[INFO] crate zlib-src-sys 0.1.2 is already in cache
[INFO] extracting crate zlib-src-sys 0.1.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/zlib-src-sys/0.1.2
[INFO] extracting crate zlib-src-sys 0.1.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/zlib-src-sys/0.1.2
[INFO] validating manifest of zlib-src-sys-0.1.2 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 zlib-src-sys-0.1.2 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 zlib-src-sys-0.1.2
[INFO] finished frobbing zlib-src-sys-0.1.2
[INFO] frobbed toml for zlib-src-sys-0.1.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/zlib-src-sys/0.1.2/Cargo.toml
[INFO] started frobbing zlib-src-sys-0.1.2
[INFO] finished frobbing zlib-src-sys-0.1.2
[INFO] frobbed toml for zlib-src-sys-0.1.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/zlib-src-sys/0.1.2/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 zlib-src-sys-0.1.2 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/zlib-src-sys/0.1.2:/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] b009467236d87b7b6899433e5cabba056b2c41420695c554584cc99239bfb15d
[INFO] running `"docker" "start" "-a" "b009467236d87b7b6899433e5cabba056b2c41420695c554584cc99239bfb15d"`
[INFO] [stderr]    Compiling zlib-src-sys v0.1.2 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]   --> build.rs:14:2
[INFO] [stderr]    |
[INFO] [stderr] 14 |     fs::remove_dir_all(&build_dir).is_ok();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]   --> build.rs:15:2
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fs::create_dir(&build_dir).is_ok();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]   --> build.rs:36:2
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fs::remove_dir_all(&build_dir).is_ok();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_ok` that must be used
[INFO] [stderr]   --> build.rs:37:2
[INFO] [stderr]    |
[INFO] [stderr] 37 |     fs::create_dir(&build_dir).is_ok();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.12s
[INFO] running `"docker" "inspect" "b009467236d87b7b6899433e5cabba056b2c41420695c554584cc99239bfb15d"`
[INFO] running `"docker" "rm" "-f" "b009467236d87b7b6899433e5cabba056b2c41420695c554584cc99239bfb15d"`
[INFO] [stdout] b009467236d87b7b6899433e5cabba056b2c41420695c554584cc99239bfb15d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/zlib-src-sys/0.1.2:/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] 1bc71722cb5b6ece9a1916dbbcb6a3bec7bc353a0f6d2f9350a8c77ae249d7f4
[INFO] running `"docker" "start" "-a" "1bc71722cb5b6ece9a1916dbbcb6a3bec7bc353a0f6d2f9350a8c77ae249d7f4"`
[INFO] [stderr]    Compiling zlib-src-sys v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.59s
[INFO] running `"docker" "inspect" "1bc71722cb5b6ece9a1916dbbcb6a3bec7bc353a0f6d2f9350a8c77ae249d7f4"`
[INFO] running `"docker" "rm" "-f" "1bc71722cb5b6ece9a1916dbbcb6a3bec7bc353a0f6d2f9350a8c77ae249d7f4"`
[INFO] [stdout] 1bc71722cb5b6ece9a1916dbbcb6a3bec7bc353a0f6d2f9350a8c77ae249d7f4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/zlib-src-sys/0.1.2:/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] f01135f980015d3b37b7ffb9c857859a3dda9e6c8dbef9ada4bd3e811464640b
[INFO] running `"docker" "start" "-a" "f01135f980015d3b37b7ffb9c857859a3dda9e6c8dbef9ada4bd3e811464640b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/zlib_sys-1c06323cc3bbaaf5
[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 zlib_sys
[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" "f01135f980015d3b37b7ffb9c857859a3dda9e6c8dbef9ada4bd3e811464640b"`
[INFO] running `"docker" "rm" "-f" "f01135f980015d3b37b7ffb9c857859a3dda9e6c8dbef9ada4bd3e811464640b"`
[INFO] [stdout] f01135f980015d3b37b7ffb9c857859a3dda9e6c8dbef9ada4bd3e811464640b