[INFO] updating cached repository kkloberdanz/stutter
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kkloberdanz/stutter
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kkloberdanz/stutter" "work/ex/beta-1.37-6/sources/1.36.0/gh/kkloberdanz/stutter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/kkloberdanz/stutter'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kkloberdanz/stutter" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0a83a266d91e27341ccf9597cce79d110d0c91a1
[INFO] sha for GitHub repo kkloberdanz/stutter: 0a83a266d91e27341ccf9597cce79d110d0c91a1
[INFO] validating manifest of kkloberdanz/stutter 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 kkloberdanz/stutter 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 kkloberdanz/stutter
[INFO] finished frobbing kkloberdanz/stutter
[INFO] frobbed toml for kkloberdanz/stutter written to work/ex/beta-1.37-6/sources/1.36.0/gh/kkloberdanz/stutter/Cargo.toml
[INFO] started frobbing kkloberdanz/stutter
[INFO] finished frobbing kkloberdanz/stutter
[INFO] frobbed toml for kkloberdanz/stutter written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter/Cargo.toml
[INFO] crate kkloberdanz/stutter 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] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing kkloberdanz/stutter against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter:/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 49b40fd27d29da86ae6a82c95c181108d2d524044181c09ef8df9915445e53b5
[INFO] running `"docker" "start" "-a" "49b40fd27d29da86ae6a82c95c181108d2d524044181c09ef8df9915445e53b5"`
[INFO] [stderr]    Compiling rpds v0.6.0
[INFO] [stderr]    Compiling crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling stutter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rpds::Vector`
[INFO] [stderr]   --> src/main.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use rpds::Vector;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `op`
[INFO] [stderr]    --> src/main.rs:399:5
[INFO] [stderr]     |
[INFO] [stderr] 399 |     op: &Op,
[INFO] [stderr]     |     ^^ help: consider prefixing with an underscore: `_op`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.32s
[INFO] running `"docker" "inspect" "49b40fd27d29da86ae6a82c95c181108d2d524044181c09ef8df9915445e53b5"`
[INFO] running `"docker" "rm" "-f" "49b40fd27d29da86ae6a82c95c181108d2d524044181c09ef8df9915445e53b5"`
[INFO] [stdout] 49b40fd27d29da86ae6a82c95c181108d2d524044181c09ef8df9915445e53b5
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter:/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0109486856d8a090f838a7f93eca99761178706951f261d5559a41986587c5fd
[INFO] running `"docker" "start" "-a" "0109486856d8a090f838a7f93eca99761178706951f261d5559a41986587c5fd"`
[INFO] [stderr]    Compiling stutter v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rpds::Vector`
[INFO] [stderr]   --> src/main.rs:18:5
[INFO] [stderr]    |
[INFO] [stderr] 18 | use rpds::Vector;
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `op`
[INFO] [stderr]    --> src/main.rs:399:5
[INFO] [stderr]     |
[INFO] [stderr] 399 |     op: &Op,
[INFO] [stderr]     |     ^^ help: consider prefixing with an underscore: `_op`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.28s
[INFO] running `"docker" "inspect" "0109486856d8a090f838a7f93eca99761178706951f261d5559a41986587c5fd"`
[INFO] running `"docker" "rm" "-f" "0109486856d8a090f838a7f93eca99761178706951f261d5559a41986587c5fd"`
[INFO] [stdout] 0109486856d8a090f838a7f93eca99761178706951f261d5559a41986587c5fd
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/kkloberdanz/stutter:/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] f1f9b6b9cceb7952ae7d7f4e119a8b3d51296485918cbe3bad73e400af072335
[INFO] running `"docker" "start" "-a" "f1f9b6b9cceb7952ae7d7f4e119a8b3d51296485918cbe3bad73e400af072335"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/stutter-4e070b3431f4bbd7
[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" "f1f9b6b9cceb7952ae7d7f4e119a8b3d51296485918cbe3bad73e400af072335"`
[INFO] running `"docker" "rm" "-f" "f1f9b6b9cceb7952ae7d7f4e119a8b3d51296485918cbe3bad73e400af072335"`
[INFO] [stdout] f1f9b6b9cceb7952ae7d7f4e119a8b3d51296485918cbe3bad73e400af072335