[INFO] crate test8981 0.1.0 is already in cache
[INFO] extracting crate test8981 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/test8981/0.1.0
[INFO] extracting crate test8981 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/test8981/0.1.0
[INFO] validating manifest of test8981-0.1.0 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 test8981-0.1.0 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 test8981-0.1.0
[INFO] finished frobbing test8981-0.1.0
[INFO] frobbed toml for test8981-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/test8981/0.1.0/Cargo.toml
[INFO] started frobbing test8981-0.1.0
[INFO] finished frobbing test8981-0.1.0
[INFO] frobbed toml for test8981-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/test8981/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 test8981-0.1.0 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/reg/test8981/0.1.0:/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] 7d7499cf3192c42f9a28692548a4a2d93657887ab105dbfe668a96731d4dbc43
[INFO] running `"docker" "start" "-a" "7d7499cf3192c42f9a28692548a4a2d93657887ab105dbfe668a96731d4dbc43"`
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling test8981 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rand_core::RngCore`
[INFO] [stderr]  --> src/lib.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand_core::RngCore;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.63s
[INFO] running `"docker" "inspect" "7d7499cf3192c42f9a28692548a4a2d93657887ab105dbfe668a96731d4dbc43"`
[INFO] running `"docker" "rm" "-f" "7d7499cf3192c42f9a28692548a4a2d93657887ab105dbfe668a96731d4dbc43"`
[INFO] [stdout] 7d7499cf3192c42f9a28692548a4a2d93657887ab105dbfe668a96731d4dbc43
[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/reg/test8981/0.1.0:/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] c89359ae80a4257a02c8009091c4f512b3a2dd16bf688b213e7c9081dd7cdb61
[INFO] running `"docker" "start" "-a" "c89359ae80a4257a02c8009091c4f512b3a2dd16bf688b213e7c9081dd7cdb61"`
[INFO] [stderr]    Compiling test8981 v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `rand_core::RngCore`
[INFO] [stderr]  --> src/lib.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use rand_core::RngCore;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `"docker" "inspect" "c89359ae80a4257a02c8009091c4f512b3a2dd16bf688b213e7c9081dd7cdb61"`
[INFO] running `"docker" "rm" "-f" "c89359ae80a4257a02c8009091c4f512b3a2dd16bf688b213e7c9081dd7cdb61"`
[INFO] [stdout] c89359ae80a4257a02c8009091c4f512b3a2dd16bf688b213e7c9081dd7cdb61
[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/reg/test8981/0.1.0:/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] f64ddd441bb0e8058a6740447d8d0717f6931c4fa7a240ea98b0dc48c69dc3e7
[INFO] running `"docker" "start" "-a" "f64ddd441bb0e8058a6740447d8d0717f6931c4fa7a240ea98b0dc48c69dc3e7"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/test8981-617dad39f6a53fba
[INFO] [stderr]    Doc-tests test8981
[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] [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" "f64ddd441bb0e8058a6740447d8d0717f6931c4fa7a240ea98b0dc48c69dc3e7"`
[INFO] running `"docker" "rm" "-f" "f64ddd441bb0e8058a6740447d8d0717f6931c4fa7a240ea98b0dc48c69dc3e7"`
[INFO] [stdout] f64ddd441bb0e8058a6740447d8d0717f6931c4fa7a240ea98b0dc48c69dc3e7