbb540ce032545"`
[INFO] [stdout] 01c94ec79564cc5b8604a360bd067e633f3531cabc9470fbd5bbb540ce032545
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/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/jD91mZM2/rust-import:/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] b28d7bde3f0240bca945a03686aa13f7a2bf8ecd857c7b616b4162e974f9061d
[INFO] running `"docker" "start" "-a" "b28d7bde3f0240bca945a03686aa13f7a2bf8ecd857c7b616b4162e974f9061d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_import-1bae3e98fc3f08e9
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "b28d7bde3f0240bca945a03686aa13f7a2bf8ecd857c7b616b4162e974f9061d"`
[INFO] running `"docker" "rm" "-f" "b28d7bde3f0240bca945a03686aa13f7a2bf8ecd857c7b616b4162e974f9061d"`
[INFO] [stdout] b28d7bde3f0240bca945a03686aa13f7a2bf8ecd857c7b616b4162e974f9061d