[INFO] updating cached repository https://github.com/ZivxXxY/mandelbrot
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 67eaa51d0024acbca386ffa5e0bc16fd206d2cfb
[INFO] checking ZivxXxY/mandelbrot against master#4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb for pr-64672
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FZivxXxY%2Fmandelbrot" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ZivxXxY/mandelbrot on toolchain 4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ZivxXxY/mandelbrot
[INFO] finished tweaking git repo https://github.com/ZivxXxY/mandelbrot
[INFO] tweaked toml for git repo https://github.com/ZivxXxY/mandelbrot written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/ZivxXxY/mandelbrot already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+4ff32c07da9d97e6dc315a4a5c9ffbb797cb27bb" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] c9e6c73628a3b558a189c4dfa6007327eb01bb65723f2e84d8244fe4c6bdc5b5
[INFO] running `"docker" "start" "-a" "c9e6c73628a3b558a189c4dfa6007327eb01bb65723f2e84d8244fe4c6bdc5b5"`
[INFO] [stderr]    Compiling syn v0.15.43
[INFO] [stderr]     Checking num-complex v0.2.3
[INFO] [stderr]     Checking num-rational v0.2.2
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]    Compiling num-derive v0.2.5
[INFO] [stderr]     Checking tiff v0.3.1
[INFO] [stderr]     Checking image v0.22.1
[INFO] [stderr]     Checking mandelbrot v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:136:9
[INFO] [stderr]     |
[INFO] [stderr] 136 | /         crossbeam::scope(|spawner| {
[INFO] [stderr] 137 | |             for (i, band) in bands.into_iter().enumerate() {
[INFO] [stderr] 138 | |                 let top = rows_per_band * i;
[INFO] [stderr] 139 | |                 let height = band.len() / bounds.0;
[INFO] [stderr] ...   |
[INFO] [stderr] 147 | |             }
[INFO] [stderr] 148 | |         });
[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:136:9
[INFO] [stderr]     |
[INFO] [stderr] 136 | /         crossbeam::scope(|spawner| {
[INFO] [stderr] 137 | |             for (i, band) in bands.into_iter().enumerate() {
[INFO] [stderr] 138 | |                 let top = rows_per_band * i;
[INFO] [stderr] 139 | |                 let height = band.len() / bounds.0;
[INFO] [stderr] ...   |
[INFO] [stderr] 147 | |             }
[INFO] [stderr] 148 | |         });
[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 28.84s
[INFO] running `"docker" "inspect" "c9e6c73628a3b558a189c4dfa6007327eb01bb65723f2e84d8244fe4c6bdc5b5"`
[INFO] running `"docker" "rm" "-f" "c9e6c73628a3b558a189c4dfa6007327eb01bb65723f2e84d8244fe4c6bdc5b5"`
[INFO] [stdout] c9e6c73628a3b558a189c4dfa6007327eb01bb65723f2e84d8244fe4c6bdc5b5