[INFO] updating cached repository mahulst/rust-playground-w
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/mahulst/rust-playground-w
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/beta-1.38-1/sources/1.37.0/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/mahulst/rust-playground-w'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/mahulst/rust-playground-w" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e981b7f6809b07c226c6f60be4ee92d86899f34f
[INFO] sha for GitHub repo mahulst/rust-playground-w: e981b7f6809b07c226c6f60be4ee92d86899f34f
[INFO] validating manifest of mahulst/rust-playground-w 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 mahulst/rust-playground-w 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 mahulst/rust-playground-w
[INFO] finished frobbing mahulst/rust-playground-w
[INFO] frobbed toml for mahulst/rust-playground-w written to work/ex/beta-1.38-1/sources/1.37.0/gh/mahulst/rust-playground-w/Cargo.toml
[INFO] started frobbing mahulst/rust-playground-w
[INFO] finished frobbing mahulst/rust-playground-w
[INFO] frobbed toml for mahulst/rust-playground-w written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w/Cargo.toml
[INFO] crate mahulst/rust-playground-w 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 mahulst/rust-playground-w against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w:/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 987ed2989ad60d857938f1ebd66e9c7fa6cc2dbe6af9c63b5e37f52c82d6a4e2
[INFO] running `"docker" "start" "-a" "987ed2989ad60d857938f1ebd66e9c7fa6cc2dbe6af9c63b5e37f52c82d6a4e2"`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.09s
[INFO] running `"docker" "inspect" "987ed2989ad60d857938f1ebd66e9c7fa6cc2dbe6af9c63b5e37f52c82d6a4e2"`
[INFO] running `"docker" "rm" "-f" "987ed2989ad60d857938f1ebd66e9c7fa6cc2dbe6af9c63b5e37f52c82d6a4e2"`
[INFO] [stdout] 987ed2989ad60d857938f1ebd66e9c7fa6cc2dbe6af9c63b5e37f52c82d6a4e2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w:/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] ed74b9a94658aa5f65c07a2792161f1b75565f81edb0ac911c70ecb3bee2b977
[INFO] running `"docker" "start" "-a" "ed74b9a94658aa5f65c07a2792161f1b75565f81edb0ac911c70ecb3bee2b977"`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused import: `std::io::prelude`
[INFO] [stderr]  --> src/lib.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::io::prelude::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.83s
[INFO] running `"docker" "inspect" "ed74b9a94658aa5f65c07a2792161f1b75565f81edb0ac911c70ecb3bee2b977"`
[INFO] running `"docker" "rm" "-f" "ed74b9a94658aa5f65c07a2792161f1b75565f81edb0ac911c70ecb3bee2b977"`
[INFO] [stdout] ed74b9a94658aa5f65c07a2792161f1b75565f81edb0ac911c70ecb3bee2b977
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/mahulst/rust-playground-w:/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] ea8b7832e012cf479f473ebb3cf09ff24adaa6966f3c195a7062c370ebc3d61e
[INFO] running `"docker" "start" "-a" "ea8b7832e012cf479f473ebb3cf09ff24adaa6966f3c195a7062c370ebc3d61e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/minigrep-71f1d2ea303b99d3
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test tests::case_sensitive ... ok
[INFO] [stdout] test tests::case_insensitive ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/minigrep-ff2cfaeab7bc6a0d
[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] [stderr]    Doc-tests minigrep
[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" "ea8b7832e012cf479f473ebb3cf09ff24adaa6966f3c195a7062c370ebc3d61e"`
[INFO] running `"docker" "rm" "-f" "ea8b7832e012cf479f473ebb3cf09ff24adaa6966f3c195a7062c370ebc3d61e"`
[INFO] [stdout] ea8b7832e012cf479f473ebb3cf09ff24adaa6966f3c195a7062c370ebc3d61e