[INFO] updating cached repository davidpeklak/cargo-stdx-check
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/davidpeklak/cargo-stdx-check
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/davidpeklak/cargo-stdx-check" "work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/davidpeklak/cargo-stdx-check" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davidpeklak/cargo-stdx-check"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davidpeklak/cargo-stdx-check'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6b0beb957152519476a52be3bba72611dc4064fa
[INFO] sha for GitHub repo davidpeklak/cargo-stdx-check: 6b0beb957152519476a52be3bba72611dc4064fa
[INFO] validating manifest of davidpeklak/cargo-stdx-check 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 davidpeklak/cargo-stdx-check 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 davidpeklak/cargo-stdx-check
[INFO] finished frobbing davidpeklak/cargo-stdx-check
[INFO] frobbed toml for davidpeklak/cargo-stdx-check written to work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check/Cargo.toml
[INFO] started frobbing davidpeklak/cargo-stdx-check
[INFO] finished frobbing davidpeklak/cargo-stdx-check
[INFO] frobbed toml for davidpeklak/cargo-stdx-check written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/davidpeklak/cargo-stdx-check/Cargo.toml
[INFO] crate davidpeklak/cargo-stdx-check 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 davidpeklak/cargo-stdx-check 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check:/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] 25059ebd7c576acba98138fe3645bb3b919a9bfea2f43ede3d542588ffb92bb7
[INFO] running `"docker" "start" "-a" "25059ebd7c576acba98138fe3645bb3b919a9bfea2f43ede3d542588ffb92bb7"`
[INFO] [stderr]    Compiling serde v1.0.8
[INFO] [stderr]    Compiling backtrace-sys v0.1.11
[INFO] [stderr]    Compiling serde_derive v1.0.8
[INFO] [stderr]    Compiling docopt v0.8.1
[INFO] [stderr]    Compiling toml v0.4.2
[INFO] [stderr]    Compiling backtrace v0.3.2
[INFO] [stderr]    Compiling error-chain v0.10.0
[INFO] [stderr]    Compiling cargo-stdx-check v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:186:13
[INFO] [stderr]     |
[INFO] [stderr] 186 |         let mut set = grouped.entry(name).or_insert(BTreeSet::new());
[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 37.63s
[INFO] running `"docker" "inspect" "25059ebd7c576acba98138fe3645bb3b919a9bfea2f43ede3d542588ffb92bb7"`
[INFO] running `"docker" "rm" "-f" "25059ebd7c576acba98138fe3645bb3b919a9bfea2f43ede3d542588ffb92bb7"`
[INFO] [stdout] 25059ebd7c576acba98138fe3645bb3b919a9bfea2f43ede3d542588ffb92bb7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check:/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] 7f7e8ba99bbf9e1724d129628fc4163da2d3c48184c32413fcdff8b0443e1135
[INFO] running `"docker" "start" "-a" "7f7e8ba99bbf9e1724d129628fc4163da2d3c48184c32413fcdff8b0443e1135"`
[INFO] [stderr]    Compiling cargo-stdx-check v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:186:13
[INFO] [stderr]     |
[INFO] [stderr] 186 |         let mut set = grouped.entry(name).or_insert(BTreeSet::new());
[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 0.81s
[INFO] running `"docker" "inspect" "7f7e8ba99bbf9e1724d129628fc4163da2d3c48184c32413fcdff8b0443e1135"`
[INFO] running `"docker" "rm" "-f" "7f7e8ba99bbf9e1724d129628fc4163da2d3c48184c32413fcdff8b0443e1135"`
[INFO] [stdout] 7f7e8ba99bbf9e1724d129628fc4163da2d3c48184c32413fcdff8b0443e1135
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/davidpeklak/cargo-stdx-check:/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] 4063583a13d7596fde9535f21123e17059b4da5f8cdbdaf40fb4e5ffcee9638d
[INFO] running `"docker" "start" "-a" "4063583a13d7596fde9535f21123e17059b4da5f8cdbdaf40fb4e5ffcee9638d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/cargo_stdx_check-aadc06f956688995
[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" "4063583a13d7596fde9535f21123e17059b4da5f8cdbdaf40fb4e5ffcee9638d"`
[INFO] running `"docker" "rm" "-f" "4063583a13d7596fde9535f21123e17059b4da5f8cdbdaf40fb4e5ffcee9638d"`
[INFO] [stdout] 4063583a13d7596fde9535f21123e17059b4da5f8cdbdaf40fb4e5ffcee9638d