[INFO] updating cached repository kk1fff/backprop
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kk1fff/backprop
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kk1fff/backprop" "work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kk1fff/backprop" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kk1fff/backprop"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kk1fff/backprop'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d1f30e9edd4f6f5cbd325482566ab28cd9c8b54f
[INFO] sha for GitHub repo kk1fff/backprop: d1f30e9edd4f6f5cbd325482566ab28cd9c8b54f
[INFO] validating manifest of kk1fff/backprop 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 kk1fff/backprop 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 kk1fff/backprop
[INFO] finished frobbing kk1fff/backprop
[INFO] frobbed toml for kk1fff/backprop written to work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop/Cargo.toml
[INFO] started frobbing kk1fff/backprop
[INFO] finished frobbing kk1fff/backprop
[INFO] frobbed toml for kk1fff/backprop written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kk1fff/backprop/Cargo.toml
[INFO] crate kk1fff/backprop 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 kk1fff/backprop 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop:/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] 64420c29690acc328797666c2f1822a47f26dc6cbf836064d5d82ffd1d94c549
[INFO] running `"docker" "start" "-a" "64420c29690acc328797666c2f1822a47f26dc6cbf836064d5d82ffd1d94c549"`
[INFO] [stderr]    Compiling backprop v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/main.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/main.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `op_set`
[INFO] [stderr]   --> src/main.rs:94:5
[INFO] [stderr]    |
[INFO] [stderr] 94 |     op_set: HashSet<String>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "64420c29690acc328797666c2f1822a47f26dc6cbf836064d5d82ffd1d94c549"`
[INFO] running `"docker" "rm" "-f" "64420c29690acc328797666c2f1822a47f26dc6cbf836064d5d82ffd1d94c549"`
[INFO] [stdout] 64420c29690acc328797666c2f1822a47f26dc6cbf836064d5d82ffd1d94c549
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop:/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] 587764ae48ad000c4415b6bce5113cafb8cd4c370207039ce815aca891d49a30
[INFO] running `"docker" "start" "-a" "587764ae48ad000c4415b6bce5113cafb8cd4c370207039ce815aca891d49a30"`
[INFO] [stderr]    Compiling backprop v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/main.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `name`
[INFO] [stderr]   --> src/main.rs:93:5
[INFO] [stderr]    |
[INFO] [stderr] 93 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `op_set`
[INFO] [stderr]   --> src/main.rs:94:5
[INFO] [stderr]    |
[INFO] [stderr] 94 |     op_set: HashSet<String>,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.69s
[INFO] running `"docker" "inspect" "587764ae48ad000c4415b6bce5113cafb8cd4c370207039ce815aca891d49a30"`
[INFO] running `"docker" "rm" "-f" "587764ae48ad000c4415b6bce5113cafb8cd4c370207039ce815aca891d49a30"`
[INFO] [stdout] 587764ae48ad000c4415b6bce5113cafb8cd4c370207039ce815aca891d49a30
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kk1fff/backprop:/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] 36b999ba65fc12431d5c426ff94a98d54a3c0c5657f33a476b5798dda049ca4e
[INFO] running `"docker" "start" "-a" "36b999ba65fc12431d5c426ff94a98d54a3c0c5657f33a476b5798dda049ca4e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/backprop-412bd17c8ff0f60b
[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" "36b999ba65fc12431d5c426ff94a98d54a3c0c5657f33a476b5798dda049ca4e"`
[INFO] running `"docker" "rm" "-f" "36b999ba65fc12431d5c426ff94a98d54a3c0c5657f33a476b5798dda049ca4e"`
[INFO] [stdout] 36b999ba65fc12431d5c426ff94a98d54a3c0c5657f33a476b5798dda049ca4e