[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-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/thara/mandelbrot-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/thara/mandelbrot-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/thara/mandelbrot-rust" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/thara/mandelbrot-rust"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/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#60960a260f7b5c695fd0717311d72ce62dd4eb43
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of thara/mandelbrot-rust on toolchain try#266783e4e09e4e9d5307c1c8e695659c58bbcac7
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-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-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/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-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/thara/mandelbrot-rust/Cargo.toml
[INFO] crate thara/mandelbrot-rust already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking thara/mandelbrot-rust against master#60960a260f7b5c695fd0717311d72ce62dd4eb43 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-4/master#60960a260f7b5c695fd0717311d72ce62dd4eb43:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/thara/mandelbrot-rust:/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=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" "+60960a260f7b5c695fd0717311d72ce62dd4eb43-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 5b13beeae489ddec86a972068eca9b9a0d516a2418b31a6e4cd91fdeea7838c3
[INFO] running `"docker" "start" "-a" "5b13beeae489ddec86a972068eca9b9a0d516a2418b31a6e4cd91fdeea7838c3"`
[INFO] [stderr]    Compiling libc v0.2.47
[INFO] [stderr]    Compiling proc-macro2 v0.4.25
[INFO] [stderr]     Checking rand_chacha v0.1.1
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]     Checking rand_os v0.1.1
[INFO] [stderr]     Checking num_cpus v1.9.0
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]     Checking rand v0.6.4
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]     Checking rayon v1.0.3
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]     Checking crossbeam-channel v0.3.6
[INFO] [stderr]     Checking crossbeam v0.6.0
[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 30.72s
[INFO] running `"docker" "inspect" "5b13beeae489ddec86a972068eca9b9a0d516a2418b31a6e4cd91fdeea7838c3"`
[INFO] running `"docker" "rm" "-f" "5b13beeae489ddec86a972068eca9b9a0d516a2418b31a6e4cd91fdeea7838c3"`
[INFO] [stdout] 5b13beeae489ddec86a972068eca9b9a0d516a2418b31a6e4cd91fdeea7838c3