[INFO] updating cached repository skade/strand
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/skade/strand
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/skade/strand" "work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/skade/strand" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/skade/strand"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/skade/strand'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f2cd2549b2360c5e15e67c5ad7a7ebe2c3fa7fcb
[INFO] sha for GitHub repo skade/strand: f2cd2549b2360c5e15e67c5ad7a7ebe2c3fa7fcb
[INFO] validating manifest of skade/strand 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 skade/strand 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 skade/strand
[INFO] finished frobbing skade/strand
[INFO] frobbed toml for skade/strand written to work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand/Cargo.toml
[INFO] started frobbing skade/strand
[INFO] finished frobbing skade/strand
[INFO] frobbed toml for skade/strand written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/skade/strand/Cargo.toml
[INFO] crate skade/strand 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] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 skade/strand 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-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand:/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] 20d9429e5315b130fb716247a8cb4c27e6c48a2e30850e081aaf7c3063b0e654
[INFO] running `"docker" "start" "-a" "20d9429e5315b130fb716247a8cb4c27e6c48a2e30850e081aaf7c3063b0e654"`
[INFO] [stderr]    Compiling strand v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `"docker" "inspect" "20d9429e5315b130fb716247a8cb4c27e6c48a2e30850e081aaf7c3063b0e654"`
[INFO] running `"docker" "rm" "-f" "20d9429e5315b130fb716247a8cb4c27e6c48a2e30850e081aaf7c3063b0e654"`
[INFO] [stdout] 20d9429e5315b130fb716247a8cb4c27e6c48a2e30850e081aaf7c3063b0e654
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand:/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] 3183c7371d914ebb72c536863d92deb81e0b7bad45a7144ffb95590236b5f925
[INFO] running `"docker" "start" "-a" "3183c7371d914ebb72c536863d92deb81e0b7bad45a7144ffb95590236b5f925"`
[INFO] [stderr]    Compiling strand v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.64s
[INFO] running `"docker" "inspect" "3183c7371d914ebb72c536863d92deb81e0b7bad45a7144ffb95590236b5f925"`
[INFO] running `"docker" "rm" "-f" "3183c7371d914ebb72c536863d92deb81e0b7bad45a7144ffb95590236b5f925"`
[INFO] [stdout] 3183c7371d914ebb72c536863d92deb81e0b7bad45a7144ffb95590236b5f925
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/skade/strand:/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] 5c76bb282e90def6b4f49773891cd47149869cfa7f79f2a1958942d5eed18893
[INFO] running `"docker" "start" "-a" "5c76bb282e90def6b4f49773891cd47149869cfa7f79f2a1958942d5eed18893"`
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/strand-a1c36f75ee664e3c
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/immutable-b2f43b87f7c9c780
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mutable-83095631b77c5ca5
[INFO] [stdout] test tests::test_branch ... ok
[INFO] [stdout] test tests::test_state_changes ... ok
[INFO] [stdout] test tests::test_unmet_pre_condition ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_branch ... ok
[INFO] [stdout] test tests::test_state_changes ... ok
[INFO] [stdout] test tests::test_unmet_pre_condition ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests strand
[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" "5c76bb282e90def6b4f49773891cd47149869cfa7f79f2a1958942d5eed18893"`
[INFO] running `"docker" "rm" "-f" "5c76bb282e90def6b4f49773891cd47149869cfa7f79f2a1958942d5eed18893"`
[INFO] [stdout] 5c76bb282e90def6b4f49773891cd47149869cfa7f79f2a1958942d5eed18893