[INFO] crate happiness_cli 0.1.31 is already in cache
[INFO] extracting crate happiness_cli 0.1.31 into work/ex/beta-1.38-1/sources/1.37.0/reg/happiness_cli/0.1.31
[INFO] extracting crate happiness_cli 0.1.31 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/happiness_cli/0.1.31
[INFO] validating manifest of happiness_cli-0.1.31 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 happiness_cli-0.1.31 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 happiness_cli-0.1.31
[INFO] finished frobbing happiness_cli-0.1.31
[INFO] frobbed toml for happiness_cli-0.1.31 written to work/ex/beta-1.38-1/sources/1.37.0/reg/happiness_cli/0.1.31/Cargo.toml
[INFO] started frobbing happiness_cli-0.1.31
[INFO] finished frobbing happiness_cli-0.1.31
[INFO] frobbed toml for happiness_cli-0.1.31 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/happiness_cli/0.1.31/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 happiness_cli-0.1.31 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/reg/happiness_cli/0.1.31:/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] feacd0545e0264e12b889899fa8ae806df254c6926300c6370a5df0d1e6c5626
[INFO] running `"docker" "start" "-a" "feacd0545e0264e12b889899fa8ae806df254c6926300c6370a5df0d1e6c5626"`
[INFO] [stderr]    Compiling happiness_cli v0.1.31 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:291:2
[INFO] [stderr]     |
[INFO] [stderr] 291 |     fs::create_dir("./data_happiness");
[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 2.47s
[INFO] running `"docker" "inspect" "feacd0545e0264e12b889899fa8ae806df254c6926300c6370a5df0d1e6c5626"`
[INFO] running `"docker" "rm" "-f" "feacd0545e0264e12b889899fa8ae806df254c6926300c6370a5df0d1e6c5626"`
[INFO] [stdout] feacd0545e0264e12b889899fa8ae806df254c6926300c6370a5df0d1e6c5626
[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/reg/happiness_cli/0.1.31:/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] 1ff5ec3f427eae91e3490895f89747ddeade0b2286c3bb2610301b6845a5de4d
[INFO] running `"docker" "start" "-a" "1ff5ec3f427eae91e3490895f89747ddeade0b2286c3bb2610301b6845a5de4d"`
[INFO] [stderr]    Compiling happiness_cli v0.1.31 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:291:2
[INFO] [stderr]     |
[INFO] [stderr] 291 |     fs::create_dir("./data_happiness");
[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 0.98s
[INFO] running `"docker" "inspect" "1ff5ec3f427eae91e3490895f89747ddeade0b2286c3bb2610301b6845a5de4d"`
[INFO] running `"docker" "rm" "-f" "1ff5ec3f427eae91e3490895f89747ddeade0b2286c3bb2610301b6845a5de4d"`
[INFO] [stdout] 1ff5ec3f427eae91e3490895f89747ddeade0b2286c3bb2610301b6845a5de4d
[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/reg/happiness_cli/0.1.31:/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] fb3b186b7175e7e3b4e4de7b29f6e63c64575cb9cd9d0d6f88022c5eb96dbad7
[INFO] running `"docker" "start" "-a" "fb3b186b7175e7e3b4e4de7b29f6e63c64575cb9cd9d0d6f88022c5eb96dbad7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/happiness_cli-e6fb1c68ef699b1d
[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" "fb3b186b7175e7e3b4e4de7b29f6e63c64575cb9cd9d0d6f88022c5eb96dbad7"`
[INFO] running `"docker" "rm" "-f" "fb3b186b7175e7e3b4e4de7b29f6e63c64575cb9cd9d0d6f88022c5eb96dbad7"`
[INFO] [stdout] fb3b186b7175e7e3b4e4de7b29f6e63c64575cb9cd9d0d6f88022c5eb96dbad7