[INFO] cloning repository LothTikar/rusty_playlist_maker
[INFO] running `"git" "clone" "--bare" "git://github.com/LothTikar/rusty_playlist_maker.git" "work/cache/sources/gh/LothTikar/rusty_playlist_maker"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/LothTikar/rusty_playlist_maker'...
[INFO] running `"git" "clone" "work/cache/sources/gh/LothTikar/rusty_playlist_maker" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/LothTikar/rusty_playlist_maker"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/LothTikar/rusty_playlist_maker'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LothTikar/rusty_playlist_maker" "work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/LothTikar/rusty_playlist_maker"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/LothTikar/rusty_playlist_maker'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ada27d2ceadbb90eff2a52d42e454837aefd48e6
[INFO] sha for GitHub repo LothTikar/rusty_playlist_maker: ada27d2ceadbb90eff2a52d42e454837aefd48e6
[INFO] validating manifest of LothTikar/rusty_playlist_maker on toolchain master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of LothTikar/rusty_playlist_maker on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing LothTikar/rusty_playlist_maker
[INFO] finished frobbing LothTikar/rusty_playlist_maker
[INFO] frobbed toml for LothTikar/rusty_playlist_maker written to work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/LothTikar/rusty_playlist_maker/Cargo.toml
[INFO] started frobbing LothTikar/rusty_playlist_maker
[INFO] finished frobbing LothTikar/rusty_playlist_maker
[INFO] frobbed toml for LothTikar/rusty_playlist_maker written to work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/LothTikar/rusty_playlist_maker/Cargo.toml
[INFO] crate LothTikar/rusty_playlist_maker already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking LothTikar/rusty_playlist_maker against try#8f81d0bf6baf07b92f1246696722485c4ca0b049 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-4/try#8f81d0bf6baf07b92f1246696722485c4ca0b049:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/LothTikar/rusty_playlist_maker:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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=forbid" "-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" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 725cab3877afdff4d2c78d22a0faa3d4dbc5ff7ec6a6e2819c6bbb67d660eaf3
[INFO] running `"docker" "start" "-a" "725cab3877afdff4d2c78d22a0faa3d4dbc5ff7ec6a6e2819c6bbb67d660eaf3"`
[INFO] [stderr]     Checking memchr v2.0.2
[INFO] [stderr]     Checking csv-core v0.1.4
[INFO] [stderr]     Checking csv v1.0.1
[INFO] [stderr]     Checking rusty_playlist_maker v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |         file.write_all((i + "\n").as_bytes());
[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] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:65:13
[INFO] [stderr]    |
[INFO] [stderr] 65 |             file.write_all(format!("{}\n", i).as_bytes());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |         file.write_all((i + "\n").as_bytes());
[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] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:65:13
[INFO] [stderr]    |
[INFO] [stderr] 65 |             file.write_all(format!("{}\n", i).as_bytes());
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[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 3.26s
[INFO] running `"docker" "inspect" "725cab3877afdff4d2c78d22a0faa3d4dbc5ff7ec6a6e2819c6bbb67d660eaf3"`
[INFO] running `"docker" "rm" "-f" "725cab3877afdff4d2c78d22a0faa3d4dbc5ff7ec6a6e2819c6bbb67d660eaf3"`
[INFO] [stdout] 725cab3877afdff4d2c78d22a0faa3d4dbc5ff7ec6a6e2819c6bbb67d660eaf3