[INFO] updating cached repository Jess3Jane/mandelbrot_v2
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Jess3Jane/mandelbrot_v2
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2" "work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Jess3Jane/mandelbrot_v2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2" "work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Jess3Jane/mandelbrot_v2'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 732b53a51334d75d31a0da98b52dd9c372278261
[INFO] sha for GitHub repo Jess3Jane/mandelbrot_v2: 732b53a51334d75d31a0da98b52dd9c372278261
[INFO] validating manifest of Jess3Jane/mandelbrot_v2 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 Jess3Jane/mandelbrot_v2 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 Jess3Jane/mandelbrot_v2
[INFO] finished frobbing Jess3Jane/mandelbrot_v2
[INFO] frobbed toml for Jess3Jane/mandelbrot_v2 written to work/ex/pr-63376/sources/master#60960a260f7b5c695fd0717311d72ce62dd4eb43/gh/Jess3Jane/mandelbrot_v2/Cargo.toml
[INFO] started frobbing Jess3Jane/mandelbrot_v2
[INFO] finished frobbing Jess3Jane/mandelbrot_v2
[INFO] frobbed toml for Jess3Jane/mandelbrot_v2 written to work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Jess3Jane/mandelbrot_v2/Cargo.toml
[INFO] crate Jess3Jane/mandelbrot_v2 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] checking Jess3Jane/mandelbrot_v2 against try#266783e4e09e4e9d5307c1c8e695659c58bbcac7 for pr-63376
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63376/worker-4/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63376/sources/try#266783e4e09e4e9d5307c1c8e695659c58bbcac7/gh/Jess3Jane/mandelbrot_v2:/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" "+266783e4e09e4e9d5307c1c8e695659c58bbcac7-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] ddedb00377c8a3b17ca2d1faaf2240c2071eddadbce16e95b398e0a2e0f78bd6
[INFO] running `"docker" "start" "-a" "ddedb00377c8a3b17ca2d1faaf2240c2071eddadbce16e95b398e0a2e0f78bd6"`
[INFO] [stderr]     Checking spmc v0.2.2
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking pbr v1.0.1
[INFO] [stderr]    Compiling num-derive v0.2.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking rayon-core v1.4.0
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]     Checking jpeg-decoder v0.1.14
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking fractal v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/util.rs:95:13
[INFO] [stderr]    |
[INFO] [stderr] 95 |         let mut histogram = histograms[id].clone();
[INFO] [stderr]    |             ----^^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:122:13
[INFO] [stderr]     |
[INFO] [stderr] 122 |         let mut row_iter =  iters[y_px as usize].clone();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:148:13
[INFO] [stderr]     |
[INFO] [stderr] 148 |         let mut iter = iters[y as usize].lock().unwrap()[x as usize];
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:284:33
[INFO] [stderr]     |
[INFO] [stderr] 284 |                             let mut iter = image[x as usize + y as usize*ctx.x_px as usize];
[INFO] [stderr]     |                                 ----^^^^
[INFO] [stderr]     |                                 |
[INFO] [stderr]     |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/util.rs:95:13
[INFO] [stderr]    |
[INFO] [stderr] 95 |         let mut histogram = histograms[id].clone();
[INFO] [stderr]    |             ----^^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:122:13
[INFO] [stderr]     |
[INFO] [stderr] 122 |         let mut row_iter =  iters[y_px as usize].clone();
[INFO] [stderr]     |             ----^^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:148:13
[INFO] [stderr]     |
[INFO] [stderr] 148 |         let mut iter = iters[y as usize].lock().unwrap()[x as usize];
[INFO] [stderr]     |             ----^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/util.rs:284:33
[INFO] [stderr]     |
[INFO] [stderr] 284 |                             let mut iter = image[x as usize + y as usize*ctx.x_px as usize];
[INFO] [stderr]     |                                 ----^^^^
[INFO] [stderr]     |                                 |
[INFO] [stderr]     |                                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.38s
[INFO] running `"docker" "inspect" "ddedb00377c8a3b17ca2d1faaf2240c2071eddadbce16e95b398e0a2e0f78bd6"`
[INFO] running `"docker" "rm" "-f" "ddedb00377c8a3b17ca2d1faaf2240c2071eddadbce16e95b398e0a2e0f78bd6"`
[INFO] [stdout] ddedb00377c8a3b17ca2d1faaf2240c2071eddadbce16e95b398e0a2e0f78bd6