[INFO] updating cached repository MindFlavor/bpb
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MindFlavor/bpb
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MindFlavor/bpb" "work/ex/beta-1.38-1/sources/1.37.0/gh/MindFlavor/bpb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/MindFlavor/bpb'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MindFlavor/bpb" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MindFlavor/bpb"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MindFlavor/bpb'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3b384ae9b753379332855654a28f4091a751f89e
[INFO] sha for GitHub repo MindFlavor/bpb: 3b384ae9b753379332855654a28f4091a751f89e
[INFO] validating manifest of MindFlavor/bpb 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 MindFlavor/bpb 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 MindFlavor/bpb
[INFO] finished frobbing MindFlavor/bpb
[INFO] frobbed toml for MindFlavor/bpb written to work/ex/beta-1.38-1/sources/1.37.0/gh/MindFlavor/bpb/Cargo.toml
[INFO] started frobbing MindFlavor/bpb
[INFO] finished frobbing MindFlavor/bpb
[INFO] frobbed toml for MindFlavor/bpb written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MindFlavor/bpb/Cargo.toml
[INFO] crate MindFlavor/bpb 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 MindFlavor/bpb 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/MindFlavor/bpb:/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] 18c19d3011e171a145d9472a24739807d26db68dda473d20d5d7871d766c7fa5
[INFO] running `"docker" "start" "-a" "18c19d3011e171a145d9472a24739807d26db68dda473d20d5d7871d766c7fa5"`
[INFO] [stderr]    Compiling serde_json v1.0.21
[INFO] [stderr]    Compiling bpb v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/main.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 | /         stc.fields
[INFO] [stderr] 63 | |             .iter()
[INFO] [stderr] 64 | |             .filter(|f| !f.optional)
[INFO] [stderr] 65 | |             .map(|bt| abt.push(bt.builder_type.clone().unwrap()))
[INFO] [stderr] 66 | |             .collect::<()>();
[INFO] [stderr]    | |_____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.09s
[INFO] running `"docker" "inspect" "18c19d3011e171a145d9472a24739807d26db68dda473d20d5d7871d766c7fa5"`
[INFO] running `"docker" "rm" "-f" "18c19d3011e171a145d9472a24739807d26db68dda473d20d5d7871d766c7fa5"`
[INFO] [stdout] 18c19d3011e171a145d9472a24739807d26db68dda473d20d5d7871d766c7fa5
[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/MindFlavor/bpb:/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] 138dd76394c59a789428610d287af174a8f3eadd258980b078e38d20023be3c5
[INFO] running `"docker" "start" "-a" "138dd76394c59a789428610d287af174a8f3eadd258980b078e38d20023be3c5"`
[INFO] [stderr]    Compiling bpb v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/main.rs:62:9
[INFO] [stderr]    |
[INFO] [stderr] 62 | /         stc.fields
[INFO] [stderr] 63 | |             .iter()
[INFO] [stderr] 64 | |             .filter(|f| !f.optional)
[INFO] [stderr] 65 | |             .map(|bt| abt.push(bt.builder_type.clone().unwrap()))
[INFO] [stderr] 66 | |             .collect::<()>();
[INFO] [stderr]    | |_____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.47s
[INFO] running `"docker" "inspect" "138dd76394c59a789428610d287af174a8f3eadd258980b078e38d20023be3c5"`
[INFO] running `"docker" "rm" "-f" "138dd76394c59a789428610d287af174a8f3eadd258980b078e38d20023be3c5"`
[INFO] [stdout] 138dd76394c59a789428610d287af174a8f3eadd258980b078e38d20023be3c5
[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/MindFlavor/bpb:/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] 4606498d2daba59ab7569fbcb82b60ef08e2a238a6e73a602003f731cef9371c
[INFO] running `"docker" "start" "-a" "4606498d2daba59ab7569fbcb82b60ef08e2a238a6e73a602003f731cef9371c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/bpb-63b0ad5e27f58582
[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" "4606498d2daba59ab7569fbcb82b60ef08e2a238a6e73a602003f731cef9371c"`
[INFO] running `"docker" "rm" "-f" "4606498d2daba59ab7569fbcb82b60ef08e2a238a6e73a602003f731cef9371c"`
[INFO] [stdout] 4606498d2daba59ab7569fbcb82b60ef08e2a238a6e73a602003f731cef9371c