[INFO] updating cached repository lilydjwg/pid_children
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lilydjwg/pid_children
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lilydjwg/pid_children" "work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lilydjwg/pid_children" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lilydjwg/pid_children"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lilydjwg/pid_children'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a0b9f138fa0c4eb77566afc763c114153cb5c1a9
[INFO] sha for GitHub repo lilydjwg/pid_children: a0b9f138fa0c4eb77566afc763c114153cb5c1a9
[INFO] validating manifest of lilydjwg/pid_children on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lilydjwg/pid_children on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lilydjwg/pid_children
[INFO] finished frobbing lilydjwg/pid_children
[INFO] frobbed toml for lilydjwg/pid_children written to work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children/Cargo.toml
[INFO] started frobbing lilydjwg/pid_children
[INFO] finished frobbing lilydjwg/pid_children
[INFO] frobbed toml for lilydjwg/pid_children written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/lilydjwg/pid_children/Cargo.toml
[INFO] crate lilydjwg/pid_children already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing lilydjwg/pid_children against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] e7b2dcd6498b3010a288041366431cf982722e8729314749f2138838760156ba
[INFO] running `"docker" "start" "-a" "e7b2dcd6498b3010a288041366431cf982722e8729314749f2138838760156ba"`
[INFO] [stderr]    Compiling pid_children v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:12:21
[INFO] [stderr]    |
[INFO] [stderr] 12 |                 let mut children = children_map.entry(ppid).or_insert_with(Vec::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 1.56s
[INFO] running `"docker" "inspect" "e7b2dcd6498b3010a288041366431cf982722e8729314749f2138838760156ba"`
[INFO] running `"docker" "rm" "-f" "e7b2dcd6498b3010a288041366431cf982722e8729314749f2138838760156ba"`
[INFO] [stdout] e7b2dcd6498b3010a288041366431cf982722e8729314749f2138838760156ba
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] b4e5b5a2c8047f698c4f343eab3e6384b65c05dac3ea727239c08603991cd396
[INFO] running `"docker" "start" "-a" "b4e5b5a2c8047f698c4f343eab3e6384b65c05dac3ea727239c08603991cd396"`
[INFO] [stderr]    Compiling pid_children v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:12:21
[INFO] [stderr]    |
[INFO] [stderr] 12 |                 let mut children = children_map.entry(ppid).or_insert_with(Vec::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 0.71s
[INFO] running `"docker" "inspect" "b4e5b5a2c8047f698c4f343eab3e6384b65c05dac3ea727239c08603991cd396"`
[INFO] running `"docker" "rm" "-f" "b4e5b5a2c8047f698c4f343eab3e6384b65c05dac3ea727239c08603991cd396"`
[INFO] [stdout] b4e5b5a2c8047f698c4f343eab3e6384b65c05dac3ea727239c08603991cd396
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/lilydjwg/pid_children:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 1f827c6d472bb86ce8fc6b6614d149e9db7cf75d00dbcc9c4637b0dfa6690a4d
[INFO] running `"docker" "start" "-a" "1f827c6d472bb86ce8fc6b6614d149e9db7cf75d00dbcc9c4637b0dfa6690a4d"`
[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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/pid_children-11626f4d0382cca6
[INFO] running `"docker" "inspect" "1f827c6d472bb86ce8fc6b6614d149e9db7cf75d00dbcc9c4637b0dfa6690a4d"`
[INFO] running `"docker" "rm" "-f" "1f827c6d472bb86ce8fc6b6614d149e9db7cf75d00dbcc9c4637b0dfa6690a4d"`
[INFO] [stdout] 1f827c6d472bb86ce8fc6b6614d149e9db7cf75d00dbcc9c4637b0dfa6690a4d