[INFO] updating cached repository zhaihj/rust-play-ground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/zhaihj/rust-play-ground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/zhaihj/rust-play-ground" "work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/zhaihj/rust-play-ground" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zhaihj/rust-play-ground"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zhaihj/rust-play-ground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 7518e53f966e8c30644755ca289ee59c1d0e0a21
[INFO] sha for GitHub repo zhaihj/rust-play-ground: 7518e53f966e8c30644755ca289ee59c1d0e0a21
[INFO] validating manifest of zhaihj/rust-play-ground 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 zhaihj/rust-play-ground 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 zhaihj/rust-play-ground
[INFO] finished frobbing zhaihj/rust-play-ground
[INFO] frobbed toml for zhaihj/rust-play-ground written to work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground/Cargo.toml
[INFO] started frobbing zhaihj/rust-play-ground
[INFO] finished frobbing zhaihj/rust-play-ground
[INFO] frobbed toml for zhaihj/rust-play-ground written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/zhaihj/rust-play-ground/Cargo.toml
[INFO] crate zhaihj/rust-play-ground 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 zhaihj/rust-play-ground 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground:/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] e33d7184bb4ee88ccdfbf7ea64dd8af04032e9652db7314eabdab2ecdf6700a7
[INFO] running `"docker" "start" "-a" "e33d7184bb4ee88ccdfbf7ea64dd8af04032e9652db7314eabdab2ecdf6700a7"`
[INFO] [stderr]    Compiling libc v0.2.19
[INFO] [stderr]    Compiling byteorder v1.0.0
[INFO] [stderr]    Compiling rustc-serialize v0.3.22
[INFO] [stderr]    Compiling memchr v1.0.1
[INFO] [stderr]    Compiling csv v0.15.0
[INFO] [stderr]    Compiling csv-read-test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/bin/read-csv-matrix.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     f.read_to_string(&mut s);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.82s
[INFO] running `"docker" "inspect" "e33d7184bb4ee88ccdfbf7ea64dd8af04032e9652db7314eabdab2ecdf6700a7"`
[INFO] running `"docker" "rm" "-f" "e33d7184bb4ee88ccdfbf7ea64dd8af04032e9652db7314eabdab2ecdf6700a7"`
[INFO] [stdout] e33d7184bb4ee88ccdfbf7ea64dd8af04032e9652db7314eabdab2ecdf6700a7
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground:/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] 8178c9e8064aac33372125145f99fba61f31b9fa880499a974ee6c54ac6dd8a4
[INFO] running `"docker" "start" "-a" "8178c9e8064aac33372125145f99fba61f31b9fa880499a974ee6c54ac6dd8a4"`
[INFO] [stderr]    Compiling csv-read-test v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]  --> src/bin/read-csv-matrix.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     f.read_to_string(&mut s);
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]   = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.57s
[INFO] running `"docker" "inspect" "8178c9e8064aac33372125145f99fba61f31b9fa880499a974ee6c54ac6dd8a4"`
[INFO] running `"docker" "rm" "-f" "8178c9e8064aac33372125145f99fba61f31b9fa880499a974ee6c54ac6dd8a4"`
[INFO] [stdout] 8178c9e8064aac33372125145f99fba61f31b9fa880499a974ee6c54ac6dd8a4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/zhaihj/rust-play-ground:/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] b663be697c24d93f15f46101613f3a31ad1c80460ce7e5966b148ae1411f2a43
[INFO] running `"docker" "start" "-a" "b663be697c24d93f15f46101613f3a31ad1c80460ce7e5966b148ae1411f2a43"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/read_csv_matrix-604afa09650a3fea
[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" "b663be697c24d93f15f46101613f3a31ad1c80460ce7e5966b148ae1411f2a43"`
[INFO] running `"docker" "rm" "-f" "b663be697c24d93f15f46101613f3a31ad1c80460ce7e5966b148ae1411f2a43"`
[INFO] [stdout] b663be697c24d93f15f46101613f3a31ad1c80460ce7e5966b148ae1411f2a43