[INFO] updating cached repository neosmart/pkg-graph
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/neosmart/pkg-graph
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/neosmart/pkg-graph" "work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/neosmart/pkg-graph" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosmart/pkg-graph"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosmart/pkg-graph'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3b1689806266a18766f7107fd41252cd1ad57e70
[INFO] sha for GitHub repo neosmart/pkg-graph: 3b1689806266a18766f7107fd41252cd1ad57e70
[INFO] validating manifest of neosmart/pkg-graph 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 neosmart/pkg-graph 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 neosmart/pkg-graph
[INFO] finished frobbing neosmart/pkg-graph
[INFO] frobbed toml for neosmart/pkg-graph written to work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph/Cargo.toml
[INFO] started frobbing neosmart/pkg-graph
[INFO] finished frobbing neosmart/pkg-graph
[INFO] frobbed toml for neosmart/pkg-graph written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/neosmart/pkg-graph/Cargo.toml
[INFO] crate neosmart/pkg-graph 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 neosmart/pkg-graph 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph:/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] 4f4102bca50e5e62b9308a55cdb0a408cf3351bd71cc5a0b5ff7d3a8fd293492
[INFO] running `"docker" "start" "-a" "4f4102bca50e5e62b9308a55cdb0a408cf3351bd71cc5a0b5ff7d3a8fd293492"`
[INFO] [stderr]    Compiling serde_json v1.0.20
[INFO] [stderr]    Compiling pkg-graph v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:29
[INFO] [stderr]    |
[INFO] [stderr] 72 |                         let mut v = entry.get_mut().as_mut().unwrap();
[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 4.49s
[INFO] running `"docker" "inspect" "4f4102bca50e5e62b9308a55cdb0a408cf3351bd71cc5a0b5ff7d3a8fd293492"`
[INFO] running `"docker" "rm" "-f" "4f4102bca50e5e62b9308a55cdb0a408cf3351bd71cc5a0b5ff7d3a8fd293492"`
[INFO] [stdout] 4f4102bca50e5e62b9308a55cdb0a408cf3351bd71cc5a0b5ff7d3a8fd293492
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph:/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] bd20824cfcb646baa41f0056b69e2c5757c5038e3f584f47c8a416253ba9ca6d
[INFO] running `"docker" "start" "-a" "bd20824cfcb646baa41f0056b69e2c5757c5038e3f584f47c8a416253ba9ca6d"`
[INFO] [stderr]    Compiling pkg-graph v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:29
[INFO] [stderr]    |
[INFO] [stderr] 72 |                         let mut v = entry.get_mut().as_mut().unwrap();
[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 0.59s
[INFO] running `"docker" "inspect" "bd20824cfcb646baa41f0056b69e2c5757c5038e3f584f47c8a416253ba9ca6d"`
[INFO] running `"docker" "rm" "-f" "bd20824cfcb646baa41f0056b69e2c5757c5038e3f584f47c8a416253ba9ca6d"`
[INFO] [stdout] bd20824cfcb646baa41f0056b69e2c5757c5038e3f584f47c8a416253ba9ca6d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/neosmart/pkg-graph:/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] 4c77dbf5d37edcb1a37ac0cbac91b8716770853f64f1482feff06bfd1f4b01ab
[INFO] running `"docker" "start" "-a" "4c77dbf5d37edcb1a37ac0cbac91b8716770853f64f1482feff06bfd1f4b01ab"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/pkg_graph-b7cd92908a3e0e01
[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" "4c77dbf5d37edcb1a37ac0cbac91b8716770853f64f1482feff06bfd1f4b01ab"`
[INFO] running `"docker" "rm" "-f" "4c77dbf5d37edcb1a37ac0cbac91b8716770853f64f1482feff06bfd1f4b01ab"`
[INFO] [stdout] 4c77dbf5d37edcb1a37ac0cbac91b8716770853f64f1482feff06bfd1f4b01ab