[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 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-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 255117396e2df839f2b31d8c6c47d106d4ab8a4e69406826528b1d30909a9b4d
[INFO] running `"docker" "start" "-a" "255117396e2df839f2b31d8c6c47d106d4ab8a4e69406826528b1d30909a9b4d"`
[INFO] [stderr]    Compiling cc v1.0.14
[INFO] [stderr]    Compiling atty v0.2.10
[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 backtrace v0.3.6
[INFO] [stderr]    Compiling failure v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.43
[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 42.27s
[INFO] running `"docker" "inspect" "255117396e2df839f2b31d8c6c47d106d4ab8a4e69406826528b1d30909a9b4d"`
[INFO] running `"docker" "rm" "-f" "255117396e2df839f2b31d8c6c47d106d4ab8a4e69406826528b1d30909a9b4d"`
[INFO] [stdout] 255117396e2df839f2b31d8c6c47d106d4ab8a4e69406826528b1d30909a9b4d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] c55dc7f4ca2b357a54eef5ba1638e4ffb1390efb4fba28b85b4e8d916488e7e3
[INFO] running `"docker" "start" "-a" "c55dc7f4ca2b357a54eef5ba1638e4ffb1390efb4fba28b85b4e8d916488e7e3"`
[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 1.12s
[INFO] running `"docker" "inspect" "c55dc7f4ca2b357a54eef5ba1638e4ffb1390efb4fba28b85b4e8d916488e7e3"`
[INFO] running `"docker" "rm" "-f" "c55dc7f4ca2b357a54eef5ba1638e4ffb1390efb4fba28b85b4e8d916488e7e3"`
[INFO] [stdout] c55dc7f4ca2b357a54eef5ba1638e4ffb1390efb4fba28b85b4e8d916488e7e3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 3bf1c0358ff054ca6024fe4704ca53d8c83e35e3389b26f9131be43b57631749
[INFO] running `"docker" "start" "-a" "3bf1c0358ff054ca6024fe4704ca53d8c83e35e3389b26f9131be43b57631749"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_import-a95a9d5f1432c98a
[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" "3bf1c0358ff054ca6024fe4704ca53d8c83e35e3389b26f9131be43b57631749"`
[INFO] running `"docker" "rm" "-f" "3bf1c0358ff054ca6024fe4704ca53d8c83e35e3389b26f9131be43b57631749"`
[INFO] [stdout] 3bf1c0358ff054ca6024fe4704ca53d8c83e35e3389b26f9131be43b57631749