[INFO] crate iolaus 0.1.7 is already in cache
[INFO] extracting crate iolaus 0.1.7 into work/ex/beta-1.37-6/sources/1.36.0/reg/iolaus/0.1.7
[INFO] extracting crate iolaus 0.1.7 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/iolaus/0.1.7
[INFO] validating manifest of iolaus-0.1.7 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 iolaus-0.1.7 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 iolaus-0.1.7
[INFO] finished frobbing iolaus-0.1.7
[INFO] frobbed toml for iolaus-0.1.7 written to work/ex/beta-1.37-6/sources/1.36.0/reg/iolaus/0.1.7/Cargo.toml
[INFO] started frobbing iolaus-0.1.7
[INFO] finished frobbing iolaus-0.1.7
[INFO] frobbed toml for iolaus-0.1.7 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/iolaus/0.1.7/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 iolaus-0.1.7 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/iolaus/0.1.7:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 31371f5aeebb843a1acd316876ae6e8cae7b50d14ba50ab4d1b4bfbbda3a40a3
[INFO] running `"docker" "start" "-a" "31371f5aeebb843a1acd316876ae6e8cae7b50d14ba50ab4d1b4bfbbda3a40a3"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling iolaus v0.1.7 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut base_path = env::current_dir().expect("Erro #0001");
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.74s
[INFO] running `"docker" "inspect" "31371f5aeebb843a1acd316876ae6e8cae7b50d14ba50ab4d1b4bfbbda3a40a3"`
[INFO] running `"docker" "rm" "-f" "31371f5aeebb843a1acd316876ae6e8cae7b50d14ba50ab4d1b4bfbbda3a40a3"`
[INFO] [stdout] 31371f5aeebb843a1acd316876ae6e8cae7b50d14ba50ab4d1b4bfbbda3a40a3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/iolaus/0.1.7:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 94d0462e50de5d0b273fbef53e401b0d51741b4c8341ccc5d2eded061bcf34ba
[INFO] running `"docker" "start" "-a" "94d0462e50de5d0b273fbef53e401b0d51741b4c8341ccc5d2eded061bcf34ba"`
[INFO] [stderr]    Compiling iolaus v0.1.7 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let mut base_path = env::current_dir().expect("Erro #0001");
[INFO] [stderr]    |         ----^^^^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.78s
[INFO] running `"docker" "inspect" "94d0462e50de5d0b273fbef53e401b0d51741b4c8341ccc5d2eded061bcf34ba"`
[INFO] running `"docker" "rm" "-f" "94d0462e50de5d0b273fbef53e401b0d51741b4c8341ccc5d2eded061bcf34ba"`
[INFO] [stdout] 94d0462e50de5d0b273fbef53e401b0d51741b4c8341ccc5d2eded061bcf34ba
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/iolaus/0.1.7:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 220f71e8f3badd9f37f01611a13d7d9279e112378879a60dd70ad4cfd1e42a4d
[INFO] running `"docker" "start" "-a" "220f71e8f3badd9f37f01611a13d7d9279e112378879a60dd70ad4cfd1e42a4d"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/iolaus-b61ee24410b9c382
[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" "220f71e8f3badd9f37f01611a13d7d9279e112378879a60dd70ad4cfd1e42a4d"`
[INFO] running `"docker" "rm" "-f" "220f71e8f3badd9f37f01611a13d7d9279e112378879a60dd70ad4cfd1e42a4d"`
[INFO] [stdout] 220f71e8f3badd9f37f01611a13d7d9279e112378879a60dd70ad4cfd1e42a4d