[INFO] updating cached repository aschampion/test_image_jpeg
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aschampion/test_image_jpeg
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aschampion/test_image_jpeg" "work/ex/beta-1.38-1/sources/1.37.0/gh/aschampion/test_image_jpeg"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/aschampion/test_image_jpeg'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aschampion/test_image_jpeg" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4c148ea0ea6ce3caaba24205e9f7e1aee214dd59
[INFO] sha for GitHub repo aschampion/test_image_jpeg: 4c148ea0ea6ce3caaba24205e9f7e1aee214dd59
[INFO] validating manifest of aschampion/test_image_jpeg 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 aschampion/test_image_jpeg 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 aschampion/test_image_jpeg
[INFO] finished frobbing aschampion/test_image_jpeg
[INFO] frobbed toml for aschampion/test_image_jpeg written to work/ex/beta-1.38-1/sources/1.37.0/gh/aschampion/test_image_jpeg/Cargo.toml
[INFO] started frobbing aschampion/test_image_jpeg
[INFO] finished frobbing aschampion/test_image_jpeg
[INFO] frobbed toml for aschampion/test_image_jpeg written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg/Cargo.toml
[INFO] crate aschampion/test_image_jpeg 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 aschampion/test_image_jpeg against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 0669c69cedb7d0c14b9b725c6d0cbc51d16d0baba8786c06aafc570a9c7beeec
[INFO] running `"docker" "start" "-a" "0669c69cedb7d0c14b9b725c6d0cbc51d16d0baba8786c06aafc570a9c7beeec"`
[INFO] [stderr]    Compiling num-integer v0.1.36
[INFO] [stderr]    Compiling enum_primitive v0.1.1
[INFO] [stderr]    Compiling rayon-core v1.4.0
[INFO] [stderr]    Compiling num-iter v0.1.35
[INFO] [stderr]    Compiling num-rational v0.1.42
[INFO] [stderr]    Compiling png v0.11.0
[INFO] [stderr]    Compiling rayon v1.0.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.14
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling test_image_jpeg v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |         let mut encoder = image::png::PNGEncoder::new(&mut writer);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 32.42s
[INFO] running `"docker" "inspect" "0669c69cedb7d0c14b9b725c6d0cbc51d16d0baba8786c06aafc570a9c7beeec"`
[INFO] running `"docker" "rm" "-f" "0669c69cedb7d0c14b9b725c6d0cbc51d16d0baba8786c06aafc570a9c7beeec"`
[INFO] [stdout] 0669c69cedb7d0c14b9b725c6d0cbc51d16d0baba8786c06aafc570a9c7beeec
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg:/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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] cd1d8305574433ba6a32b3da6ede7c7ef94ac0a66975f92adfd5840a2de795ee
[INFO] running `"docker" "start" "-a" "cd1d8305574433ba6a32b3da6ede7c7ef94ac0a66975f92adfd5840a2de795ee"`
[INFO] [stderr]    Compiling test_image_jpeg v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |         let mut encoder = image::png::PNGEncoder::new(&mut writer);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.29s
[INFO] running `"docker" "inspect" "cd1d8305574433ba6a32b3da6ede7c7ef94ac0a66975f92adfd5840a2de795ee"`
[INFO] running `"docker" "rm" "-f" "cd1d8305574433ba6a32b3da6ede7c7ef94ac0a66975f92adfd5840a2de795ee"`
[INFO] [stdout] cd1d8305574433ba6a32b3da6ede7c7ef94ac0a66975f92adfd5840a2de795ee
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/aschampion/test_image_jpeg:/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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 34274ae52778b4c30a4ce7e646763a0cef3a991c858c9972850021a3f8b25a28
[INFO] running `"docker" "start" "-a" "34274ae52778b4c30a4ce7e646763a0cef3a991c858c9972850021a3f8b25a28"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.06s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/test_image_jpeg-7ff22dcf7f3d9656
[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] running `"docker" "inspect" "34274ae52778b4c30a4ce7e646763a0cef3a991c858c9972850021a3f8b25a28"`
[INFO] running `"docker" "rm" "-f" "34274ae52778b4c30a4ce7e646763a0cef3a991c858c9972850021a3f8b25a28"`
[INFO] [stdout] 34274ae52778b4c30a4ce7e646763a0cef3a991c858c9972850021a3f8b25a28