[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-1.37-6/sources/1.36.0/reg/zlib-src-sys/0.1.2
[INFO] extracting crate zlib-src-sys 0.1.2 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/zlib-src-sys/0.1.2
[INFO] validating manifest of zlib-src-sys-0.1.2 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 zlib-src-sys-0.1.2 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 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-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/reg/zlib-src-sys/0.1.2/Cargo.toml
[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 zlib-src-sys-0.1.2 against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 07ece549102c97989192a8c28c9da981b7b02dbf56b4120b8be1025e8555e0c4
[INFO] running `"docker" "start" "-a" "07ece549102c97989192a8c28c9da981b7b02dbf56b4120b8be1025e8555e0c4"`
[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 9.44s
[INFO] running `"docker" "inspect" "07ece549102c97989192a8c28c9da981b7b02dbf56b4120b8be1025e8555e0c4"`
[INFO] running `"docker" "rm" "-f" "07ece549102c97989192a8c28c9da981b7b02dbf56b4120b8be1025e8555e0c4"`
[INFO] [stdout] 07ece549102c97989192a8c28c9da981b7b02dbf56b4120b8be1025e8555e0c4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 65afef51357df033ca737fc8bc10e40ae68953109738d6be2b3fc8d888d43544
[INFO] running `"docker" "start" "-a" "65afef51357df033ca737fc8bc10e40ae68953109738d6be2b3fc8d888d43544"`
[INFO] [stderr]    Compiling zlib-src-sys v0.1.2 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `"docker" "inspect" "65afef51357df033ca737fc8bc10e40ae68953109738d6be2b3fc8d888d43544"`
[INFO] running `"docker" "rm" "-f" "65afef51357df033ca737fc8bc10e40ae68953109738d6be2b3fc8d888d43544"`
[INFO] [stdout] 65afef51357df033ca737fc8bc10e40ae68953109738d6be2b3fc8d888d43544
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] 3d0f5570a4379fbf0ca410e0b7ed75c235da671f25caf8a5734ed7b1429b32d5
[INFO] running `"docker" "start" "-a" "3d0f5570a4379fbf0ca410e0b7ed75c235da671f25caf8a5734ed7b1429b32d5"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/zlib_sys-288570a0562e7611
[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] [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" "3d0f5570a4379fbf0ca410e0b7ed75c235da671f25caf8a5734ed7b1429b32d5"`
[INFO] running `"docker" "rm" "-f" "3d0f5570a4379fbf0ca410e0b7ed75c235da671f25caf8a5734ed7b1429b32d5"`
[INFO] [stdout] 3d0f5570a4379fbf0ca410e0b7ed75c235da671f25caf8a5734ed7b1429b32d5