[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/beta-1.38-1/sources/1.37.0/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Jess3Jane/mandelbrot_v2'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Jess3Jane/mandelbrot_v2" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Jess3Jane/mandelbrot_v2"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Jess3Jane/mandelbrot_v2 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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/beta-1.38-1/sources/1.37.0/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/beta-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Jess3Jane/mandelbrot_v2 against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 23b633fa65d1f16227114f4ed862f2c328eb93315508fcb4e51c49fa1bea00df
[INFO] running `"docker" "start" "-a" "23b633fa65d1f16227114f4ed862f2c328eb93315508fcb4e51c49fa1bea00df"`
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling pbr v1.0.1
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling num-iter v0.1.37
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.12.0
[INFO] [stderr]    Compiling num-derive v0.2.1
[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 29.07s
[INFO] running `"docker" "inspect" "23b633fa65d1f16227114f4ed862f2c328eb93315508fcb4e51c49fa1bea00df"`
[INFO] running `"docker" "rm" "-f" "23b633fa65d1f16227114f4ed862f2c328eb93315508fcb4e51c49fa1bea00df"`
[INFO] [stdout] 23b633fa65d1f16227114f4ed862f2c328eb93315508fcb4e51c49fa1bea00df
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] fdd619f4def6b112f87106489f81bd68590562161f57226225bee5b4a8217f0c
[INFO] running `"docker" "start" "-a" "fdd619f4def6b112f87106489f81bd68590562161f57226225bee5b4a8217f0c"`
[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 1.98s
[INFO] running `"docker" "inspect" "fdd619f4def6b112f87106489f81bd68590562161f57226225bee5b4a8217f0c"`
[INFO] running `"docker" "rm" "-f" "fdd619f4def6b112f87106489f81bd68590562161f57226225bee5b4a8217f0c"`
[INFO] [stdout] fdd619f4def6b112f87106489f81bd68590562161f57226225bee5b4a8217f0c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 16d575777baa8b1a6fd5a34b0b5085c174f80c59302bfe5a9762ff79cae7f14f
[INFO] running `"docker" "start" "-a" "16d575777baa8b1a6fd5a34b0b5085c174f80c59302bfe5a9762ff79cae7f14f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/fractal-a78297d3b9f06a7d
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/fractal-1c89de03f570a559
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests fractal
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/util.rs - util::render_image (line 16) ... FAILED
[INFO] [stdout] test src/util.rs - util::render_image (line 41) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/util.rs - util::render_image (line 16) stdout ----
[INFO] [stdout] error: unexpected close delimiter: `)`
[INFO] [stdout]   --> src/util.rs:32:2
[INFO] [stdout]    |
[INFO] [stdout] 18 | });
[INFO] [stdout]    |  ^ unexpected close delimiter
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/util.rs - util::render_image (line 41) stdout ----
[INFO] [stdout] error: unexpected close delimiter: `)`
[INFO] [stdout]   --> src/util.rs:50:2
[INFO] [stdout]    |
[INFO] [stdout] 11 | });
[INFO] [stdout]    |  ^ unexpected close delimiter
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/util.rs - util::render_image (line 16)
[INFO] [stdout]     src/util.rs - util::render_image (line 41)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `"docker" "inspect" "16d575777baa8b1a6fd5a34b0b5085c174f80c59302bfe5a9762ff79cae7f14f"`
[INFO] running `"docker" "rm" "-f" "16d575777baa8b1a6fd5a34b0b5085c174f80c59302bfe5a9762ff79cae7f14f"`
[INFO] [stdout] 16d575777baa8b1a6fd5a34b0b5085c174f80c59302bfe5a9762ff79cae7f14f