[INFO] cloning repository Jess3Jane/mandelbrot_v2
[INFO] running `"git" "clone" "--bare" "git://github.com/Jess3Jane/mandelbrot_v2.git" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Jess3Jane/mandelbrot_v2'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2" "work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/gh/Jess3Jane/mandelbrot_v2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2" "work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/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#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Jess3Jane/mandelbrot_v2 on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-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-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/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-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] building Jess3Jane/mandelbrot_v2 against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 34e6e6c5a9c8bb9c32277e723d46094db42be98e4b190fe58045d4926362e643
[INFO] running `"docker" "start" "-a" "34e6e6c5a9c8bb9c32277e723d46094db42be98e4b190fe58045d4926362e643"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling spmc v0.2.2
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling num-derive v0.2.1
[INFO] [stderr]    Compiling rayon v1.0.1
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.19.0
[INFO] [stderr]    Compiling 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]     Finished dev [unoptimized + debuginfo] target(s) in 26.85s
[INFO] running `"docker" "inspect" "34e6e6c5a9c8bb9c32277e723d46094db42be98e4b190fe58045d4926362e643"`
[INFO] running `"docker" "rm" "-f" "34e6e6c5a9c8bb9c32277e723d46094db42be98e4b190fe58045d4926362e643"`
[INFO] [stdout] 34e6e6c5a9c8bb9c32277e723d46094db42be98e4b190fe58045d4926362e643
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-3/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] d9ca2f595b97007455da7eb149e426f59f79ec94c76f547a4341831d17514ebf
[INFO] running `"docker" "start" "-a" "d9ca2f595b97007455da7eb149e426f59f79ec94c76f547a4341831d17514ebf"`
[INFO] [stderr]    Compiling 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]     Finished dev [unoptimized + debuginfo] target(s) in 1.71s
[INFO] running `"docker" "inspect" "d9ca2f595b97007455da7eb149e426f59f79ec94c76f547a4341831d17514ebf"`
[INFO] running `"docker" "rm" "-f" "d9ca2f595b97007455da7eb149e426f59f79ec94c76f547a4341831d17514ebf"`
[INFO] [stdout] d9ca2f595b97007455da7eb149e426f59f79ec94c76f547a4341831d17514ebf