[INFO] updating cached repository thara/mandelbrot-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/thara/mandelbrot-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/thara/mandelbrot-rust" "work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/gh/thara/mandelbrot-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/gh/thara/mandelbrot-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/thara/mandelbrot-rust" "work/ex/pr-60932/sources/try#097e26225c5cc28d3042ad4c80eac7c488f78ee7/gh/thara/mandelbrot-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-60932/sources/try#097e26225c5cc28d3042ad4c80eac7c488f78ee7/gh/thara/mandelbrot-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 86144d0cc5c9da1850cb0205d8b75c0ecb514a85
[INFO] sha for GitHub repo thara/mandelbrot-rust: 86144d0cc5c9da1850cb0205d8b75c0ecb514a85
[INFO] validating manifest of thara/mandelbrot-rust on toolchain master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+548add7f61bfcbe3bea3f5ccefb53c84da8fefe4-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of thara/mandelbrot-rust on toolchain try#097e26225c5cc28d3042ad4c80eac7c488f78ee7
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+097e26225c5cc28d3042ad4c80eac7c488f78ee7-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing thara/mandelbrot-rust
[INFO] finished frobbing thara/mandelbrot-rust
[INFO] frobbed toml for thara/mandelbrot-rust written to work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/gh/thara/mandelbrot-rust/Cargo.toml
[INFO] started frobbing thara/mandelbrot-rust
[INFO] finished frobbing thara/mandelbrot-rust
[INFO] frobbed toml for thara/mandelbrot-rust written to work/ex/pr-60932/sources/try#097e26225c5cc28d3042ad4c80eac7c488f78ee7/gh/thara/mandelbrot-rust/Cargo.toml
[INFO] crate thara/mandelbrot-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+548add7f61bfcbe3bea3f5ccefb53c84da8fefe4-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+097e26225c5cc28d3042ad4c80eac7c488f78ee7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking thara/mandelbrot-rust against master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4 for pr-60932
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60932/worker-7/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60932/sources/master#548add7f61bfcbe3bea3f5ccefb53c84da8fefe4/gh/thara/mandelbrot-rust:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+548add7f61bfcbe3bea3f5ccefb53c84da8fefe4-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 224b85fc65d3fe1b8e94a7403d60e41a09d750623817cf3da645410ad87c7f08
[INFO] running `"docker" "start" "-a" "224b85fc65d3fe1b8e94a7403d60e41a09d750623817cf3da645410ad87c7f08"`
[INFO] [stderr]    Compiling proc-macro2 v0.4.25
[INFO] [stderr]     Checking safe-transmute v0.10.1
[INFO] [stderr]     Checking num_cpus v1.9.0
[INFO] [stderr]     Checking num-rational v0.2.1
[INFO] [stderr]     Checking png v0.14.0
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking rayon v1.0.3
[INFO] [stderr]     Checking crossbeam-channel v0.3.6
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]     Checking crossbeam v0.6.0
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]     Checking jpeg-decoder v0.1.15
[INFO] [stderr]    Compiling num-derive v0.2.3
[INFO] [stderr]     Checking tiff v0.2.1
[INFO] [stderr]     Checking image v0.21.0
[INFO] [stderr]     Checking mandelbrot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 | /     encoder.encode(
[INFO] [stderr] 121 | |         &pixels,
[INFO] [stderr] 122 | |         bounds.0 as u32,
[INFO] [stderr] 123 | |         bounds.1 as u32,
[INFO] [stderr] 124 | |         ColorType::Gray(8),
[INFO] [stderr] 125 | |     );
[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:157:9
[INFO] [stderr]     |
[INFO] [stderr] 157 | /         crossbeam::scope(|spawner| {
[INFO] [stderr] 158 | |             for (i, band) in bands.into_iter().enumerate() {
[INFO] [stderr] 159 | |                 let top = rows_per_band * i;
[INFO] [stderr] 160 | |                 let height = band.len() / bounds.0;
[INFO] [stderr] ...   |
[INFO] [stderr] 167 | |             }
[INFO] [stderr] 168 | |         });
[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:120:5
[INFO] [stderr]     |
[INFO] [stderr] 120 | /     encoder.encode(
[INFO] [stderr] 121 | |         &pixels,
[INFO] [stderr] 122 | |         bounds.0 as u32,
[INFO] [stderr] 123 | |         bounds.1 as u32,
[INFO] [stderr] 124 | |         ColorType::Gray(8),
[INFO] [stderr] 125 | |     );
[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:157:9
[INFO] [stderr]     |
[INFO] [stderr] 157 | /         crossbeam::scope(|spawner| {
[INFO] [stderr] 158 | |             for (i, band) in bands.into_iter().enumerate() {
[INFO] [stderr] 159 | |                 let top = rows_per_band * i;
[INFO] [stderr] 160 | |                 let height = band.len() / bounds.0;
[INFO] [stderr] ...   |
[INFO] [stderr] 167 | |             }
[INFO] [stderr] 168 | |         });
[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 24.84s
[INFO] running `"docker" "inspect" "224b85fc65d3fe1b8e94a7403d60e41a09d750623817cf3da645410ad87c7f08"`
[INFO] running `"docker" "rm" "-f" "224b85fc65d3fe1b8e94a7403d60e41a09d750623817cf3da645410ad87c7f08"`
[INFO] [stdout] 224b85fc65d3fe1b8e94a7403d60e41a09d750623817cf3da645410ad87c7f08